# Circadian Rhythm ❉ Term

**Published:** 2025-06-03
**Author:** Roothea
**Categories:** Term

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![The repetitive arrangement of bamboo stalks, accentuated by light and shadow, creates a visually captivating texture, resonating with the interwoven narrative of heritage. These stalks mirror the strength found in traditional hair care philosophies, reflecting holistic approaches to textured hair health and expressiveness](/wp-content/uploads/2025/05/abstract-bamboo-texture-demonstrating-natural-patterns-of-growth-and.jpg)

## Fundamentals

Across the breadth of existence, from the blossoming of a desert flower to the ebb and flow of ocean tides, an inherent rhythm orchestrates life’s unfolding. This pervasive natural cadence, often unseen yet profoundly felt, finds its echo within every living being, shaping the very fibers of our being. At the core of this intricate choreography lies the biological phenomenon known as the **Circadian Rhythm**, a term derived from the Latin “circa diem,” meaning “around a day.” It represents an intrinsic, approximately 24-hour cycle that governs a myriad of physiological and behavioral processes within living organisms. These internal timekeepers allow bodies to anticipate and adapt to daily environmental changes, particularly the alternating cycles of light and darkness. 

For generations, our ancestors, keenly attuned to the whispers of the natural world, lived in direct synchronicity with these rhythms. Their lives were guided by the sun’s ascent and descent, the moon’s gentle glow, and the changing seasons. Such deep observation and communal wisdom formed the bedrock of daily life, extending naturally to practices of personal care, including the sacred tending of hair. The cyclical nature of day and night, rest and activity, nourishment and regeneration, implicitly informed their understanding of wellness, a knowledge passed down through the ages. 

> The Circadian Rhythm serves as an inner compass, guiding the body’s daily dance with light and shadow, influencing even the tender growth of a single hair strand.
The hair, a living extension of self, participates in this grand cosmic ballet. While we might think of [hair growth](/area/hair-growth/) as a continuous, unceasing process, it too aligns with its own internal timings, a subtle pulse that mirrors the larger rhythms of the body. Understanding this foundational concept opens a portal to appreciating ancestral traditions of [hair care](/area/hair-care/) not merely as aesthetic choices, but as profound, intuitive engagements with natural biological cycles. The earliest known structured approaches to personal care, stretching back to ancient civilizations, reveal a deep reverence for aligning with natural flows. 

![Intricately braiding cornrows, this protective style is a celebration of textured hair](/wp-content/uploads/2025/05/protective-hairstyling-a-child-braids-in-black-and-white-image.jpg)

## What Is a Biological Clock?

The biological clock, a marvel of natural engineering, is not a singular entity but a sophisticated system of molecular mechanisms operating within nearly every cell. At its heart lies the **suprachiasmatic nucleus (SCN)** in the brain, often described as the master clock, receiving signals from the eyes about light and dark. This central orchestrator then transmits cues to peripheral clocks situated in various organs and tissues throughout the body, including the skin and [hair follicles](/area/hair-follicles/) themselves. This layered organization allows for both global coordination and local adaptation to daily fluctuations. 

These cellular clocks are composed of specific genes and proteins that engage in a delicate feedback loop, creating a self-sustaining oscillation. Core clock genes, such as **BMAL1** and **PER1**, are instrumental in this cellular timekeeping. They work in concert, their expression rising and falling over approximately 24 hours, regulating a multitude of cellular activities. This intricate dance of molecular components ensures that physiological processes, from hormone release to cell repair, occur at optimal times of the day. 

![An intricate monochrome array of neem leaves embodies nature](/wp-content/uploads/2025/05/botanical-harmony-monochrome-leaves-arrayed-naturally-for-textured-hair-infusion.jpg)

## Hair’s Own Pace

Just as the body holds a daily rhythm, individual hair follicles possess their own internal timing mechanisms, influencing their growth cycles. Each strand of hair embarks on a multi-phase journey: a period of active growth, a transitional phase, a resting period, and finally, a shedding stage. This entire cycle, which can span several years for a single strand, is profoundly influenced by the overarching circadian system.

The vitality of hair, its resilience, and its very texture are subtly modulated by these daily biological fluctuations. For textured hair, with its unique coiling patterns and distinct structural needs, these subtle timings may hold particular significance.

The cells within the [hair follicle](/area/hair-follicle/) itself exhibit rhythmic activity, responding to the daily ebb and flow of the body’s internal clock. This inherent pace, a quiet pulse within each hair, means that the most effective moments for cleansing, moisturizing, or [protective styling](/area/protective-styling/) might align with the natural rhythms of the hair follicle’s activity. Ancestral wisdom, passed down through generations, often observed these subtle variations in hair’s receptivity, crafting care rituals that honored its living, rhythmic nature. 

![The granular substance evokes ancient beauty traditions, whispering of regenerative scalp masks. Each minute speck carries the potential to rejuvenate roots and promote healthy growth](/wp-content/uploads/2025/05/monochrome-powder-abstract-mineral-rich-earth-clay-for-scalp-treatment.jpg)

![This black and white study of Roselle flowers evokes herbal hair traditions, reflecting a holistic approach to scalp and strand health. It hints at the ancestral practice of using botanicals for care, passed through generations, enhancing beauty rituals steeped in cultural heritage](/wp-content/uploads/2025/05/dried-roselle-flowers-and-leaf-still-life-black-and-white.jpg)

## Intermediate

Moving beyond the foundational understanding, we delve deeper into the nuanced mechanisms that underpin the Circadian Rhythm’s relationship with our very strands. This involves appreciating how the body’s internal chronometer extends its influence to the cellular level of hair follicles, shaping their regeneration and response to care. It is here that the ancient practices, rooted in a holistic view of life and wellbeing, find their scientific resonance, revealing an intuitive alignment with biological imperatives. 

The skin, as the body’s largest organ, hosts its own intricate network of peripheral circadian clocks. These local timekeepers, residing in cells like keratinocytes, melanocytes, and fibroblasts, integrate signals from the master clock with environmental cues. This local chronobiological activity directly impacts a range of skin functions, including barrier integrity, hydration, and cellular repair processes. Given that hair follicles are embedded within the skin, it is logical to recognize that they too are subject to these localized rhythmic influences, further emphasizing the interconnectedness of skin and hair health. 

![Embracing ancestral wisdom, the hands prepare a rice water rinse, a treasured holistic practice for enhancing textured hair](/wp-content/uploads/2025/05/hands-washing-rice-for-textured-hair-rinse-holistic-ancestral-practice.jpg)

## The Inner Architects of Time

At the heart of the cellular circadian system are specific molecular entities: a cluster of clock genes and their corresponding proteins. Two prominent players in this intricate dance are **BMAL1** and **PER1**. These genes, among others, drive the cyclical expression of countless other genes, thereby regulating a vast array of physiological processes. Studies have revealed that these core clock genes are present and actively expressed within human hair follicles, underscoring their direct role in the hair’s life cycle. 

When these clock genes are functioning optimally, they ensure that cellular activities within the hair follicle ❉ such as cell proliferation, protein synthesis, and even the hair’s sensitivity to external factors ❉ occur at their most opportune times throughout the 24-hour day. This finely tuned orchestration translates to more efficient hair growth and overall follicle health. A disruption to this delicate molecular timing can lead to variations in the hair cycle, potentially influencing how quickly hair grows or how susceptible it becomes to environmental stressors. 

![The image captures the deliberate act of adjusting a silk turban, reflecting protective styling](/wp-content/uploads/2025/05/woman-adjusting-silk-turban-protective-style-for-natural-hair-care.jpg)

## Hair Follicle’s Rhythmic Dance

Hair does not grow continuously. Instead, it follows a distinct, multi-phase cycle of regeneration and rest. This cycle is broadly divided into four main stages: 

- **Anagen** ❉ This is the active growth phase, during which hair cells rapidly divide, and the hair shaft lengthens. For scalp hair, this period can last from two to eight years, depending on genetics. Ancestral cultures, observing periods of robust hair growth, might have intuitively recognized the anagen phase’s vitality, leading to practices aimed at encouraging its duration.

- **Catagen** ❉ A brief, transitional phase, typically lasting two to six weeks. During this time, hair growth ceases, and the follicle begins to shrink, detaching from the dermal papilla. This stage represents a crucial shift, a preparation for release.

- **Telogen** ❉ This is the resting phase, lasting approximately two to four months. The hair remains in the follicle, but no active growth occurs. Periods of gentle hair retention might reflect a traditional understanding of this resting stage.

- **Exogen** ❉ The shedding phase, where the old hair strand is released from the follicle, making way for new growth. This marks the culmination of the cycle and the natural removal of hair.
The circadian clock, through its influence on clock genes, subtly modulates the progression of these phases. For instance, research suggests that clock genes like BMAL1 and PER1 play a role in regulating the termination of the anagen (growth) phase. Silencing these genes has been shown to prolong the active hair growth phase.

Moreover, there is evidence that the daily mitotic rhythm, the rate at which cells divide, is coordinated by the circadian clock within the hair matrix cells, leading to variations in hair growth speed throughout the day. Some studies even suggest that hair might grow faster in the morning than in the evening due to this rhythmicity.

![Captured in stark black and white, the boy](/wp-content/uploads/2025/05/striking-portrait-boy-with-half-shaved-spiraled-patterned-hair-black-and-white.jpg)

## Seasonal Shifts and Hair

Beyond the daily cadence, hair also exhibits responses to broader environmental rhythms, such as the changing seasons. Many individuals experience variations in hair shedding throughout the year, with notable increases often observed in late summer and early autumn. While the precise scientific consensus on this “seasonal shedding” remains an area of ongoing study, some theories suggest it is tied to hormonal shifts influenced by changes in daylight hours and temperature. 

This natural phenomenon resonates with the ancestral understanding of living in harmony with nature’s calendar. Traditional [hair care practices](/area/hair-care-practices/) often adapted to seasonal changes, perhaps incorporating richer oils in colder months for moisture retention or lighter herbal rinses during warmer periods to maintain balance. The connection between lunar cycles and hair treatments, still observed in some cultures, further highlights this deep-seated belief in synchronizing personal care with cosmic rhythms.

Some traditions advocate for cutting hair during a new moon for new growth or a waxing moon for vibrant color, reflecting ancient beliefs in harnessing natural energies. These practices underscore a heritage of attunement to external rhythms alongside internal ones.

![The application of an avocado mask embodies a holistic approach to textured hair health, celebrating ancestral practices and emphasizing the importance of moisture retention and scalp health for optimal coil definition and resilience, reflecting a commitment to natural wellness.](/wp-content/uploads/2025/05/woman-applies-natural-avocado-hair-mask-for-textured-hair-wellness.jpg)

![Monochrome rosemary sprigs invite contemplation of natural hair](/wp-content/uploads/2025/05/rosemary-sprigs-still-life-black-and-white-natural-hair-care-ingredient.jpg)

## Academic

The concept of Circadian Rhythm, at its most rigorous academic interpretation, describes an endogenous, self-sustaining biological oscillation, approximately 24 hours in duration, that orchestrates nearly every aspect of an organism’s physiology, metabolism, and behavior. This internal timekeeping system, grounded in molecular feedback loops of specific clock genes and proteins, ensures that biological processes are optimally aligned with the daily cycles of environmental light and darkness. It is a fundamental chronobiological mechanism, a complex temporal architecture that dictates cellular repair, hormone secretion, cell proliferation, and even immune responses, thereby modulating an organism’s overall health and adaptability. 

Beyond the centralized pacemaker in the suprachiasmatic nucleus, peripheral clocks reside in virtually all tissues, including the integumentary system. These peripheral oscillators, while influenced by the master clock, also possess a degree of autonomy, responding directly to local environmental cues such as temperature and nutrient availability. This decentralized, yet interconnected, temporal governance ensures that tissue-specific functions, like the regenerative cycles of hair follicles, operate with precision and efficiency. The rhythmic expression of clock genes like BMAL1, PER1, and CLOCK within hair follicles profoundly influences their cellular dynamics and overall growth trajectory. 

![This stark visual of monochrome wood end grain symbolizes enduring Black hair traditions, where each spiral represents generations of resilience and care the wood](/wp-content/uploads/2025/05/monochrome-end-grain-wood-texture-rings-ancestral-growth-patterns.jpg)

## The Hair Follicle as a Rhythmic Organ

The hair follicle, a dynamic mini-organ, provides a compelling model for understanding peripheral circadian clock activity. Its remarkable capacity for cyclic regeneration, moving through distinct anagen (growth), catagen (regression), and telogen (rest) phases, is intricately modulated by intrinsic molecular rhythms. The daily mitotic rhythm, the rate of cell division, within the [hair matrix cells](/area/hair-matrix-cells/) is synchronized by the local circadian clock. This cellular synchronicity dictates, for instance, that hairs may exhibit differential growth rates across a 24-hour period, a subtle yet significant manifestation of chronobiological control. 

Disruptions to this finely tuned chronobiology within the hair follicle can have discernible consequences. For example, studies involving mutations or silencing of core clock genes such as BMAL1 and PER1 have demonstrated a prolongation of the [anagen phase](/area/anagen-phase/) or a delay in its initiation, suggesting that these genes act as critical regulators in the timing of hair growth. Furthermore, the circadian clock’s influence extends to the hair follicle’s response to external stressors. Given that DNA is most susceptible to damage during cellular mitosis, the circadian gating of mitotic activity may confer a protective mechanism, reducing vulnerability during specific times of the day. 

> The hair follicle embodies a complex chronobiological symphony, its growth phases and cellular rhythms meticulously orchestrated by the body’s intrinsic temporal wisdom.

![The timeless image captures a tender moment of hair care, blending traditional methods with a holistic approach. Nutrient-rich clay nourishes the child](/wp-content/uploads/2025/05/young-woman-applies-clay-hair-mask-to-childs-braided-spirals.jpg)

## Disruption and Resilience: A Heritage Story

The profound connection between the [Circadian Rhythm](/area/circadian-rhythm/) and [textured hair heritage](/area/textured-hair-heritage/) becomes especially poignant when examining the historical and ongoing impacts of systemic stressors on Black and mixed-race communities. The lived experience of racial discrimination, a pervasive and chronic stressor, demonstrably disrupts physiological rhythms, including those integral to hair health. Such sustained adversity can lead to significant psychological and physical health consequences, including dermatological manifestations. Research underscores that [chronic stress](/area/chronic-stress/) activates and prolongs the body’s stress response system, leading to inflammation and hormonal imbalances that can directly compromise hair follicle function. 

A compelling illustration of this intersection is the disproportionate prevalence of conditions such as **Central Centrifugal Cicatricial Alopecia (CCCA)** among women of African descent. While the exact causes of CCCA are still under investigation, it is a scarring alopecia that typically manifests as [hair loss](/area/hair-loss/) at the crown of the head, spreading outwards. The medical literature acknowledges that CCCA predominantly impacts Black women. While direct causal links are still being established, the confluence of genetic predispositions, the unique structural characteristics of afro-textured hair, and the heightened levels of chronic stress from racial discrimination are significant factors. 

Consider the deeply textured legacy of Black women’s hair. Historically, forced hair-shaving during the transatlantic slave trade aimed to dehumanize and strip individuals of their identity, severing a profound cultural and spiritual connection. Hair was, and remains, a potent symbol of family history, social status, spirituality, and tribal identity in many African cultures. The very act of caring for hair was a communal ritual, a bond of sisterhood, a transmission of heritage.

Yet, post-emancipation and throughout the eras of racial segregation, societal pressures often mandated the alteration of natural [Black hair](/area/black-hair/) textures to conform to Eurocentric beauty standards. Nearly 75% of [Black women](/area/black-women/) historically chemically straightened their hair, a practice known to make hair more fragile and susceptible to damage. This constant pressure to “look white” for professional acceptance or social integration is a profound source of chronic psychological stress.

This continuous exposure to discrimination acts as a chronic physiological stressor. When the body is under persistent stress, it produces elevated levels of hormones like cortisol. This sustained hormonal imbalance can disrupt the delicate equilibrium of the hair growth cycle, potentially pushing more follicles into the resting or shedding phases prematurely. Moreover, certain chemicals present in hair products historically marketed to Black women for styling and straightening, such as parabens and phthalates, have been identified as endocrine disruptors.

These substances can interfere with the body’s natural hormone production, potentially exacerbating hormonal imbalances that influence [hair health](/area/hair-health/) and overall well-being. The implications of this are significant, suggesting a pathway through which systemic injustice manifests physically in the hair and scalp.

A study by Lauren Campbell (2021) points to the impact of chronic stress and systemic oppression on Black women’s health, linking it to physiological responses like inflammation that can lead to hair loss, noting that “Black women are subjected to high levels of sexism, racism, and discrimination at levels that are not experienced by White women or Black men. These social conditions create and promote an environment for health inequities and disparities to exist, a disproportionate amount of stress being one of them.” This research underscores how the burden of systemic racism and sexism translates into tangible biological disruptions, affecting the Circadian Rhythm and, consequently, the hair’s vitality. The resilience of textured hair, so often a visible marker of identity, has thus been tested not only by its natural characteristics but by the very forces of societal oppression. 

> Chronic stress, a pervasive legacy of discrimination, disrupts the body’s internal rhythms, including hair health, particularly for Black women.

![The striking black and white portrait emphasizes the elegance of cornrow braids and the power of professional attire, reflecting a fusion of heritage and contemporary poise. The image captures the beauty of textured hair artistry, celebrating ancestral traditions intertwined with modern sophistication and expressive styling](/wp-content/uploads/2025/05/elegant-portrait-of-a-black-woman-featuring-cornrow-braids-and-structured-suit.jpg)

## Ancestral Echoes in Modern Science

Paradoxically, many [ancestral hair care](/area/ancestral-hair-care/) practices, born from necessity and a deep connection to nature, offer pathways that inherently support the hair’s natural rhythms. These traditions, passed down through oral histories and communal rituals, often involved consistent, gentle handling, natural ingredients, and protective styling. 

Consider the consistent practice of scalp oiling, a ritual prevalent across diverse African and diasporic cultures. Ancient Egyptians, for instance, used oils like olive oil, castor oil, and honey for their nourishing properties. This practice, often performed in the evening, would align with the skin’s nocturnal repair processes and the circadian rhythm of the hair follicle’s cells.

At night, the [skin barrier function](/area/skin-barrier-function/) may be more permeable and cellular repair mechanisms are heightened, making it an optimal time for deep nourishment. This provides a scientific rationale for a practice that has been intuitively understood for centuries: the night offers a potent window for rejuvenation.

The art of protective styling ❉ braids, twists, and wraps ❉ common across African hair heritage, also offers a buffer against daily environmental stressors and mechanical damage. These styles, often meticulously crafted during communal gatherings, allowed hair to rest from constant manipulation, preserving its length and strength. Such practices, by reducing daily friction and exposure, indirectly support the hair follicle’s natural cycles, allowing it to function without constant disruption. The rhythmic application of natural ingredients, the consistent detangling with wide-toothed combs, and the deliberate resting periods for hair, all speak to an implicit understanding of hair as a living, cyclical entity, one that thrives when nurtured in alignment with its intrinsic pace. 

The historical record, while not explicitly detailing “circadian rhythm” in ancient texts, reveals a profound, experiential knowledge of temporal alignment. The careful selection of times for hair treatments, often linked to lunar cycles or specific times of day, suggests an intuitive grasp of energetic and physiological flows. This ancestral wisdom, now illuminated by chronobiological science, validates the power of living in harmony with our body’s inherent rhythms, ensuring not just cosmetic beauty but holistic well-being for our textured crowns. 

![Bathed in gentle light, this thoughtful portrait embodies quiet strength, showcasing elegant box braids. The moment of self-reflection underscores ancestral connections intertwined with contemporary self-expression through textured hair formation, enhanced by her personal style, celebrating Black womanhood](/wp-content/uploads/2025/05/contemplative-portrait-of-black-woman-with-braided-hair-near-window.jpg)

![Under dappled sunlight, the stylist](/wp-content/uploads/2025/05/woman-receiving-protective-hairstyle-braids-underneath-sunlight-detailed-black.jpg)

## Reflection on the Heritage of Circadian Rhythm

Our exploration of the Circadian Rhythm, particularly through the lens of [textured hair](/area/textured-hair/) heritage, deepens our appreciation for the profound connection between biological science, cultural wisdom, and personal well-being. It becomes clear that the rhythms beating within our bodies, the daily cycles of regeneration and rest, are not isolated biological phenomena. Instead, they are inextricably linked to the ways our ancestors lived, loved, and cared for their crowning glories. The practices passed down through generations, often dismissed as mere folk remedies, reveal a sophisticated, intuitive understanding of living in harmony with nature’s grand design. 

The textured hair strand, a living archive of identity and resilience, carries within its very structure the echoes of ancient rhythms and the imprints of historical journeys. From the sacred rituals of ancient African civilizations, where hair symbolized a conduit to the divine and a marker of social standing, to the enduring strength found in protective styles woven in the face of adversity, hair has always been more than mere aesthetics. It is a symbol of profound cultural memory, a testament to endurance, and a canvas for self-expression. 

Understanding the Circadian Rhythm in this context allows us to approach textured hair care not as a series of disconnected steps, but as a holistic conversation with our own biology and our ancestral lineage. It invites us to reconnect with the wisdom that understood the optimal times for nourishment, for rest, for protection, and for celebration. This knowledge empowers us to create care rituals that are not only scientifically informed but also deeply resonant with our heritage, transforming routine into a sacred practice of self-reverence.

The journey of the Circadian Rhythm, from the elemental biology of early life to its role in shaping futures, finds its truest voice in the continued care and honoring of textured hair. This legacy of care, a tender thread stretching across time, binds us to those who came before, reminding us that true beauty blossoms from a harmony of inner and outer worlds, always rooted in the richness of our shared human story.

![This textural display of rice, a staple ingredient, invokes notions of purity, mirroring the search for natural and authentic ingredients suitable for the health and vitality of textured hair, honoring ancestral practices and nurturing holistic well-being for future generations.](/wp-content/uploads/2025/05/basmati-rice-grains-textural-portrait-symbolizing-purity-and-textured-hair.jpg)

![United by shared tradition, women collectively grind spices using time-honored tools, linking their heritage and labor to ancestral methods of preparing remedies, foods and enriching hair care preparations. This visual narrative evokes generational wellness, holistic care, and hair health practices rooted in community and ancestral knowledge](/wp-content/uploads/2025/05/women-united-in-traditional-african-spice-grinding-ritual-black-and-white.jpg)

## References

- Courtois, M. Loussouarn, G. Hourseau, C. & Grollier, J. F. (1995). Periodicity in the growth and shedding of hair. <i>British Journal of Dermatology, 132_(2), 146-148.

- Gaddameedhi, H. et al. (2013). Local circadian clock gates cell cycle progression of transient amplifying cells during regenerative hair cycling. _Proceedings of the National Academy of Sciences, 110_(22), E2094-E2103.

- Geyfman, M. et al. (2013). Circadian clock genes contribute to the regulation of hair follicle cycling. _PLoS Genetics, 9_(5), e1003463.

- Hardman, A. (2021). Stress Induced Hair Loss? Black Women Are Among the Most Vulnerable. _Modern Salon._

- Lin, K. K. et al. (2013). Local circadian clock gates cell cycle progression of transient amplifying cells during regenerative hair cycling. _Proceedings of the National Academy of Sciences, 110_(22), E2094-E2103.

- Mbodj, M. (2020). The significance of hair in African culture. _Okan Africa Blog._

- Ogunseye, L. et al. (2021). Hormonal activity in commonly used Black hair care products: evaluating hormone disruption as a plausible contribution to health disparities. _Environmental Science & Technology, 55_(11), 7622-7631.

- Ohnemus, U. et al. (2017). How Does the Circadian Rhythm Affect Hair Growth? _LearnSkin._

- Okoro, N. J. & Johnson, N. (2022). Sis, It’s Not You, It’s Life: Stress and Hair Loss. _PsychoHairapy._

- Picardo, M. et al. (2019). Circadian Rhythm and the Skin: A Review of the Literature. _Journal of Clinical & Aesthetic Dermatology, 12_(9), 30-36.

- Qi, X. et al. (2024). Circadian Rhythms of Skin Surface Lipids and Physiological Parameters in Healthy Chinese Women Reveals Circadian Changes in Skin Barrier Function. _International Journal of Molecular Sciences, 25_(1), 143.

- Saitoh, M. Uzuka, M. & Sakamoto, M. (1970). Human Hair Cycle. _The Journal of Investigative Dermatology, 54_(1), 65-81.

- Tharps, L. M. & Byrd, A. D. (2014). _Hair Story: Untangling the Roots of Black Hair in America._ St. Martin’s Press.

- Tanioka, M. et al. (2009). The hair eclipse phenomenon: sharpening the focus on the hair cycle chronobiology. _British Journal of Dermatology, 161_(1), 1-5.

- Wang, S. (2023). Overview of the Circadian Clock in the Hair Follicle Cycle. _International Journal of Molecular Sciences, 24_(13), 10839.

## Glossary

### [Skin Barrier Function](https://roothea.co/area/skin-barrier-function/)

Meaning ❉ Skin Barrier Function points to the scalp's quiet yet diligent outer layer, a crucial interface designed to hold precious moisture within and guard against external influences that might unsettle the scalp's calm.

### [Hair Cycle Phases](https://roothea.co/area/hair-cycle-phases/)

Meaning ❉ The Hair Cycle Phases describe the gentle progression each individual strand undertakes: anagen, the period of vibrant cellular

### [Ancestral Hair Care](https://roothea.co/area/ancestral-hair-care/)

Meaning ❉ Ancestral Hair Care describes the thoughtful reception and contemporary application of time-honored practices and deep understanding concerning Black and mixed-race textured hair, passed through generations.

### [Anagen Phase](https://roothea.co/area/anagen-phase/)

Meaning ❉ Anagen Phase represents the vibrant, active growth period for each strand, a foundational moment in the life cycle of textured hair.

### [Protective Styling](https://roothea.co/area/protective-styling/)

Meaning ❉ Protective Styling defines a mindful approach to hair care, particularly for textured, Black, and mixed-race hair, involving styles that thoughtfully shield strands from daily manipulation and environmental elements.

### [Black Women](https://roothea.co/area/black-women/)

Meaning ❉ Black women, as central figures in textured hair understanding, gently guide the comprehension of coily and kinky strands.

### [Hair Care Practices](https://roothea.co/area/hair-care-practices/)

Meaning ❉ Hair Care Practices, within the delicate realm of textured hair, denote the considered approaches and consistent applications individuals gently employ to support the inherent well-being and distinct patterns of their coils, curls, and waves.

### [Holistic Wellness](https://roothea.co/area/holistic-wellness/)

Meaning ❉ Holistic Wellness, within the context of textured hair, denotes a comprehensive approach to hair vitality extending beyond superficial product application.

### [Cultural Heritage](https://roothea.co/area/cultural-heritage/)

Meaning ❉ Cultural Heritage, within the context of textured hair, represents the accumulated wisdom, practices, and perspectives passed through generations within Black and mixed-race communities concerning hair health, appearance, and social significance.

### [Hair Follicles](https://roothea.co/area/hair-follicles/)

Meaning ❉ Hair Follicles signify the tender, foundational dwellings situated beneath the scalp's surface, acting as the primary biological compass for every unique strand of textured hair.

## Explore Your Heritage

### [Circadian Hair Rhythms](https://roothea.co/term/circadian-hair-rhythms/)
![This monochromatic image exudes serene strength and grace, highlighting the beauty of natural coiled hair. The woman](https://roothea.co/wp-content/uploads/2025/05/striking-monochromatic-portrait-of-a-young-woman-with-natural-coiled-hair.jpg)

### [Circadian Rhythms](https://roothea.co/term/circadian-rhythms/)
![The application of clay to textured hair braids evokes ancestral traditions, symbolizing a connection to heritage and holistic hair wellness practices. This intimate moment emphasizes the care invested in maintaining strong, culturally significant hair formations and scalp health with natural ingredients.](https://roothea.co/wp-content/uploads/2025/05/clay-mask-applied-to-braided-textured-hair-a-heritage-ritual.jpg)

### [Circadian Biology](https://roothea.co/term/circadian-biology/)
![An evocative glimpse into ancestral wisdom, the woman](https://roothea.co/wp-content/uploads/2025/05/woman-grinding-herbs-ancestral-hair-care-ritual-textured-hair-wellness.jpg)

### [Circadian Rhythm Hair](https://roothea.co/term/circadian-rhythm-hair/)
![Bathed in contrasting light, the subject](https://roothea.co/wp-content/uploads/2025/05/monochrome-portrait-of-woman-with-coiled-hair-and-radiant-skin.jpg)

### [Circadian Hair Cycle](https://roothea.co/term/circadian-hair-cycle/)
![The focused examination of spiraled textured hair in this image evokes the deep connection between self-care, heritage, and the deliberate art of nurturing ancestral hair patterns emphasizing the importance of thoughtful hair practices and highlighting the inherent beauty found within textured hair.](https://roothea.co/wp-content/uploads/2025/05/womans-hands-examining-twisted-strands-black-textured-hair-against-neutral.jpg)

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    "datePublished": "2025-06-03T17:56:13+08:00",
    "dateModified": "2026-01-07T10:33:33+08:00",
    "publisher": {
        "@type": "Organization",
        "name": "Roothea"
    },
    "articleSection": [
        "Term"
    ],
    "image": {
        "@type": "ImageObject",
        "url": "https://roothea.co/wp-content/uploads/2025/05/generational-weaving-an-elders-hands-instructing-younger-hands-on-indigenous.jpg",
        "caption": "Hands intertwined, an elder passes ancestral skills weaving intricate patterns, textured with the rich history of indigenous knowledge. A potent image reflecting dedication to cultural continuity, holistic care, and the preservation of ancestral practices including natural hair maintenance techniques."
    }
}
```

```json
{
    "@context": "https://schema.org",
    "@type": "FAQPage",
    "mainEntity": [
        {
            "@type": "Question",
            "name": "What is a Biological Clock?",
            "acceptedAnswer": {
                "@type": "Answer",
                "text": " The biological clock, a marvel of natural engineering, is not a singular entity but a sophisticated system of molecular mechanisms operating within nearly every cell. At its heart lies the suprachiasmatic nucleus (SCN) in the brain, often described as the master clock, receiving signals from the eyes about light and dark. This central orchestrator then transmits cues to peripheral clocks situated in various organs and tissues throughout the body, including the skin and hair follicles themselves. This layered organization allows for both global coordination and local adaptation to daily fluctuations. "
            }
        }
    ]
}
```

```json
{
    "@context": "https://schema.org",
    "@type": "WebPage",
    "@id": "https://roothea.co/term/circadian-rhythm/",
    "mentions": [
        {
            "@type": "DefinedTerm",
            "@id": "https://roothea.co/area/hair-growth/",
            "name": "Hair Growth",
            "url": "https://roothea.co/area/hair-growth/",
            "description": "Meaning ❉ Hair Growth, for those with distinct coils, curls, and waves, denotes the gentle biological cycle where new cellular structures emerge from the scalp's follicular depths, gradually extending each unique strand."
        },
        {
            "@type": "DefinedTerm",
            "@id": "https://roothea.co/area/hair-care/",
            "name": "Hair Care",
            "url": "https://roothea.co/area/hair-care/",
            "description": "Meaning ❉ Hair Care, when understood through the lens of textured hair, signifies a mindful discipline for preserving the vigor of coily, kinky, and wavy strands."
        },
        {
            "@type": "DefinedTerm",
            "@id": "https://roothea.co/area/hair-follicles/",
            "name": "Hair Follicles",
            "url": "https://roothea.co/area/hair-follicles/",
            "description": "Meaning ❉ Hair Follicles signify the tender, foundational dwellings situated beneath the scalp's surface, acting as the primary biological compass for every unique strand of textured hair."
        },
        {
            "@type": "DefinedTerm",
            "@id": "https://roothea.co/area/protective-styling/",
            "name": "Protective Styling",
            "url": "https://roothea.co/area/protective-styling/",
            "description": "Meaning ❉ Protective Styling defines a mindful approach to hair care, particularly for textured, Black, and mixed-race hair, involving styles that thoughtfully shield strands from daily manipulation and environmental elements."
        },
        {
            "@type": "DefinedTerm",
            "@id": "https://roothea.co/area/hair-follicle/",
            "name": "Hair Follicle",
            "url": "https://roothea.co/area/hair-follicle/",
            "description": "Meaning ❉ The hair follicle, a delicate dermal pocket nestled within the scalp, serves as the singular point where each individual hair fiber begins its growth."
        },
        {
            "@type": "DefinedTerm",
            "@id": "https://roothea.co/area/hair-care-practices/",
            "name": "Hair Care Practices",
            "url": "https://roothea.co/area/hair-care-practices/",
            "description": "Meaning ❉ Hair Care Practices, within the delicate realm of textured hair, denote the considered approaches and consistent applications individuals gently employ to support the inherent well-being and distinct patterns of their coils, curls, and waves."
        },
        {
            "@type": "DefinedTerm",
            "@id": "https://roothea.co/area/hair-matrix-cells/",
            "name": "Hair Matrix Cells",
            "url": "https://roothea.co/area/hair-matrix-cells/",
            "description": "Meaning ❉ Hair Matrix Cells represent the foundational cellular activity nestled within the hair bulb, acting as the dynamic origin point for each individual strand."
        },
        {
            "@type": "DefinedTerm",
            "@id": "https://roothea.co/area/anagen-phase/",
            "name": "Anagen Phase",
            "url": "https://roothea.co/area/anagen-phase/",
            "description": "Meaning ❉ Anagen Phase represents the vibrant, active growth period for each strand, a foundational moment in the life cycle of textured hair."
        },
        {
            "@type": "DefinedTerm",
            "@id": "https://roothea.co/area/textured-hair-heritage/",
            "name": "Textured Hair Heritage",
            "url": "https://roothea.co/area/textured-hair-heritage/",
            "description": "Meaning ❉ \"Textured Hair Heritage\" denotes the deep-seated, historically transmitted understanding and practices specific to hair exhibiting coil, kink, and wave patterns, particularly within Black and mixed-race ancestries."
        },
        {
            "@type": "DefinedTerm",
            "@id": "https://roothea.co/area/circadian-rhythm/",
            "name": "Circadian Rhythm",
            "url": "https://roothea.co/area/circadian-rhythm/",
            "description": "Meaning ❉ Circadian Rhythm, for those tending to textured crowns, gently speaks to the body's inherent twenty-four-hour cycle, a quiet internal cadence that orchestrates biological processes, including the subtle workings of hair follicle activity and scalp regeneration."
        },
        {
            "@type": "DefinedTerm",
            "@id": "https://roothea.co/area/chronic-stress/",
            "name": "Chronic Stress",
            "url": "https://roothea.co/area/chronic-stress/",
            "description": "Meaning ❉ Chronic stress, in the realm of textured hair well-being, refers to the sustained physiological and emotional strain that subtly, yet persistently, influences the scalp environment and hair fiber integrity."
        },
        {
            "@type": "DefinedTerm",
            "@id": "https://roothea.co/area/hair-loss/",
            "name": "Hair Loss",
            "url": "https://roothea.co/area/hair-loss/",
            "description": "Meaning ❉ Hair loss, for the textured hair community, is the gentle signal that the delicate ecosystem of your scalp and strands may be asking for a mindful adjustment."
        },
        {
            "@type": "DefinedTerm",
            "@id": "https://roothea.co/area/black-women/",
            "name": "Black Women",
            "url": "https://roothea.co/area/black-women/",
            "description": "Meaning ❉ Black women, as central figures in textured hair understanding, gently guide the comprehension of coily and kinky strands."
        },
        {
            "@type": "DefinedTerm",
            "@id": "https://roothea.co/area/black-hair/",
            "name": "Black Hair",
            "url": "https://roothea.co/area/black-hair/",
            "description": "Meaning ❉ Black Hair describes the spectrum of hair textures primarily found within communities of African heritage, recognized by its distinct curl patterns ❉ from expansive waves to tightly coiled formations ❉ and an often elliptical follicle shape, which fundamentally shapes its unique growth trajectory."
        },
        {
            "@type": "DefinedTerm",
            "@id": "https://roothea.co/area/hair-health/",
            "name": "Hair Health",
            "url": "https://roothea.co/area/hair-health/",
            "description": "Meaning ❉ Hair Health, for textured strands, denotes a state of optimal scalp vitality and fiber integrity, where each coil and kink displays balanced hydration and intrinsic resilience."
        },
        {
            "@type": "DefinedTerm",
            "@id": "https://roothea.co/area/ancestral-hair-care/",
            "name": "Ancestral Hair Care",
            "url": "https://roothea.co/area/ancestral-hair-care/",
            "description": "Meaning ❉ Ancestral Hair Care describes the thoughtful reception and contemporary application of time-honored practices and deep understanding concerning Black and mixed-race textured hair, passed through generations."
        },
        {
            "@type": "DefinedTerm",
            "@id": "https://roothea.co/area/skin-barrier-function/",
            "name": "Skin Barrier Function",
            "url": "https://roothea.co/area/skin-barrier-function/",
            "description": "Meaning ❉ Skin Barrier Function points to the scalp's quiet yet diligent outer layer, a crucial interface designed to hold precious moisture within and guard against external influences that might unsettle the scalp's calm."
        },
        {
            "@type": "DefinedTerm",
            "@id": "https://roothea.co/area/textured-hair/",
            "name": "Textured Hair",
            "url": "https://roothea.co/area/textured-hair/",
            "description": "Meaning ❉ Textured hair describes the natural hair structure characterized by its unique curl patterns, ranging from expansive waves to closely wound coils, a common trait across individuals of Black and mixed heritage."
        },
        {
            "@type": "DefinedTerm",
            "@id": "https://roothea.co/area/hair-cycle-phases/",
            "name": "Hair Cycle Phases",
            "url": "https://roothea.co/area/hair-cycle-phases/",
            "description": "Meaning ❉ The Hair Cycle Phases describe the gentle progression each individual strand undertakes: anagen, the period of vibrant cellular"
        },
        {
            "@type": "DefinedTerm",
            "@id": "https://roothea.co/area/holistic-wellness/",
            "name": "Holistic Wellness",
            "url": "https://roothea.co/area/holistic-wellness/",
            "description": "Meaning ❉ Holistic Wellness, within the context of textured hair, denotes a comprehensive approach to hair vitality extending beyond superficial product application."
        },
        {
            "@type": "DefinedTerm",
            "@id": "https://roothea.co/area/cultural-heritage/",
            "name": "Cultural Heritage",
            "url": "https://roothea.co/area/cultural-heritage/",
            "description": "Meaning ❉ Cultural Heritage, within the context of textured hair, represents the accumulated wisdom, practices, and perspectives passed through generations within Black and mixed-race communities concerning hair health, appearance, and social significance."
        }
    ]
}
```


---

**Original URL:** https://roothea.co/term/circadian-rhythm/
