Cycle Syncing and Women’s Health: What the Data Shows
- Aldrin V. Gomes
- 4 days ago
- 5 min read
Cycle syncing has become an increasingly popular wellness trend on social media. Influencers on different platforms, such as TikTok and Instagram, are encouraging women to align their exercise routines, diets, and daily habits with the different phases of their menstrual cycles. Many of those partaking in this trend claim that cycle syncing can improve energy levels, reduce menstrual symptoms, enhance athletic performance, and optimize overall health. As the trend continues to become more popular, many individuals are wondering whether cycle syncing is truly supported by science or is simply another social media phenomenon.
Understanding the Menstrual Cycle
The menstrual cycle (MC) is a monthly process that prepares a woman’s womb for pregnancy. A typical cycle typically lasts about 28 days, although it can vary depending on the individual. This process is regulated by hormones, which are chemical messengers that travel through the blood stream and signal the body to perform specific functions. While many hormones are involved in the MC, the two most important in cycle syncing are estrogen and progesterone. Estrogen helps rebuild the uterine lining after menstruation and can also affect mood, energy levels and how the body uses glucose, which provides energy. Progesterone maintains the uterine lining after ovulation and prepares the body for pregnancy if it were to occur. It can also affect body temperature and contribute to feelings of fatigue or discomfort (Thiyagarajan et al. 2024).
The MC is divided into two distinct phases: the follicular phase and the luteal phase. The follicular phase is the first half of the MC and lasts from menstruation to ovulation. During menstruation, estrogen and progesterone levels are at their lowest but gradually begin to rise as the cycle advances through the follicular phase. Right before ovulation occurs, estrogen levels rises and helps induce the LH surge, triggering an egg to be released from the ovary for possible fertilization. The second half of the MC is the luteal phase, which occurs after ovulation and before menstruation (Handy et al. 2022). During the luteal phase, progesterone becomes the dominant hormone while estrogen levels fluctuate. Some women experience symptoms associated with premenstrual syndrome (PMS), including bloating, breast tenderness, mood changes, and fatigue (Weon & Son 2023). If pregnancy does not occur, both hormone levels drop, causing the uterine lining to shed and the cycle to begin again.
The Science Behind Cycle Syncing
The popularity of cycle syncing is largely based on the idea that hormonal fluctuations throughout the MC can influence physical performance, energy levels, and overall well-being. Research analyzing symptoms across the MC found that during menstruation, women commonly reported more severe symptoms such as cramping, fatigue, headaches and lower energy levels. Because hormone levels are at their lowest during this phase, cycle syncing often recommends using this time for rest and lower-intensity activities. However, research has shown that menstruation itself does not directly weaken muscles or reduce endurance. Instead, exercise tolerance appears to depend more on the severity of symptoms and an individual's personal level of discomfort (Weon & Son 2023). These findings suggest that the menstrual cycle can affect how women feel physically and emotionally throughout the month, its impact on performance may vary from person to person.
These physical and emotional changes are often thought to be linked to the effects of estrogen and progesterone. Estrogen may support muscle recovery, improve the body's ability to utilize glucose (sugar) for energy, and contribute to increased motivation and energy levels. In contrast, progesterone may increase body temperature and feelings of fatigue in some individuals. Because of these hormonal effects, it is reasonable to assume that some women may feel stronger, more energetic, or more motivated during phases of the MC where estrogen levels are higher, such as the follicular and ovulatory phase (Thiyagarajan et al. 2024). Based on this idea, cycle syncing often recommends higher-intensity exercises, such as running or weightlifting, during the follicular phase. While lighter activities like yoga, walking, or stretching are suggested during the luteal phase when progesterone is dominant. Although these recommendations align with the expected effects of hormonal changes, an important question remains: do these hormonal shifts improve or reduce physical performance?
Research suggests that feeling different across the MC is not always the same as performing differently. This distinction is important when evaluating claims made by cycle-synching advocates. Studies examining the relationship between menstrual cycle phases and athletic performance have produced inconsistent results. While many women report feeling stronger or weaker during certain phases of their cycle, scientific studies do not consistently show significant differences in objective images of performance, such as strength, speed, endurance, or power output. In other words, women may perceive changes in their performance, but researchers found no significant evidence to conclude that specific phases reliably make women stronger or weaker (Carmichael et al. 2021).
Social media often presents cycle syncing as a scientifically proven method for improving health, but the evidence behind many of these claims is limited. Many creators across social media platforms promote a variety of benefits, such as balanced hormones, increased energy, improved fertility, and reduced menstrual symptoms, without discussing the lack of scientific evidence surrounding these claims. Researchers concluded that cycle-syncing content on TikTok frequently oversimplifies a complex body of scientific literature and may contribute to misinformation about women’s health (Pfender et al. 2025). A significant issue is that these recommendations often assume all women experience the menstrual cycle in the same way. In reality, it is completely the opposite, menstrual symptoms vary widely between individuals. Some women experience significant changes in mood, energy, and physical comfort, while others experience few noticeable symptoms at all (Weon & Son 2023). This variability suggests that while cycle syncing may be useful for increasing body awareness, its broad claims as a universal health strategy are not fully supported by science.
Conclusion
Cycle syncing is based on real biological processes. Hormones such as estrogen and progesterone naturally fluctuate throughout the menstrual cycle and can influence symptoms, stress levels, mood, and energy. These changes help explain why many women may feel differently at different points in their cycle. However, current research does not provide strong evidence that women should follow strict exercise or dietary plans based solely on menstrual cycle phases. While some women may find it helpful to track their cycles and adjust activities according to how they feel, many of the recommendations promoted on social media are not strongly supported by scientific evidence. Therefore, cycle syncing is not entirely a myth, but it is also not a fully proven health strategy. At present, it is best viewed as a tool for self-awareness rather than a scientifically established method for improving health and performance.
Written by Dania Qasqas and edited by Aldrin V. Gomes, PhD
References
Carmichael, M. A., Thomson, R. L., Moran, L. J., & Wycherley, T. P. (2021a). The Impact of Menstrual Cycle Phase on Athletes’ Performance: A Narrative Review. International Journal of Environmental Research and Public Health, 18(4).
Handy, A. B., Greenfield, S. F., Yonkers, K. A., & Payne, L. A. (2022a). Psychiatric Symptoms Across the Menstrual Cycle in Adult Women: A Comprehensive Review. Harvard Review of Psychiatry, 30(2), 100–117.
Pfender, E., Wanzer, C., Mikkers, L., & Bleakley, A. (2025a). Sync or Swim: Navigating the Tides of Menstrual Cycle Messaging on TikTok. Perspectives on Sexual and Reproductive Health.
Thiyagarajan, D. K., Basit, H., & Jeanmonod, R. (2024a). Physiology, menstrual cycle. National Library of Medicine; StatPearls Publishing.
Weon, H. W., & Son, H. K. (2023a). An Analysis of Menstrual Symptoms, Menstrual Attitudes, Physical Stress and Psychological Stress According to the Menstrual Cycle Phase. Iranian Journal of Public Health, 52(6), 1161–1169.
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