Trial reportEuropean journal of applied physiology2026
The effects of menstrual cycle phase on acute critical power testing performance in healthy females.
Trial report in European journal of applied physiology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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7 authors.
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Abstract
aimCritical power (CP) is derived from the hyperbolic relationship between power output and time to exhaustion (TTE) and delineates severe-intensity exercise from the heavy-intensity domain. Fluctuations in endogenous and exogenous female sex hormones may influence this power-duration relationship. PURPOSE: This study examined CP and subjective fatigue between low-hormonal (LHP) and high-hormonal (HHP) phases of the menstrual cycle (MC) in eumenorrheic (EUM), intrauterine device (IUD), and oral contraceptive (OC) using females.
methodsThirty-five participants (mean ± SD: age: 24.3 ± 6.1 yrs, weight: 65.2 ± 7.0 kg) completed a randomized crossover design. Performance outcomes (CP [W], anaerobic work capacity [W´; J], TTE [sec], and total work [J]) were evaluated from three TTE trials at 110%, 80%, and 95% of peak oxygen consumption. Subjective feelings of fatigue, sleepiness, consciousness, and energy were obtained from validated questionnaires.
resultsCP (LHP-HHP; Δ ± SE: 0.81 ± 1.87 W), W´ (Δ -295.44 ± 415.04 J), TTE (Δ: 110%: -7.98 ± 6.16 s; 95%: 1.21 ± 9.44 s; 80%: - 52.63 ± 25.80 s), total work (Δ: - 8,022 ± 4,590 J), and energy (Δ: - 1.69 ± 8.45 a.u) were not significantly different between MC phases. Greater subjective fatigue (LHP-HHP; Δ: - 5.69 ± 12.08 a.u; p = 0.009), sleepiness (Δ: - 3.34 ± 9.70 a.u; p = 0.049), and consciousness (Δ: - 0.86 ± 2.1 a.u; p = 0.024) were identified in HHP.
conclusionThese data suggest that MC phase does not alter parameters of the power-duration relationship in recreationally active females, but subjective feelings of fatigue may be altered during the high-hormone phase of the MC.
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