Graduate School of Health and Sport Science, Nippon Sport Science University, Tokyo, Japan -
Department of Sport Science and Research, Japan Institute of Sports Sciences, Tokyo, Japan.
J Sports Med Phys Fitness. 2023 Nov;63(11):1165-1174. doi: 10.23736/S0022-4707.23.15209-1. Epub 2023 Sep 15.
Low-volume high-intensity interval training (HIIT) for weight loss has become prevalent in recent years, with increased excess post-exercise oxygen consumption (EPOC) as the mechanism. However, the influence of the menstrual cycle on EPOC and fat oxidation following low-volume HIIT is unclear. This study aimed to investigate the effect of the menstrual cycle on the increase in EPOC and fat oxidation after low-volume HIIT.
Twelve eumenorrheic women participated during their early follicular and luteal phases. On each experimental day, they performed low-volume HIIT comprising fifteen repeated 8 s sprint cycling tests with 12 s rests, for 5 min. Expired gas samples were collected before and every 60 min until 180 min post-exercise. EPOC was defined as the increase in oxygen consumption from the resting state, and the total EPOC and fat oxidation were calculated from the total time of each measurement. Blood samples for serum estradiol, progesterone, free fatty acids, blood glucose, lactate, and plasma noradrenaline were collected and assessed before immediately after, and at 180 min post-exercise and were assessed.
Serum estradiol and progesterone were significantly higher in the luteal phase than the follicular phase (P<0.01 for both). No significant differences in total EPOC and fat oxidation were found between the menstrual phases. Serum free fatty acid, blood glucose, lactate, and plasma noradrenaline concentrations were not affected by the menstrual cycle.
These results suggest that the menstrual cycle does not affect the increase in EPOC or fat oxidation after low-volume HIIT.
近年来，低容量高强度间歇训练（HIIT）作为一种减肥方法越来越流行，其机制是增加运动后过量耗氧量（EPOC）。然而，低容量 HIIT 后月经周期对 EPOC 和脂肪氧化的影响尚不清楚。本研究旨在探讨月经周期对低容量 HIIT 后 EPOC 和脂肪氧化增加的影响。
12 名月经规律的女性分别在卵泡早期和黄体期参加实验。在每个实验日，她们进行 5 分钟的低容量 HIIT，包括 15 次重复 8 秒的冲刺自行车测试，每次休息 12 秒。在运动前和运动后每 60 分钟收集一次呼出气体样本，直到 180 分钟。EPOC 定义为从静息状态到运动状态的氧耗量增加，从每个测量的总时间计算总 EPOC 和脂肪氧化。在运动前、运动后即刻和 180 分钟采集血清雌二醇、孕酮、游离脂肪酸、血糖、乳酸和血浆去甲肾上腺素，并进行评估。
黄体期血清雌二醇和孕酮明显高于卵泡期（均 P<0.01）。月经周期对总 EPOC 和脂肪氧化无显著影响。血清游离脂肪酸、血糖、乳酸和血浆去甲肾上腺素浓度不受月经周期影响。
这些结果表明，月经周期不会影响低容量 HIIT 后 EPOC 或脂肪氧化的增加。
