Laboratory of Physical Education Research (LAPEF), University City of Sao Paulo (UNICID), Sao Paulo 05508-030, Brazil.
Pediatric Cardiology Group, Departament of Pediatrics and Childcare of Irmandade da Santa Casa de Misericórdia de São Paulo (ISCMSP), Sao Paulo 01221-010, Brazil.
Int J Environ Res Public Health. 2023 Feb 10;20(4):3148. doi: 10.3390/ijerph20043148.
Women of childbearing age have variations in substrate oxidation rates that can lead to overweight, type II diabetes, and other conditions that may be associated with metabolic inflexibility and the variations in estrogen concentrations observed during the monthly ovarian cycle.
This study aimed to verify and compare the influence of eight treadmill high-intensity interval training (HIT) sessions on carbohydrate and lipid oxidation rates (CHOox and LIPox, respectively) and intensities of ventilatory anaerobic thresholds (VATs) of women in different phases of the monthly ovarian cycle.
Eleven irregularly active women performed incremental treadmill exercise testing followed by submaximal work-rate running for 45 min to determine VATs, VO, peak velocity (V), and substrate oxidation rates, before and after a training period, in different phases of their monthly ovarian cycle (follicular phase group, FL, = 6; luteal phase group, LT, = 5). The training period consisted of eight HIT sessions, composed each one of eight sets of 60 s running at 100%V interspersed by 75 s recovery every 48 h.
Our results showed no significant differences in VATs intensities between groups. The comparison between groups showed significant differences in relative energy derived from CHO pre- and post-training of -61.42% and -59.26%, respectively, and LIP pre- and post-training of 27.46% and 34.41%, respectively. The relative energy derived from CHO after the training period was 18.89% and 25.50% higher for FL and LT, respectively; consequently, the relative energy derived from LIPox after the training period was 8,45% and 3.46% lower for FL and LT, respectively. Over the training period, V was ~13.5 km/h, which produced the relative intensities of ~89%VO e ~93%HR for both groups.
The monthly ovarian cycle phases promote significant changes in substrate oxidation rates leading to a decrease in CHOox. High-intensity interval training can minimize the differences observed and constitute an alternative intervention.
本研究旨在验证和比较 8 次跑步机高强度间歇训练（HIT）对不同月经周期阶段女性的碳水化合物和脂肪氧化率（CHOox 和 LIPox）和呼吸无氧阈值（VAT）强度的影响。
11 名不规律运动的女性进行递增式跑步机运动测试，然后进行 45 分钟的亚最大工作速率跑步，以确定 VATs、VO2 峰值速度（V）和底物氧化率，然后在月经周期的不同阶段（卵泡期组，FL，n = 6；黄体期组，LT，n = 5）进行训练前后。训练期包括 8 次 HIT 课程，每个课程由 8 组 60 秒的 100%V 跑步组成，间隔 75 秒恢复，每 48 小时进行一次。
我们的结果显示，两组之间的 VATs 强度没有显著差异。组间比较显示，训练前后相对能量中 CHO 的比例分别为-61.42%和-59.26%，LIP 的比例分别为 27.46%和 34.41%，差异有统计学意义。训练后，FL 和 LT 分别有 18.89%和 25.50%的 CHO 相对能量增加；相应地，LT 和 FL 的 LIPox 相对能量在训练后分别降低了 8.45%和 3.46%。在训练期间，V 约为 13.5km/h，产生了两组相对强度约为 89%VO2 和 93%HR。
月经周期阶段会导致底物氧化率发生显著变化，导致 CHOox 减少。高强度间歇训练可以最小化观察到的差异，是一种替代干预措施。
