Heart Rate Acquisition and Threshold-Based Training Increases Oxygen Uptake at Metabolic Threshold in Triathletes: A Pilot Study
Heart Rate Acquisition and Threshold-Based Training Increases Oxygen Uptake at Metabolic Threshold in Triathletes: A Pilot Study
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心率采集和基于阈值的训练可增加铁人三项运动员代谢阈值的摄氧量：一项试点研究
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发表时间：
2019
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通讯作者：
Christopher B. Cooper
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作者：
Eric V. Neufeld;Jeremy Wadowski;D. Boland;B. Dolezal;Christopher B. Cooper
运动强度是运动处方模型的重要组成部分。然而，目前采用各种非特定运动强度方案的研究报告称，训练后最大摄氧量 (VO2max) 改善存在很大差异，这表明目前对于最大运动表现的最佳心率 (fC) 训练区域缺乏共识。本研究考察了代谢 (VO2θ) 和通气阈值 (VEθ) 之间的训练时间百分比 (%time) 之间的关系，以及由此产生的有氧表现标记的变化。招募了 13 名（6 名男性）大学俱乐部级铁人三项运动员，在所有跑步和自行车训练期间进行为期八周的远程 fC 监测。参与者佩戴前臂佩戴的光学 fC 传感器，与收集和存储 fC 的智能手机配对。根据 VO2θ 和 VEθ 之间的训练时间百分比，将受试者分为低组和高组。八周后，两组的相对 VO2max（P = 0.007，g = 0.48）、VO2θ（P = 0.018，g = 0.35）和 VEθ（P = 0.030，g = 0.29）均较基线显着增加。不包括零的 95% 自举置信区间 (−0.38, −0.03; g = 1.26) 显示，高组 (0.37 ± 0.15 L/min) 与低组 (0.17 ± 0.14 L/min) 相比，VO2θ 变化较大且显着更大。组间其他变量没有观察到显着差异。增加铁人三项运动员在 VO2θ 和 VEθ 之间锻炼的时间百分比可能会优化八周训练后 VO2θ 的增加。
Exercise intensity is a critical component of the exercise prescription model. However, current research employing various non-specific exercise intensity protocols have reported wide variability in maximum oxygen uptake (VO2max) improvement after training, suggesting a present lack of consensus regarding optimal heart rate (fC) training zones for maximal athletic performance. This study examined the relationship between percentage of time (%time) spent training between the metabolic (VO2θ) and ventilatory thresholds (VEθ), and the resultant change in markers of aerobic performance. Thirteen (6 males) collegiate club-level triathletes were recruited for eight weeks of remote fC monitoring during all running and cycling sessions. Participants donned a forearm-worn optical fC sensor paired to a smartphone that collected and stored fCs. Subjects were categorized into Low and High groups based on %time spent training between the VO2θ and VEθ. Significant increases were observed in relative VO2max (P = 0.007, g = 0.48), VO2θ (P = 0.018, g = 0.35), and VEθ (P = 0.030, g = 0.29) from baseline after eight weeks for both groups. A 95% bootstrapped confidence interval that did not include zero (−0.38, −0.03; g = 1.26) revealed a large and significantly greater change in VO2θ in the High group (0.37 ± 0.15 L/min) versus the Low group (0.17 ± 0.14 L/min). No significant differences were observed in other variables between groups. Increasing triathletes’ %time spent exercising between VO2θ and VEθ may optimize increases in VO2θ after eight weeks of training.