Lee David K, Maltz Natalie A, Becker James, Cotter Joshua A
Department of Kinesiology, Physiology of Exercise and Sport (PEXS) Laboratory, California State University, Long Beach, Long Beach, CA, USA.
Department of Health and Human Development, Montana State University, Bozeman, MT, USA.
Int J Exerc Sci. 2021 Aug 1;14(7):829-839. doi: 10.70252/PDYR6658. eCollection 2021.
This study examined the physiological changes resulting from training on a lower body positive pressure treadmill (LBPPT) at three different levels of body weight support (BWS). Thirty-three healthy college aged students (22.3 ± 3.1 years) completed the study. Participants performed a graded exercise test (GXT) to exhaustion and were placed into one of three experimental groups corresponding to 100%, 75%, and 50% of their normal BW. Participants trained at their experimental BW levels for eight-weeks. Training speed was monitored by heart rate (HR) and speed was adjusted to elicit approximately 60% of participant's peak oxygen uptake (V̇O) at normal BW prior to including body weight support (BWS). One-way analysis of variance (ANOVA) was used to compare the change in aerobic capacity. The 100% BW group improved their relative V̇O (1.42 ± 1.52 ml · min · kg) when compared to the 50% BW group (-0.87 ± 2.20 ml · min · kg [p = .022]) but not the 75% BW group (-0.16 ± 1.92 ml · min · kg, [p = .14]). Furthermore, no statistical differences in V̇O were observed between the 75% and 50% BW groups (p = .66). Based on this study, training at 75% and 50% of normal BW on a LBPPT does not improve aerobic capacity compared to training with no BWS when using training speeds derived from a GXT with full BW. The outcome of this study may help to prescribe training speeds while utilizing a LBPPT to maintain or improve aerobic capacity.
本研究考察了在三种不同体重支持（BWS）水平的下肢正压跑步机（LBPPT）上训练所导致的生理变化。33名健康的大学生（22.3±3.1岁）完成了该研究。参与者进行了递增运动试验（GXT）直至力竭，并被分为三个实验组之一，分别对应其正常体重的100%、75%和50%。参与者在其实验体重水平下训练八周。训练速度通过心率（HR）进行监测，并且在加入体重支持（BWS）之前，将速度调整为在正常体重时引发参与者大约60%的峰值摄氧量（V̇O）。使用单因素方差分析（ANOVA）来比较有氧能力的变化。与50%体重组（-0.87±2.20毫升·分钟·千克[p = 0.022]）相比，100%体重组改善了其相对V̇O（1.42±1.52毫升·分钟·千克），但与75%体重组（-0.16±1.92毫升·分钟·千克，[p = 0.14]）相比没有改善。此外，75%体重组和50%体重组之间在V̇O上未观察到统计学差异（p = 0.66）。基于本研究，当使用来自全体重GXT的训练速度时，在LBPPT上以正常体重的75%和50%进行训练与无体重支持训练相比，不会提高有氧能力。本研究结果可能有助于在使用LBPPT维持或提高有氧能力时规定训练速度。
