Research Institute for Sport and Exercise, University of Canberra, Canberra, ACT, Australia.
Australian Institute of Sport, Canberra, ACT, Australia.
J Strength Cond Res. 2022 Jul 1;36(7):1961-1965. doi: 10.1519/JSC.0000000000003762. Epub 2020 Sep 16.
Everett, KLA, Chapman, DW, Mitchell, JA, and Ball, N. Effects of westbound trans-meridian travel on countermovement jump performance in international-level rowers. J Strength Cond Res 36(7): 1961-1965, 2022-International long-haul air travel is a necessity for many athletes as part of their training or competition schedules. However, long-haul travel is also associated with impaired neuromuscular function. An athlete's lower body neuromuscular status is frequently assessed and monitored using countermovement jump (CMJ). This study assessed the impact of westbound trans-meridian travel on changes in CMJ performance in highly trained aerobic athletes. Highly trained male rowers (n = 21, 23.7 ± 1.4 years, 1.91 ± 0.07 m, 86.9 ± 9.9 kg) undertook a westbound flight incurring 22 hours of flight time with 30 hours of total travel time across 9 time zones. Athletes completed a single set of 6 loaded CMJ repetitions before and after travel with performance measured using a digital optical encoder attached to a 20 kg barbell. Each CMJ repetition was assessed for mean concentric velocity, jump height (JH), eccentric displacement, JH:dip ratio, mean power, and mean eccentric velocity, with comparisons made between mean set changes before and after travel. Changes were compared using a one tail paired t-test and characterized using Cohen's d (95% confidence interval) effect sizes. Significance was accepted at p ≤ 0.05. Small-to-moderate changes were observed in all variables following westbound travel. These changes may be because of retention of high training loads before travel resulting in the athletes being in a fatigued state, whereas travel time worked as a forced recovery period. Reductions in CMJ performance are likely following westbound travel, however, may be affected by training fatigue before travel that may confound CMJ performance as a monitoring metric.
埃弗雷特、KLA、查普曼、DW、米切尔、JA 和鲍尔，N. 西行跨子午线旅行对国际级赛艇运动员反跳性能的影响。J 强能力研究 36(7)：1961-1965，2022-对于许多运动员来说，国际长途航空旅行是他们训练或比赛日程的必要组成部分。然而，长途旅行也会导致神经肌肉功能受损。运动员的下肢神经肌肉状态通常使用反跳跳（CMJ）进行评估和监测。本研究评估了西行跨子午线旅行对高度训练的有氧运动员 CMJ 性能变化的影响。21 名高度训练的男性赛艇运动员（n=21，23.7±1.4 岁，1.91±0.07 米，86.9±9.9 公斤）乘坐西行航班，飞行时间 22 小时，总旅行时间 30 小时，跨越 9 个时区。运动员在旅行前后完成一组 6 次负重 CMJ 重复，使用附在 20 公斤杠铃上的数字光学编码器测量性能。每次 CMJ 重复都评估了平均向心速度、跳跃高度（JH）、离心位移、JH：下降比、平均功率和平均离心速度，并比较了旅行前后平均集变化。使用单尾配对 t 检验进行比较，并使用 Cohen's d（95%置信区间）效应大小进行特征描述。p≤0.05 时为差异有统计学意义。西行后，所有变量均观察到小到中度变化。这些变化可能是由于旅行前保持高训练负荷导致运动员处于疲劳状态，而旅行时间则作为强制恢复期。西行后 CMJ 性能可能会下降，但可能会受到旅行前训练疲劳的影响，这可能会混淆 CMJ 性能作为监测指标。
