Wages Nathan P, Beck Travis W, Ye Xin, Carr Joshua C
Department of Health and Exercise Science, University of Oklahoma, Norman, Oklahoma
Department of Health and Exercise Science, University of Oklahoma, Norman, Oklahoma.
Physiol Rep. 2017 Feb;5(4). doi: 10.14814/phy2.13151. Epub 2017 Feb 27.
The purpose of this investigation was to establish a better understanding of contralateral training and its effects between homologous muscles following unilateral fatiguing aerobic exercise during variable resting postural positions, and to determine if any observable disparities could be attributed to the differences between the training ages of the participants. Furthermore, we hypothesized that we would observe a contralateral cross-over effect for both groups, with the novice trained group having the higher mechanomyographic mean frequency values in both limbs, across all resting postural positions. Twenty healthy male subjects exercised on an upright cycle ergometer, using only their dominate limb, for 30 min at 60% of their VO peak. Resting electromyographic and mechanomyographic signals were measured prior to and following fatiguing aerobic exercise. We found that there were resting mechanomyographic mean frequency differences of approximately 1.9 ± 0.8% and 0.9 ± 0.7%; 9.1 ± 0.3% and 10.2 ± 3.7%; 2 ± 1.8% and 3 ± 1.4%; and 0.9 ± 0.6% and 0.2 ± 1.3% between the novice and advanced trained groups (for the upright sitting position with legs extended 180°; upright sitting position with legs bent 90°; lying supine position with legs extended 180°; and lying supine with legs bent 90°, respectively), from the dominant and nondominant limbs, respectively. We have concluded that despite the relative matching of exercise intensity between groups, acute responses to contralateral training become less accentuated as one progresses in training age. Additionally, our results lend support to the notion that there are multiple, overlapping neural and mechanical mechanisms concurrently contributing to the contralateral cross-over effects observed across the postexercise resting time course.
本研究的目的是更好地理解对侧训练及其在单侧疲劳性有氧运动后不同静息姿势下同源肌肉之间的影响，并确定是否有任何可观察到的差异可归因于参与者训练年限的差异。此外，我们假设两组都会观察到对侧交叉效应，即在所有静息姿势下，新手训练组的双下肢肌机械图平均频率值更高。20名健康男性受试者仅使用其优势肢体在直立式自行车测力计上以其最大摄氧量峰值的60%进行30分钟的运动。在疲劳性有氧运动前后测量静息肌电图和肌机械图信号。我们发现，新手训练组和进阶训练组之间，在优势肢体和非优势肢体之间，分别在直立坐姿双腿伸直180°、直立坐姿双腿弯曲90°、仰卧位双腿伸直180°以及仰卧位双腿弯曲90°时，静息肌机械图平均频率差异分别约为1.9±0.8%和0.9±0.7%、9.1±0.3%和10.2±3.7%、2±1.8%和3±1.4%、0.9±0.6%和0.2±1.3%。我们得出结论，尽管两组之间的运动强度相对匹配，但随着训练年限的增加，对侧训练的急性反应会变得不那么明显。此外，我们的结果支持了这样一种观点，即有多种重叠的神经和机械机制同时促成了运动后静息时间过程中观察到的对侧交叉效应。
