Beyer Kyle S, Fukuda David H, Boone Carleigh H, Wells Adam J, Townsend Jeremy R, Jajtner Adam R, Gonzalez Adam M, Fragala Maren S, Hoffman Jay R, Stout Jeffrey R
Institute of Exercise Physiology and Wellness, University of Central Florida, Orlando, Florida.
J Strength Cond Res. 2016 May;30(5):1213-23. doi: 10.1519/JSC.0000000000001219.
Short-term unilateral resistance training results in cross education of strength without changes in muscle size, activation, or endocrine response. J Strength Cond Res 30(5): 1213-1223, 2016-The purpose of this study was to assess the cross education of strength and changes in the underlying mechanisms (muscle size, activation, and hormonal response) after a 4-week unilateral resistance training (URT) program. A group of 9 untrained men completed a 4-week URT program on the dominant leg (DOM), whereas cross education was measured in the nondominant leg (NON); and were compared with a control group (n = 8, CON). Unilateral isometric force (PKF), leg press (LP) and leg extension (LE) strength, muscle size (by ultrasonography) and activation (by electromyography) of the rectus femoris and vastus lateralis, and the hormonal response (testosterone, growth hormone, insulin, and insulin-like growth factor-1) were tested pretraining and posttraining. Group × time interactions were present for PKF, LP, LE, and muscle size in DOM and for LP in NON. In all interactions, the URT group improved significantly better than CON. There was a significant acute hormonal response to URT, but no chronic adaptation after the 4-week training program. Four weeks of URT resulted in an increase in strength and size of the trained musculature, and cross education of strength in the untrained musculature, which may occur without detectable changes in muscle size, activation, or the acute hormonal response.
短期单侧阻力训练可导致力量的交叉训练，而肌肉大小、激活或内分泌反应无变化。《力量与体能研究杂志》30(5): 1213 - 1223, 2016年 - 本研究的目的是评估为期4周的单侧阻力训练（URT）计划后力量的交叉训练以及潜在机制（肌肉大小、激活和激素反应）的变化。一组9名未经训练的男性在优势腿（DOM）上完成了为期4周的URT计划，而在非优势腿（NON）上测量交叉训练；并与对照组（n = 8, CON）进行比较。在训练前和训练后测试了单侧等长力量（PKF）、腿举（LP）和腿伸展（LE）力量、股直肌和股外侧肌的肌肉大小（通过超声检查）和激活（通过肌电图）以及激素反应（睾酮、生长激素、胰岛素和胰岛素样生长因子 - 1）。DOM组中PKF、LP、LE和肌肉大小以及NON组中LP存在组×时间交互作用。在所有交互作用中，URT组的改善明显优于CON组。对URT有显著的急性激素反应，但在为期4周的训练计划后没有慢性适应性变化。4周的URT导致训练肌肉的力量和大小增加，以及未训练肌肉的力量交叉训练，这可能在肌肉大小、激活或急性激素反应无明显变化的情况下发生。
