Department of Circulation and Imaging, Faculty of Medicine, Norwegian University of Science and Technology, 7489 Trondheim, Norway.
Eur J Appl Physiol. 2009 Dec;107(6):723-30. doi: 10.1007/s00421-009-1190-7. Epub 2009 Sep 16.
The purpose of this study was to investigate the effects of 4-week (16 sessions) unilateral, maximal isometric strength training on contralateral neural adaptations. Subjects were randomised to a strength training group (TG, n = 15) or to a control group (CG, n = 11). Both legs of both groups were tested for plantar flexion maximum voluntary isometric contractions (MVCs), surface electromyogram (EMG), H-reflexes and V-waves in the soleus (SOL) and gastrocnemius medialis (GM) superimposed during MVC and normalised by the M-wave (EMG/M(SUP), H(SUP)/M(SUP), V/M(SUP), respectively), before and after the training period. For the untrained leg, the TG increased compared to the CG for MVC torque (33%, P < 0.01), SOL EMG/M(SUP) (32%, P < 0.05) and SOL V/M(SUP) (24%, P < 0.05). For the trained leg, the TG increased compared to the CG for MVC torque (40%, P < 0.01), EMG/M(SUP) (SOL: 38%, P < 0.05; GM: 60%, P < 0.05) and SOL V/M(SUP) (72%, P < 0.01). H(SUP)/M(SUP) remained unchanged for both limbs. No changes occurred in the CG. These results reinforce the concept that enhanced neural drive to the contralateral agonist muscles contributes to cross-education of strength.
本研究旨在探究四周（16 次）单侧最大等长力量训练对健侧神经适应性的影响。受试者被随机分配到力量训练组（TG，n=15）或对照组（CG，n=11）。两组的双侧小腿均进行了跖屈最大随意等长收缩（MVC）、表面肌电图（EMG）、H 反射和比目鱼肌（SOL）及腓肠肌内侧（GM）的 V 波测试，MVC 期间进行叠加，并通过 M 波进行归一化（EMG/M(SUP)、H(SUP)/M(SUP)、V/M(SUP)），分别在训练前后进行测试。对于未经训练的腿，与 CG 相比，TG 组的 MVC 扭矩（33%，P<0.01）、SOL EMG/M(SUP)（32%，P<0.05）和 SOL V/M(SUP)（24%，P<0.05）均增加。对于训练过的腿，与 CG 相比，TG 组的 MVC 扭矩（40%，P<0.01）、EMG/M(SUP)（SOL：38%，P<0.05；GM：60%，P<0.05）和 SOL V/M(SUP)（72%，P<0.01）均增加。双侧 H(SUP)/M(SUP) 均无变化。CG 组没有变化。这些结果强化了一个概念，即增强对健侧拮抗剂肌肉的神经驱动有助于力量的交叉教育。
