Laurentian University, Human Kinetic, School of Human Kinetics, Sudbury, Canada.
Int J Sports Med. 2010 May;31(5):311-8. doi: 10.1055/s-0030-1248329. Epub 2010 Mar 3.
The aim of this study was to understand the amplitude and localization of neuromuscular response induced by a training session combining an aerobic and a resistance component. Ten healthy men completed a single session of combined (aerobic and resistance) and aerobic only training, in a randomized order. Surface electromyographic activity and torque obtained during maximal voluntary and electrically evoked contractions of the knee extensor muscles were analyzed to distinguish peripheral from central adaptations. The isometric torque developed by the knee extensor muscles during maximal voluntary contraction decreased significantly following a single session of both combined (-9.2%, p=0.043) and aerobic (-9.6%, p=0.005) training. This was accompanied by a decrease in central activation of the knee extensor muscles after each training session (respectively 2.9, p=0.005 and 1.8% p=0.040) as indicated by twitch interpolation technique. After the combined training protocol, the peak torque of the twitch significantly increased by 6.8% (p=0.046), whereas it decreased by 17.3% (p=0.016) after the aerobic training protocol. The present study demonstrates that the decrease in torque production is similar after a single combined training session or after an aerobic training session of the same duration. Both central and peripheral mechanisms could explain the decrease of torque.
本研究旨在了解结合有氧和抗阻成分的训练对神经肌肉反应幅度和定位的影响。10 名健康男性以随机顺序完成了一次结合（有氧和抗阻）和单纯有氧训练。分析表面肌电图活动和最大自主及电诱发膝关节伸肌收缩时的扭矩，以区分外周和中枢适应。单次结合（-9.2%，p=0.043）和单纯有氧（-9.6%，p=0.005）训练后，膝关节伸肌最大自主收缩时产生的等长扭矩显著降低。这伴随着每次训练后膝关节伸肌的中枢激活降低（分别为 2.9%，p=0.005 和 1.8%，p=0.040），如 twitch 插值技术所示。在结合训练方案后，twitch 的峰值扭矩显著增加了 6.8%（p=0.046），而在单纯有氧训练方案后，twitch 的峰值扭矩下降了 17.3%（p=0.016）。本研究表明，单次结合训练或相同持续时间的单纯有氧训练后，扭矩产生的降低相似。中枢和外周机制都可以解释扭矩的降低。
