Motor effort training with low exercise intensity improves muscle strength and descending command in aging.
Motor effort training with low exercise intensity improves muscle strength and descending command in aging.
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DOI：
10.1097/md.0000000000003291
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发表时间：
2016-06
期刊：
影响因子：
1.6
通讯作者：
Yue GH
中科院分区：
文献类型：
--
作者：
Jiang C;Ranganathan VK;Zhang J;Siemionow V;Yue GH
本研究探讨了高脑力训练（MET）和常规力量训练（CST）对增加健康老年人的随意肌肉力量和与产生最大肌肉力量相关的脑信号的影响。27名老年人（年龄：75 ± 7.9岁，8名女性）被分配到3组中的一组：MET组-低强度（30%最大随意收缩[MVC]）体育锻炼结合MET，CST组-高强度肌肉收缩训练，或对照组（CTRL）-无任何形式的训练。 MET和CST持续了12周（5届会议/周）。 在训练前后测量参与者的右臂肘关节屈曲力量、肌电图（EMG）和与力量产生直接相关的运动活动相关皮层电位（MRCP）。CST组的力量增益最高（17.6%，P <0.001），MET组也有显著的力量增益（13.8%，P <0.001），尽管MET组的运动强度仅为30% MVC水平，但与CST组相比无统计学差异。 CTRL组没有显著的强度变化。令人惊讶的是，只有MET组显示出MRCP的显著增加（29.3%，P <0.001）; CST组的MRCP增加处于边界线显著性水平（12.11%，P = 0.061），而CTRL组仅为4.9%（P = 0.539）。 这些结果表明，高脑力训练结合低强度的体育锻炼是一种有效的方法，自愿肌肉加强，这种方法是特别有益的，对于那些身体虚弱，难以进行常规的力量训练。
This study explored the effect of high mental effort training (MET) and conventional strength training (CST) on increasing voluntary muscle strength and brain signal associated with producing maximal muscle force in healthy aging. Twenty-seven older adults (age: 75 ± 7.9 yr, 8 women) were assigned into 1 of 3 groups: MET group—trained with low-intensity (30% maximal voluntary contraction [MVC]) physical exercise combined with MET, CST group—trained with high-intensity muscle contractions, or control (CTRL) group—no training of any kind. MET and CST lasted for 12 weeks (5 sessions/week). The participants’ elbow flexion strength of the right arm, electromyography (EMG), and motor activity-related cortical potential (MRCP) directly related to the strength production were measured before and after training. The CST group had the highest strength gain (17.6%, P <0.001), the MET group also had significant strength gain (13.8%, P <0.001), which was not statistically different from that of the CST group even though the exercise intensity for the MET group was only at 30% MVC level. The CTRL group did not have significant strength changes. Surprisingly, only the MET group demonstrated a significant augmentation in the MRCP (29.3%, P <0.001); the MRCP increase in CST group was at boarder-line significance level (12.11%, P = 0.061) and that for CTRL group was only 4.9% (P = 0.539). These results suggest that high mental effort training combined with low-intensity physical exercise is an effective method for voluntary muscle strengthening and this approach is especially beneficial for those who are physically weak and have difficulty undergoing conventional strength training.