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角速度会影响等速轴向旋转过程中的躯干肌肉力量和肌电图激活情况。

Angular velocity affects trunk muscle strength and EMG activation during isokinetic axial rotation.

作者信息

Fan Jian-Zhong, Liu Xia, Ni Guo-Xin

机构信息

Department of Rehabilitation Medicine, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China.

Department of Rehabilitation Medicine, Binzhou Medical University Hospital, Binzhou 256603, China.

出版信息

Biomed Res Int. 2014;2014:623191. doi: 10.1155/2014/623191. Epub 2014 Apr 8.

DOI:10.1155/2014/623191
PMID:24804227
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC3996988/
Abstract

OBJECTIVE

To evaluate trunk muscle strength and EMG activation during isokinetic axial rotation at different angular velocities.

METHOD

Twenty-four healthy young men performed isokinetic axial rotation in right and left directions at 30, 60, and 120 degrees per second angular velocity. Simultaneously, surface EMG was recorded on external oblique (EO), internal oblique (IO), and latissimus dorsi (LD) bilaterally.

RESULTS

In each direction, with the increase of angular velocity, peak torque decreased, whereas peak power increased. During isokinetic axial rotation, contralateral EO as well as ipsilateral IO and LD acted as primary agonists, whereas, ipsilateral EO as well as contralateral IO and LD acted as primary antagonistic muscles. For each primary agonist, the root mean square values decreased with the increase of angular velocity. Antagonist coactiviation was observed at each velocity; however, it appears to be higher with the increase of angular velocity.

CONCLUSION

Our results suggest that velocity of rotation has great impact on the axial rotation torque and EMG activity. An inverse relationship of angular velocity was suggested with the axial rotation torque as well as root mean square value of individual trunk muscle. In addition, higher velocity is associated with higher coactivation of antagonist, leading to a decrease in torque with the increase of velocity.

摘要

目的

评估在不同角速度下等速轴向旋转过程中的躯干肌肉力量和肌电图激活情况。

方法

24名健康年轻男性以每秒30、60和120度的角速度在左右方向进行等速轴向旋转。同时，双侧记录腹外斜肌（EO）、腹内斜肌（IO）和背阔肌（LD）的表面肌电图。

结果

在每个方向上，随着角速度的增加，峰值扭矩降低，而峰值功率增加。在等速轴向旋转过程中，对侧的腹外斜肌以及同侧的腹内斜肌和背阔肌作为主要的主动肌，而同侧的腹外斜肌以及对侧的腹内斜肌和背阔肌作为主要的拮抗肌。对于每个主要主动肌，均方根值随着角速度的增加而降低。在每个速度下均观察到拮抗肌共同激活；然而，随着角速度的增加，其似乎更高。

结论

我们的结果表明，旋转速度对轴向旋转扭矩和肌电图活动有很大影响。角速度与轴向旋转扭矩以及单个躯干肌肉的均方根值呈负相关。此外，较高的速度与拮抗肌更高的共同激活相关，导致随着速度的增加扭矩降低。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c3fd/3996988/102fbea129bd/BMRI2014-623191.006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c3fd/3996988/4dfe29f275ef/BMRI2014-623191.001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c3fd/3996988/340cc88cf2a1/BMRI2014-623191.002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c3fd/3996988/a746b7651cdc/BMRI2014-623191.003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c3fd/3996988/49bf4685bf1e/BMRI2014-623191.004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c3fd/3996988/3c2e471b62fc/BMRI2014-623191.005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c3fd/3996988/102fbea129bd/BMRI2014-623191.006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c3fd/3996988/4dfe29f275ef/BMRI2014-623191.001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c3fd/3996988/340cc88cf2a1/BMRI2014-623191.002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c3fd/3996988/a746b7651cdc/BMRI2014-623191.003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c3fd/3996988/49bf4685bf1e/BMRI2014-623191.004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c3fd/3996988/3c2e471b62fc/BMRI2014-623191.005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c3fd/3996988/102fbea129bd/BMRI2014-623191.006.jpg

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