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在高于和低于临界功率骑行至力竭过程中神经肌肉反应的变化时间进程。

Time course of changes in neuromuscular responses during rides to exhaustion above and below critical power.

作者信息

Dinyer Taylor K, Byrd M Travis, Cochrane-Snyman Kristen C, Jenkins Nathaniel DM, Housh Terry J, Schmidt Richard J, Johnson Glen O, Bergstrom Haley C

机构信息

Department of Kinesiology and Health Promotion, University of Kentucky, Lexington, KY 40502, USA.

Department of Kinesiology, California State University, Fresno, CA 93740, USA.

出版信息

J Musculoskelet Neuronal Interact. 2019 Sep 1;19(3):266-275.

PMID:31475933
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6737559/
Abstract

OBJECTIVES

To examine the time course of changes in electromyographic (EMG) and mechanomyographic (MMG) amplitude (AMP) and mean power frequency (MPF) responses during cycle ergometry to exhaustion performed above (CP) and below (CP) critical power (CP) to infer motor unit activation strategies used to maintain power output.

METHODS

Participants performed a 3-min all out test to determine CP, and 2 randomly ordered, continuous rides to exhaustion at CP and CP·V̇O, EMG AMP, EMG MPF, MMG AMP, MMG MPF, and time to exhaustion (T) were recorded. Responses at CP and CP were analyzed separately.

RESULTS

At CP, EMG and MMG AMP were significantly greater than the initial 5% timepoint at 100% T. EMG MPF and MMG MPF reflected a downward trend that resulted in no significant difference between timepoints. At CP, EMG AMP was significantly greater than the initial 5% timepoint from 60% to 100% T. MMG AMP was less than the initial 5% timepoint at only 50% T. EMG and MMG MPF were significantly less than the initial 5% timepoint at 20% T and 100% T, respectively.

CONCLUSIONS

The timecourse of changes in EMG and MMG signals were different at CP and CP, but responses observed indicated cycle ergometry to exhaustion relies on similar motor unit activation strategies.

摘要

目的

研究在高于（CP）和低于（CP）临界功率（CP）进行的力竭性周期测力运动过程中，肌电图（EMG）和机械肌电图（MMG）幅度（AMP）及平均功率频率（MPF）反应的时间进程，以推断用于维持功率输出的运动单位激活策略。

方法

参与者进行3分钟全力测试以确定CP，并进行2次随机排序的持续骑行直至力竭，分别在CP和CP·V̇O时进行，记录EMG AMP、EMG MPF、MMG AMP、MMG MPF和力竭时间（T）。分别分析CP和CP时的反应。

结果

在CP时，EMG和MMG AMP在100%T时显著大于初始5%时间点。EMG MPF和MMG MPF呈下降趋势，各时间点之间无显著差异。在CP时，EMG AMP在60%至100%T时显著大于初始5%时间点。MMG AMP仅在50%T时小于初始5%时间点。EMG和MMG MPF分别在20%T和100%T时显著小于初始5%时间点。

结论

CP和CP时EMG和MMG信号变化的时间进程不同，但观察到的反应表明力竭性周期测力运动依赖于相似的运动单位激活策略。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3bcc/6737559/173e470af082/JMNI-19-266-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3bcc/6737559/e377442ffeb9/JMNI-19-266-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3bcc/6737559/173e470af082/JMNI-19-266-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3bcc/6737559/e377442ffeb9/JMNI-19-266-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3bcc/6737559/173e470af082/JMNI-19-266-g002.jpg

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