The interaction of respiration and visual feedback on the control of force and neural activation of the agonist muscle
The interaction of respiration and visual feedback on the control of force and neural activation of the agonist muscle
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DOI：
10.1016/j.humov.2010.09.007
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发表时间：
2011-12-01
影响因子：
2.1
通讯作者：
Christou, Evangelos A.
中科院分区：
文献类型：
--
作者：
Baweja, Harsimran S.;Patel, Bhavini K.;Christou, Evangelos A.
本研究的目的是比较当呼吸幅度和视觉反馈的幅度不同时，在不同的力量水平下恒定等长收缩时，激动肌的力量变异性和神经激活。20名年轻人(20-32岁，10名男性和10名女性)被指示在有无视觉反馈的情况下，在食指外展的同时控制他们不同幅度的呼吸(85%，100%和125%正常)，以准确地匹配他们最大自愿收缩(MVC)的15%和50%的目标力。每个实验持续22次，8-12岁的S和16-20岁的S被移除视觉反馈。每个受试者在每个力量水平下进行三次实验，每个人的呼吸状况。力的变异性被量化为去趋势力数据的标准偏差。将双极表面电极置于神经支配带远端，测量第一骨间背侧肌(FDI)的神经活动。相对于正常呼吸，力量变异性只有在高幅度呼吸时才显著增加(类似于63%)。从正常呼吸到高幅度呼吸的力量变异性的增加与从0到3赫兹的放大的力量振荡密切相关(R-2从.68到.84，p<；.001)。此外，在50%MVC的视觉反馈(视觉与非视觉：0.97比0.87 N)下，力量变异性的增加会加剧，并与0-1赫兹(R-2=.82)的放大的力振荡强烈相关，与12-30赫兹(R-2=0.24)的更大功率的激动肌的肌电信号弱相关。我们的发现表明，在中等水平的努力中，高幅度呼吸和力的视觉反馈相互作用并放大了年轻人的力量变异性。(C)2011爱思唯尔B.V.保留所有权利。
The purpose of this study was to compare force variability and the neural activation of the agonist muscle during constant isometric contractions at different force levels when the amplitude of respiration and visual feedback were varied. Twenty young adults (20-32 years, 10 men and 10 women) were instructed to accurately match a target force at 15% and 50% of their maximal voluntary contraction (MVC) with abduction of the index finger while controlling their respiration at different amplitudes (85%, 100% and 125% normal) in the presence and absence of visual feedback. Each trial lasted 22 s and visual feedback was removed from 8-12 and 16-20 s. Each subject performed three trials with each respiratory condition at each force level. Force variability was quantified as the standard deviation of the detrended force data. The neural activation of the first dorsal interosseus (FDI) was measured with bipolar surface electrodes placed distal to the innervation zone. Relative to normal respiration, force variability increased significantly only during high-amplitude respiration (similar to 63%). The increase in force variability from normal- to high-amplitude respiration was strongly associated with amplified force oscillations from 0 to 3 Hz (R-2 ranged from .68 to .84, p < .001). Furthermore, the increase in force variability was exacerbated in the presence of visual feedback at 50% MVC (vision vs. no-vision: .97 vs. .87 N) and was strongly associated with amplified force oscillations from 0 to 1 Hz (R-2 = .82) and weakly associated with greater power from 12 to 30 Hz (R-2 = .24) in the EMG of the agonist muscle. Our findings demonstrate that high-amplitude respiration and visual feedback of force interact and amplify force variability in young adults during moderate levels of effort. (C) 2011 Elsevier B.V. All rights reserved.