Laser-detected lateral muscle displacement is correlated with force fluctuations during voluntary contractions in humans.
Laser-detected lateral muscle displacement is correlated with force fluctuations during voluntary contractions in humans.
复制标题
激光检测到的横向肌肉位移与人类随意收缩期间的力波动相关。
DOI：
10.1016/j.jneumeth.2008.06.022
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发表时间：
2008
影响因子：
3
通讯作者：
Shinohara,Minoru
中科院分区：
文献类型：
--
作者：
Yoshitake,Yasuhide;Masani,Kei;Shinohara,Minoru
在稳定的随意收缩过程中，肌肉力量的波动是由多个运动单元的异步激活所产生的抽搐力量的总和引起的。我们假设，振荡的横向肌肉位移，测量与非接触式高分辨率激光位移传感器，与力波动稳定，自愿收缩与人体肌肉。八名健康年轻人（20-33岁）进行稳定的等距收缩与第一背侧骨间肌。收缩强度范围为最大随意收缩力的2.5%至60%。用高分辨率激光位移传感器（0.5μm分辨率）测量肌肉表面的振荡横向位移，同时测量食指的外展力。在时域分析中，有一个显着的正峰值之间的互相关函数的横向肌肉位移和力的波动。此外，两种信号的振幅均随收缩强度呈线性增加。在频域分析中，两种信号中的频率内容相似，并且对于信号的主要频率范围（<5 Hz），信号之间存在显著的相干性。总之，激光检测到的手部肌肉的横向位移与人类稳定的自主收缩期间在宽范围的收缩强度上的力波动相关。
Fluctuations in muscle force during steady voluntary contractions result from the summation of twitch forces produced by asynchronous activation of multiple motor units. We hypothesized that oscillatory lateral muscle displacement, measured with a non-contact high-resolution laser displacement sensor, is correlated with force fluctuations during steady, voluntary contractions with a human muscle. Eight healthy young adults (20–33 yrs) performed steady isometric contractions with the first dorsal interosseus muscle. Contraction intensity ranged from 2.5% to 60% of the maximal voluntary contraction force. Oscillatory lateral displacement of the muscle surface was measured with a high-resolution laser displacement sensor (0.5μm resolution), concurrently with abduction force of the index finger. In the time-domain analysis, there was a significant positive peak in the cross-correlation function between lateral muscle displacement and force fluctuations. In addition, the amplitude increased linearly with contraction intensity in both signals. In the frequency-domain analysis, frequency content was similar in both signals, and there was significant coherence between signals for the major frequency range of the signals (<5Hz). In conclusion, laser-detected lateral displacement of a hand muscle is correlated with force fluctuations across a wide range of contraction intensity during steady voluntary contractions in humans.