Reproducibility of muscle fibre conduction velocity during linearly increasing force contractions
Reproducibility of muscle fibre conduction velocity during linearly increasing force contractions
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DOI：
10.1016/j.jelekin.2020.102439
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发表时间：
2020-08-01
影响因子：
2.5
通讯作者：
Del Vecchio, Alessandro
中科院分区：
文献类型：
--
作者：
Casolo, Andrea;Nuccio, Stefano;Del Vecchio, Alessandro
肌纤维传导速度（MFCV）是与肌纤维直径和肌膜性质有关的基本生理参数。本研究的目的是评估自主力与多通道高密度表面肌电记录（HDsEMG）估计的平均肌纤维传导速度（MFCV）之间关系的间歇可重复性。10名健康男性在两次独立的实验中进行了6次线性增加的踝关节背屈，间隔4周。每次实验都记录了最大等距收缩（MViF）和亚最大斜面收缩（35-50-70% MViF）时的自主力。同时，检测胫骨前肌的HDsEMG活动，并在250 ms周期内获得MFCV估计。MFCV初始值（截距）和变化率（回归斜率）作为力函数的绝对再现性和相对再现性采用受试者内相关系数（CVw）和类内相关系数（ICC）进行评估。在所有个体和WA条件下，MFCV与自主力呈正相关（R-2 = 0.75 +/- 0.12） （P < 0.001）。MFCV截距和斜率的平均CVw分别为2.6 +/- 2.0%和11.9 +/- 3.2%，ICC值分别为0.96和0.94。总体而言，MFCV回归系数在绝对和相对条件下都显示出高度的间歇可重复性。这些结果可能在跟踪训练引起的神经肌肉变化和/或监测神经肌肉疾病的进展方面具有重要的实际意义，当完整的表面肌电信号分解有问题或不可能时。
Muscle fibre conduction velocity (MFCV) is a basic physiological parameter biophysically related to the diameter of muscle fibres and properties of the sarcolemma. The aim of this study was to assess the intersession reproducibility of the relation between voluntary force and estimates of average muscle fibre conduction velocity (MFCV) from multichannel high-density surface electromyographic recordings (HDsEMG). Ten healthy men performed six linearly increasing isometric ankle dorsiflexions on two separate experimental sessions, 4 weeks apart. Each session involved the recordings of voluntary force during maximal isometric (MViF) and submaximal ramp contractions at 35-50-70% of MViF. Concurrently, the HDsEMG activity was detected from the tibialis anterior muscle and MFCV estimates were derived in 250-ms epochs. Absolute and relative reproducibility of MFCV initial value (intercept) and rate of change (regression slope) as a function of force were assessed by within-subject coefficient of correlation (CVw) and with intraclass correlation coefficient (ICC). MFCV was positively correlated with voluntary force (R-2 = 0.75 +/- 0.12) in all individuals and WA conditions (P < 0.001). Average CVw for MFCV intercept and slope were of 2.6 +/- 2.0% and 11.9 +/- 3.2% and ICC values of 0.96 and 0.94, respectively.Overall, MFCV regression coefficients showed a high degree of intersession reproducibility in both absolute and relative terms. These results may have important practical implications in the tracking of training-induced neuromuscular changes and/or in the monitoring of the progress of neuromuscular disorders when a full sEMG signal decomposition is problematic or not possible.