Wavelet-based analysis of surface mechanomyographic signals from subjects with differences in myosin heavy chain isoform content.

T W Beck, T J Housh, A C Fry, J T Cramer, J P Weir, B K Schilling, M J Falvo, C A Moore
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Abstract

The purpose of this study was to use a wavelet analysis designed specifically for surface mechanomyographic (MMG) signals to determine if the % myosin heavy chain (MHC) isoform content affected the shape of the MMG frequency spectrum during isometric muscle actions. Five resistance-trained (mean +/- SD age = 23.2 +/-3.7 yrs), five aerobically-trained (mean +/- SD age = 32.6 +/- 5.2 yrs), and five sedentary (mean +/- SD age = 23.4 +/- 4.1 yrs) men performed isometric muscle actions of the dominant leg extensors at 20%, 40%, 60%, 80%, and 100% of the maximum voluntary contraction (MVC). Surface MMG signals were detected from the vastus lateralis during each muscle action and processed with the MMG wavelet analysis. In addition, muscle biopsies were taken from the vastus lateralis and analyzed for % MHC isoform content. The results showed that there were distinct differences among the three groups of subjects for % MHC isoform content. These differences were not manifested, however, in the isometric force-related changes in the total intensity of the MMG signal in each wavelet band. It is possible that factors such as the thicknesses of the subcutaneous adipose tissue and/or iliotibial band reduced the potential influence of differences in % MHC isoform content on the MMG signal.

肌球蛋白重链异构体含量差异受试者表面肌力图信号的小波分析。
本研究的目的是使用专为表面肌力图(MMG)信号设计的小波分析来确定%肌球蛋白重链(MHC)异构体含量是否影响等长肌肉运动时MMG频谱的形状。5名阻力训练(平均+/- SD年龄= 23.2 +/-3.7岁)、5名有氧训练(平均+/- SD年龄= 32.6 +/- 5.2岁)和5名久坐(平均+/- SD年龄= 23.4 +/- 4.1岁)的男性在20%、40%、60%、80%和100%的最大自愿收缩(MVC)时进行了优势腿伸肌的等长肌肉运动。在各肌肉动作过程中检测股外侧肌表面MMG信号,并用MMG小波分析进行处理。此外,从股外侧肌取肌肉活检,分析% MHC异构体含量。结果表明,三组受试者的% MHC异构体含量存在明显差异。然而,这些差异并没有体现在各小波带中MMG信号总强度的等距力相关变化中。可能是皮下脂肪组织和/或髂胫束的厚度等因素降低了% MHC异构体含量差异对MMG信号的潜在影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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