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摘要
Problem Statement: In mechanomyography (MMG), crosstalk refers to the contamination of the signal from the muscle of interest by the signal from another muscle or muscle group that is in close proximity. Purpose: The aim of the present study was two-fold: i) to quantify the level of crosstalk in the mechanomyographic (MMG) signals from the longitudinal (L-o), lateral (L-a) and transverse (T-r) axes of the extensor digitorum (ED), extensor carpi ulnaris (ECU) and flexor carpi ulnaris (FCU) muscles during isometric wrist flexion (WF) and extension (WE), radial (RD) and ulnar (UD) deviations; and ii) to analyze whether the three-directional MMG signals influence the level of crosstalk between the muscle groups during these wrist postures. Methods: Twenty, healthy right-handed men (mean +/- SD: age = 26.7 +/- 3.83 y; height = 174.47 +/- 6.3 cm; mass = 72.79 +/- 14.36 kg) participated in this study. During each wrist posture, the MMG signals propagated through the axes of the muscles were detected using three separate tri-axial accelerometers. The x-axis, y-axis, and z-axis of the sensor were placed in the L-o, L-a, and T-r directions with respect to muscle fibers. The peak cross-correlations were used to quantify the proportion of crosstalk between the different muscle groups. Results: The average level of crosstalk in the MMG signals generated by the muscle groups ranged from: 34.28-69.69% for the L-o axis, 27.32-52.55% for the L-a axis and 11.38-25.55% for the T-r axis for all participants and their wrist postures. The T-r axes between the muscle groups showed significantly smaller crosstalk values for all wrist postures [F (2, 38) = 14-63, p<0.05, eta(2) = 0.416-0.769]. Significance: The results may be applied in the field of human movement research, especially for the examination of muscle mechanics during various types of the wrist postures.
- 出版日期2014-8-4
