Abstract
The purpose of this study was to clarify how a surface electromyography (EMG) power spectral analysis for evaluation of quality of muscle is influenced by differences in the measurement methods (differences in placement of an electrodes, and in contraction pattern). The subjects were 13 healthy males aged 23.5±1.3 year old in average. Three placement points of electrodes were gluteus medius muscle belly, tendon, and tensor fasciae latae muscle belly. The contraction patterns consisted of a maximal voluntary isometric contraction (ISOME), concentric contraction (CON), and eccentric contraction (ECC). As a result, a significantly larger muscle strength was observed in ECC than in ISOME and CON. There was no difference in EMG power spectral characteristic among placement points of electrodes. As an influence of individual difference (noise in the measurement) was greater in the dynamic measurement by CON and ECC, the static measurement by ISOME considered valid.
