A study was conducted to analyze leg muscle activity during walking using integration analysis and wavelet frequency analysis of the surface electromyogram, and to investigate the features of each muscle. The subjects were 20 healthy women. Electromyographic activities of the gluteus maximus (GMax), gluteus medius (GMed), tensor fasciae latae (TFL), vastus lateralis (VL), tibialis anterior (TA), and medial gastrocnemius (GC) muscles were measured.
It was found that the peak %IEMG of the GMax, GMed, TFL, VL, and TA occurred between the moment of initial contact during the walking cycle and the loading response. Comparison of the zones of %power of each muscle at this time showed that HFB of the TFL, LFB of the Gmed and TA, and MFB of the GMax were predominant, whereas the VL showed no definitive feature. In the terminal stance of the walking cycle, the peak %IEMG was evident in the GC, and LFB was a predominant feature of %power at this time. These results suggest that the leg muscles examined show differences in both qualitative (%IEMG) and quantitative (%power) features during the walking cycle.

DESCENTE SPORTS SCIENCE Vol.27/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE