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초록

Purpose: This study was conducted in order to determine the stimulation variables which should be considered whenneuromuscular electrical stimulation (NMES) is applied for a muscle under the normal innervation to minimize muscle fatigue andincrease force-generating ability. Methods: A total of 23 healthy men participated in the study and all subjects were randomly assigned to the 1:1 group, 1:3group, 1:5 group, and control group with on-off ratio of NMES. The subjects performed a fatigue task, consisting of 10 times ofisometric contraction sustained by NMES. NMES using Russian current stimulation was applied to muscle fatigue and divided intothree sessions by pulse frequency (10 bps, 30 bps, 90 bps). The EMG was recorded using an MP 100 system from the quadricepsfemoris muscle in four groups. Results: The differences of delta MdF and delta MF of between on-off ratio groups of 10 bps, 30 bps, and 90 bps pulsefrequencies were very significant (p<0.05). According to the results of post hoc of 10, 90 bps, it was greater in the 1:1 group andthe 1:3 group compared with the 1:5 group, and no fatigue was observed in the control group. In 30 bps, it was greater in the 1:1group compared with 1:3, 1:5, and control group (p<.05). Conclusion: Among NMES variables to minimize muscle fatigue, the larger on-off ratio by pulse frequency showed the lowermuscle fatigue. Therefore, on-off ratio needs to be great enough, and will be more efficient with the frequency 30 bps ratherthan of 10 bps and 90 bps

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