The Journal of Korean Physical Therapy

The Korean Society of Physical Therapy (대한물리치료학회)
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Analysis of Surface EMG Power Spectrum and Muscle Fatigue Depending on the Variable of Neuromuscular Electrical Stimulation

표면근전도를 이용한 신경근 전기자극 치료변수에 따른 근피로도 분석

  • Kim, Gi-Won (Research Institute of Health Sciences, Korea University) ;
  • Kim, Junesun (Department of Physical Therapy, College of Health Science, Korea University)
  • 김기원 (고려대학교 보건과학연구소) ;
  • 김준선 (고려대학교 보건과학대학 물리치료학과)
  • Received : 2014.09.15
  • Accepted : 2014.10.14
  • Published : 2014.10.25
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Abstract

Purpose: This study was conducted in order to determine the stimulation variables which should be considered when neuromuscular electrical stimulation (NMES) is applied for a muscle under the normal innervation to minimize muscle fatigue and increase 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, 1:3 group, 1:5 group, and control group with on-off ratio of NMES. The subjects performed a fatigue task, consisting of 10 times of isometric contraction sustained by NMES. NMES using Russian current stimulation was applied to muscle fatigue and divided into three sessions by pulse frequency (10 bps, 30 bps, 90 bps). The EMG was recorded using an MP 100 system from the quadriceps femoris 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 pulse frequencies 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 and the 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 1:1 group 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 lower muscle fatigue. Therefore, on-off ratio needs to be great enough, and will be more efficient with the frequency 30 bps rather than of 10 bps and 90 bps.

Keywords

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