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Effects of Frequency-Dependent Neuromuscular Electrical Stimulation on The Respiratory Strength, Quadriceps Muscle Activity and Quality of Life in Patients with Severe Chronic Obstructive Pulmonary Disease
J Korean Soc Phys Med 2019;14(3):81-89
Published online August 31, 2019;
© 2019 Journal of The Korean Society of Physical Medicine.

Jeong-Il Kang, PT, PhD⋅Dae-KeunJeong, PT, PhD⋅Jun-Su Park, PT, PhD1†

Department of Physical Therapy, Sehan University
1Department of Physical Therapy, HaenamHankook Hospital
Received April 23, 2019; Revised April 25, 2019; Accepted July 6, 2019.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
PURPOSE: To solve the problems of chronic obstructive pulmonary disease (COPD) patients complaining of muscle fatigue and having limited motor abilities, this study provided the clinical basic data for pulmonary rehabilitation by examining the effects of High·Low-Frequency Neuromuscular Electrical Stimulation (NMES) on the respiratory muscle strength, quadriceps muscle activity, and life quality.
METHODS: Samples were collected from 20 COPD patients and placed randomly in a low-frequency group (n=10) and high-frequency group (n=10). For a pretest, the respiratory muscle strength (MIP, MEP), quadriceps muscle activity (LF, VM, VL), and life quality (SGRQ) were measured. After applying NMES to each group for 30 minutes at a time, five times a week, for four weeks, a posttest was conducted in the same way as the pretest.
RESULTS: Both groups showed significant differences in the respiratory muscle strength, quadriceps muscle activity, and quality of life within the groups and there were significant differences in the quadriceps muscle activity between the groups.
CONCLUSION: The four-weeks NMES positively influenced the respiratory muscle strength and life quality by enhancing the function of the quadriceps and exercise tolerance. In particular, high-frequency(75 ㎐) NMES was more effective than low-frequency (15 ㎐) NMES. This result can be an alternative means to improve the physical functions of COPD patients clinically in the future.
Keywords : COPD, NMES, Frequency, Quadriceps muscle, Respiratory Strength

August 2019, 14 (3)
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