Functional electrical stimulation to the abdominal wall muscles synchronized with the expiratory flow does not induce muscle fatigue

DOI Web Site 参考文献6件
  • Okuno Yukako
    Department of Physical Therapy, Ibaraki Prefectural University of Health Sciences: 4669-2 Ami, Ibaraki 300-0394, Japan
  • Takahashi Ryoichi
    Department of Physical Therapy, Ibaraki Prefectural University of Health Sciences: 4669-2 Ami, Ibaraki 300-0394, Japan
  • Sewa Yoko
    Graduate School of Health Sciences, Ibaraki Prefectural University of Health Sciences, Japan
  • Ohse Hirotaka
    Department of Internal Medicine, Ibaraki Prefectural University of Health Science Hospital, Japan
  • Imura Shigeyuki
    Department of Physical Therapy, Ibaraki Prefectural University of Health Sciences: 4669-2 Ami, Ibaraki 300-0394, Japan Graduate School of Health Sciences, Ibaraki Prefectural University of Health Sciences, Japan
  • Tomita Kazuhide
    Department of Physical Therapy, Ibaraki Prefectural University of Health Sciences: 4669-2 Ami, Ibaraki 300-0394, Japan Graduate School of Health Sciences, Ibaraki Prefectural University of Health Sciences, Japan

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<p> [Purpose] Continuous electrical stimulation of abdominal wall muscles is known to induce mild muscle fatigue. However, it is not clear whether this is also true for functional electrical stimulation delivered only during the expiratory phase of breathing. This study aimed to examine whether or not intermittent electrical stimulation delivered to abdominal wall muscles induces muscle fatigue. [Subjects and Methods] The subjects were nine healthy adults. Abdominal electrical stimulation was applied for 1.5 seconds from the start of expiration and then turned off during inspiration. The electrodes were attached to both sides of the abdomen at the lower margin of the 12th rib. Abdominal electrical stimulation was delivered for 15 minutes with the subject in a seated position. Expiratory flow was measured during stimulus. Trunk flexor torque and electromyography activity were measured to evaluate abdominal muscle fatigue. [Results] The mean stimulation on/off ratio was 1:2.3. The declining rate of abdominal muscle torque was 61.1 ± 19.1% before stimulus and 56.5 ± 20.9% after stimulus, not significantly different. The declining rate of mean power frequency was 47.8 ± 11.7% before stimulus and 47.9 ± 10.2% after stimulus, not significantly different. [Conclusion] It was found that intermittent electrical stimulation to abdominal muscles synchronized with the expiratory would not induce muscle fatigue.</p>

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