Publication: Fatigue sensation, electromyographical and hemodynamic changes of low back muscles during repeated static contraction
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Issued Date
2011-03-01
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14396319
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2-s2.0-79951953336
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Mahidol University
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SCOPUS
Bibliographic Citation
European Journal of Applied Physiology. Vol.111, No.3 (2011), 459-467
Suggested Citation
Mehrnoosh Movahed, Jun Ya Ohashi, Nopporn Kurustien, Hiroyuki Izumi, Masaharu Kumashiro Fatigue sensation, electromyographical and hemodynamic changes of low back muscles during repeated static contraction. European Journal of Applied Physiology. Vol.111, No.3 (2011), 459-467. doi:10.1007/s00421-010-1660-y Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/12615
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Title
Fatigue sensation, electromyographical and hemodynamic changes of low back muscles during repeated static contraction
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Abstract
The effects of work strategy and a rest condition on the physiological changes of the erector spinae muscle were studied. Eleven volunteers repeated fatiguing static contractions of holding an industrial box in 30° trunk flexion for a repetition of 12 times interrupted by rests for which the duration was equal to the duration of each preceding contraction. Each contraction was stopped at two fatigue sensation levels; moderate or strong, which corresponded to Borg's CR-10 3 and 5, as the work strategy conditions. The repeated contractions were performed for a total of eight conditions combined with the two rest conditions, with and without stretch exercise, and two contraction levels of 10 and 40% maximum pulling force in flexed posture (MVC) on separate days. Near-infrared spectroscopy and surface electromyography (EMG) were recorded. Amplitude and median frequency (MF) of EMG, oxy-hemoglobin, and deoxy-hemoglobin were calculated. MF related to fatigue sensation most closely. Oxy-hemoglobin decreased during each contraction. It, however, increased with repetition especially at 10% MVC and the increase was interpreted as adaptation to the work. The effect of the work strategy and the rest conditions was weak. MF decreased more in a strong work strategy condition than in a moderate one. © 2010 Springer-Verlag.