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European Journal of Applied Physiology

, Volume 111, Issue 3, pp 459–467 | Cite as

Fatigue sensation, electromyographical and hemodynamic changes of low back muscles during repeated static contraction

  • Mehrnoosh Movahed
  • Jun-ya Ohashi
  • Nopporn Kurustien
  • Hiroyuki Izumi
  • Masaharu Kumashiro
Original Article

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.

Keywords

Muscle fatigue Near infrared spectroscopy Erector spinae muscle Static contraction Rest Stretch exercise Actual work 

Notes

Acknowledgments

The authors would like to acknowledge with appreciation Noriaki Satoh and Yoshiyuki Higuchi for data analyzing assistance and Yasumasa Eguchi for technical advice on this experiment.

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Mehrnoosh Movahed
    • 1
  • Jun-ya Ohashi
    • 2
  • Nopporn Kurustien
    • 3
  • Hiroyuki Izumi
    • 1
  • Masaharu Kumashiro
    • 1
  1. 1.Department of Ergonomics, Institute of Industrial Ecological SciencesUniversity of Occupational and Environmental HealthKitakyushuJapan
  2. 2.Department of Management and BusinessKinki UniversityIizukaJapan
  3. 3.Faculty of Physical TherapyMahidol UniversityBangkokThailand

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