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J Phys Ther Sci. 2014 Mar;26(3):323-9. doi: 10.1589/jpts.26.323. Epub 2014 Mar 25.

Properties of Force Output and Spectral EMG in Young Patients with Nonspecific Low Back Pain during Isometric Trunk Extension.

Journal of physical therapy science

Tatsuhiro Miura, Keishoku Sakuraba

Affiliations

  1. Department of Sports Medicine, Graduate School of Medicine, Juntendo University, Japan.
  2. Department of Sports Medicine, Graduate School of Health and Sports Science, Juntendo University, Japan.

PMID: 24707077 PMCID: PMC3975996 DOI: 10.1589/jpts.26.323

Abstract

[Purpose] To clarify the influence of nonspecific low back pain (NSLBP) on force fluctuation and the myoelectric data of back muscles during isometric trunk extension at low to high force levels. [Subjects] Fourteen male subjects with NSLBP and 14 healthy male control subjects participated in this study. [Methods] All participants extended their trunk isometrically maintaining 10 levels of target force [2, 5, 10, 15, 20, 30, 50, 70, 80 and 90% of maximal voluntary contraction (MVC) in a random order] for about 4 seconds with visual feedback. A force transducer and tri-axis force sensor were positioned at the 7th thoracic vertebra to measure force output and the direction of force. Myoelectric activities of the back muscles (longissimus thoracis, L2 level; multifidus, S1 level) were recorded by surface electromyography. [Results] Force output of NSLBP subjects fluctuated more than that of healthy subjects at 30% and 50%MVC. Higher median power frequency in the multifidus was observed in NSLBP subjects at moderate to high force levels. [Conclusion] These results show that the properties of force output in NSLBP subjects differ from those in healthy subjects, suggesting that the assessment of force fluctuation of back muscles at moderate force levels is a useful index for evaluating and discriminating NSLBP.

Keywords: Back muscle; Force fluctuation; Nonspecific low back pain

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