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Hyperexcitability to electrical stimulation and accelerated muscle fatiguability of taut bands in rats
  1. Yong-Hui Wang1,
  2. Ming-Jing Yin2,
  3. Zhen-Zhen Fan1,
  4. Lars Arendt-Nielsen3,
  5. Hong-You Ge3,
  6. Shou-Wei Yue1
  1. 1Department of Physical Medicine and Rehabilitation, Qilu Hospital, Medical School of Shandong University, Jinan, People's Republic of China
  2. 2Department of Chemistry and Chemical Engineering, Heze University, Heze, People's Republic of China
  3. 3Department of Health Science and Technology, Laboratory for Experimental Pain Research, Center for Sensory–Motor Interaction (SMI), Aalborg University, Aalborg, Denmark
  1. Correspondence to Dr Shou-Wei Yue, Department of Physical Medicine and Rehabilitation, Qilu Hospital, Medical School of Shandong University, Jinan 250012, People's Republic of China; wangyonghui0000{at}sina.com.cn

Abstract

Objective Myofascial trigger points contribute significantly to musculoskeletal pain and motor dysfunction and may be associated with accelerated muscle fatiguability. The aim of this study was to investigate the electrically induced force and fatigue characteristics of muscle taut bands in rats.

Methods Muscle taut bands were dissected out and subjected to trains of electrical stimulation. The electrical threshold intensity for muscle contraction and maximum contraction force (MCF), electrical intensity dependent fatigue and electrical frequency dependent fatigue characteristics were assessed in three different sessions (n=10 each) and compared with non-taut bands in the biceps femoris muscle.

Results The threshold intensity for muscle contraction and MCF at the 10th, 15th and 20th intensity dependent fatigue stimuli of taut bands were significantly lower than those of non-taut bands (all p<0.05). The MCF at the 15th and 20th intensity dependent fatigue stimuli of taut bands were significantly lower than those at the 1st and 5th stimuli (all p<0.01). The MCF in the frequency dependent fatigue test was significantly higher and the stimulus frequency that induced MCF was significantly lower for taut bands than for non-taut bands (both p<0.01).

Conclusions The present study demonstrates that the muscle taut band itself was more excitable to electrical stimulation and significantly less fatigue resistant than normal muscle fibres.

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