Overuse of training increases mechanoreceptors in supraspinatus tendon of rats SHR

J Orthop Res. 2011 Nov;29(11):1771-4. doi: 10.1002/jor.21320. Epub 2011 May 2.


The presence of mechanoreceptors in tendon after overuse activities can be a further step to learn about tendinopathy and overuse. Studies of tendons mechanoreceptors in rats are rare. We studied 12 isogenic spontaneous hypertensive rats (SHR), which underwent an overuse protocol consisting of an hour per daily session of treadmill running at a speed of 17 m/min, 5 times/week for 4 months. Supraspinatus tendons were evaluated with immunohistochemistry using S100 protein antibodies and histological protocol. Supraspinatus tendons at the end of 4 months of overuse protocol had a high number of media mechanoreceptors (4.3) than controls (0.6). The overexpression of S100 protein antibody in overuse activities maybe could represent a adaptative effort to tendon before the tear.

MeSH terms

  • Animals
  • Cumulative Trauma Disorders / physiopathology*
  • Disease Models, Animal
  • Mechanoreceptors / physiology*
  • Physical Conditioning, Animal / adverse effects*
  • Physical Conditioning, Animal / physiology*
  • Proprioception / physiology
  • Rats
  • Rats, Inbred SHR
  • Rotator Cuff / innervation
  • Rotator Cuff / metabolism
  • Rotator Cuff / physiology*
  • S100 Proteins / metabolism
  • Shoulder Joint / physiology


  • S100 Proteins