PMID: 11323540Apr 27, 2001Paper

Exercise training increases heat shock protein in skeletal muscles of old rats

Medicine and Science in Sports and Exercise
H NaitoJ Aoki

Abstract

The effects of chronic exercise training on the expression of heat shock protein (HSP) in skeletal muscle of senescent animals are unknown. Therefore, the purpose of this study was to investigate the effects of chronic exercise training on skeletal muscle HSP expression in both young and old rats. Young adult (3 months) and old (23 months) female Fisher 344 rats were assigned to either a sedentary control or an endurance exercise trained group (N = 6 per group). Exercised animals ran (60 min.d-1, 5 d.wk-1) on a treadmill at approximately 77% VO2peak for 10 wk. After completion of the training program, the soleus (SOL), plantaris (PL), and the red (RG) and white portions (WG) of the gastrocnemius muscles were excised, and citrate synthase (CS) activity and the relative levels of HSP72 were determined. Training resulted in increases (P < 0.05) in VO2peak in both young (67.6 +/- 3.1 vs 86.9 +/- 1.6 mL.kg-1.min-1) and old animals (54.5 +/- 1.8 vs 68.2 +/- 2.2 mL.kg-1.min-1). Training increased CS activity and the relative levels of HSP72 (P < 0.05) in all four skeletal muscles in both young and old animals. Specifically, compared with age-matched sedentary controls, exercise training resulted in increased (P < 0.05) levels of HSP72...Continue Reading

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