Resistance training increases heat shock protein levels in skeletal muscle of young and old rats

Experimental Gerontology
Zsolt MurlasitsStephen E Alway

Abstract

Heat shock proteins (HSP) HSP72, HSC70 and HSP25 protein levels and mRNA levels of HSP72 genes (Hsp72-1, Hsp72-2, Hsp72-3) and HSC70 were examined in tibialis anterior muscles from young and old rats following 4.5 weeks of heavy resistance exercise. Young (3 months) (n=10) and old (30 months) (n=9) rats were subjected to 14 sessions of electrically evoked resistance training using stretch-shortening contractions of the left limb that activated the dorsiflexor muscle group, including the tibialis anterior muscle, while the right side served as the intra-animal control. Muscle wet weight of the left tibialis anterior increased by 15.6% in young animals compared to the untrained right side, while the aged rats demonstrated no significant hypertrophy based on muscle wet weight. There were no differences in mRNA expression between the control and experimental muscles in either the old or the young animals for any of the four genes examined. On the other hand, HSP72 levels as determined by Western blots were significantly (p<0.01) higher (968.8 and 409.1%) in the trained as compared to the contralateral control muscle in young and old animals, respectively. HSP25 expression was increased significantly (p<0.01) by training in muscles ...Continue Reading

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