Initiating exercise training in late middle age minimally protects muscle contractile function and increases myocyte oxidative damage in senescent rats

Experimental Gerontology
Melissa M ThomasRussell T Hepple

Abstract

Age-related loss of muscle mass and function exhibits a marked acceleration from late middle age to senescence and exercise training is one method that has been proposed to slow this process. The purpose of this study was to determine if long-term treadmill exercise training initiated at late middle age could increase endogenous antioxidant enzyme activity and attenuate the loss of skeletal muscle contractile properties in the gastrocnemius/plantaris (GAS/Plan) and soleus (SOL) muscles of senescent rats (34-36 mo) through a decrease in oxidative damage. Male Fisher 344 × Brown Norway F1-hybrid rats underwent 5-7 mo of treadmill training beginning at late middle age (29 mo). A 7 mo sedentary adult group was used to investigate age-related changes. Aging caused an increase in antioxidant enzyme activities; however, only SOD activity was further increased with exercise training. Exercise training did not attenuate the decrease in twitch or tetanic tension of the GAS/Plan or SOL. It did, however, prevent the increase in twitch half relaxation time of the SOL muscle only. Oxidative damage, as reflected in carbonyl content, was increased with age and even further with exercise training in the GAS muscle. Muscle fibre cross sectional ...Continue Reading

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Citations

Oct 30, 2012·Journal of Applied Physiology·Jong-Hee Kim, Ladora V Thompson
Oct 7, 2015·The Journal of Physiology·Russell T Hepple, Charles L Rice
Apr 24, 2016·Molecular Aspects of Medicine·Thomas BriocheAngèle Chopard
Sep 30, 2016·Scientific Reports·Giorgos K SakellariouAnne McArdle
Jul 27, 2017·Journal of Cachexia, Sarcopenia and Muscle·Giorgos K SakellariouBrian McDonagh
Mar 12, 2019·The Journals of Gerontology. Series A, Biological Sciences and Medical Sciences·Vita SonjakRussell T Hepple
Apr 10, 2015·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Tanya M HollowayLawrence L Spriet

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