Modulation of exercise training related adaptation of body composition and regulatory pathways by anabolic steroids

Reitzner, Stefan Markus; Hengevoß, Jonas; Isenmann, Eduard; Diel, Patrick

doi:10.1016/j.jsbmb.2019.03.023

Cited by 2 publications

(1 citation statement)

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“…Interestingly, muscle fiber type distribution showed limited effects by anabolic steroids alone, but slow-twitch oxidative fiber cross-sectional area (CSA) was increased when endurance exercise was combined with mesterolone administration [ 56 ]. Alternatively, a 6-week treadmill protocol found neither endurance exercise nor anabolic steroids altered muscle mass or CSA in male rats [ 57 ], but exercise or steroids alone reduced adiposity and was further reduced with the two treatments combined. This points to a complicated relationship on body composition between circulating androgenic activity and exercise, especially when in combination.…”

Section: Introductionmentioning

confidence: 99%

Myocytic androgen receptor overexpression does not affect sex differences in adaptation to chronic endurance exercise

Barsky

Monks

2022

Biol Sex Differ

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Muscle-specific androgen receptor (AR) overexpression (HSAAR transgene) in sedentary male rats results in reduced adiposity, increased mitochondrial enzyme activity, and selective increase in Type 2b myofiber size. Here, we tested chronic endurance exercise interactions with this phenotype in both sexes. Across 9 weeks, rats ran 5×/week on motorized running wheels at increasing speeds and durations. Exercise reduced fat mass in all groups, but sex affected endurance exercise outcomes such that absolute lean mass increased only in females and total body mass decreased only in males. Expected sex differences were observed with males exhibiting greater total body and lean mass; absolute and relative fat mass; bone mineral density; extensor digitorum longus (EDL) myofiber size and glycolytic proportion; but lesser Type 2a and Type 1 myosin expression in tibialis anterior. Observed HSAAR outcomes were not altered by sex, with transgenic rats having greater lean mass, Type 2a myosin expression in soleus, and glycolytic myofiber size in EDL. Tibialis AR content was independently affected by sex, HSAAR, and exercise. No sex differences were observed in tibialis AR expression in wild-type rats, although HSAAR males had greater AR content than HSAAR females. We identified a moderate correlation between AR expression and glycolytic myofiber size, but not whole-body composition. Overall, results suggest myocytic AR overexpression and chronic exercise, despite sharing a similar phenotype to adaptation, are mediated by distinct mechanisms. Further, this study illustrates sex differences in adaptation to chronic endurance exercise, and suggests sex-similarity in the relationship between muscle AR and exercise response.

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Section: Introductionmentioning

confidence: 99%