Satellite cell activity, without expansion, after nonhypertrophic stimuli

American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
Sophie JoanisseGianni Parise

Abstract

The purpose of the present studies was to determine the effect of various nonhypertrophic exercise stimuli on satellite cell (SC) pool activity in human skeletal muscle. Previously untrained men and women (men: 29 ± 9 yr and women: 29 ± 2 yr, n = 7 each) completed 6 wk of very low-volume high-intensity sprint interval training. In a separate study, recreationally active men (n = 16) and women (n = 3) completed 6 wk of either traditional moderate-intensity continuous exercise (n = 9, 21 ± 4 yr) or low-volume sprint interval training (n = 10, 21 ± 2 yr). Muscle biopsies were obtained from the vastus lateralis before and after training. The fiber type-specific SC response to training was determined, as was the activity of the SC pool using immunofluorescent microscopy of muscle cross sections. Training did not induce hypertrophy, as assessed by muscle cross-sectional area, nor did the SC pool expand in any group. However, there was an increase in the number of active SCs after each intervention. Specifically, the number of activated (Pax7(+)/MyoD(+), P ≤ 0.05) and differentiating (Pax7(-)/MyoD(+), P ≤ 0.05) SCs increased after each training intervention. Here, we report evidence of activated and cycling SCs that may or may not con...Continue Reading

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Citations

Apr 19, 2017·Exercise and Sport Sciences Reviews·Nicholas A Burd, Michael De Lisio
Mar 21, 2018·Sports Medicine·Baubak ShamimDonny M Camera
Apr 18, 2018·Exercise and Sport Sciences Reviews·Sophie JoanisseGianni Parise
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Feb 16, 2018·Skeletal Muscle·Anita KneppersRamon Langen
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Jan 25, 2017·Experimental Physiology·Lauren E SkellyMartin J Gibala
Dec 14, 2018·Clinical Kidney Journal·Tom F O'SullivanEmma L Watson
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Sep 5, 2021·FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology·Kevin A MurachCharlotte A Peterson

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