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- W4387563583 abstract "The ability of skeletal muscle to adapt to eccentric contractions has been suggested to be blunted in older muscle. If eccentric exercise is to be a safe and efficient training mode for older adults, preclinical studies need to establish if older muscle can effectively adapt and if not, determine the molecular signatures that are causing this impairment. The purpose of this study was to quantify the extent age impacts functional adaptations of muscle and identify genetic signatures associated with adaptation (or lack thereof). The anterior crural muscles of young (4 mo) and older (28 mo) female mice performed repeated bouts of eccentric contractions in vivo (50 contractions/wk for 5 wk) and isometric torque was measured across the initial and final bouts. Transcriptomics was completed by RNA-sequencing 1 wk following the 5th bout to identify common and differentially regulated genes. Young muscle exhibited a robust ability to adapt, increasing isometric torque 20-36%, while isometric torque of older muscle decreased up to 18%; adaptive potential was less in older muscle compared to young muscle (p≤0.047). Using differential gene expression, young and older muscles shared some common transcriptional changes in response to eccentric exercise training, whereas other transcripts appeared to be age dependent. That is, the ability to express particular genes after repeated bouts of eccentric contractions was not the same between ages. These molecular signatures may reveal, in part, why older muscles do not appear to be as adaptive to exercise training as young muscles." @default.
- W4387563583 created "2023-10-13" @default.
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- W4387563583 date "2023-10-12" @default.
- W4387563583 modified "2023-10-13" @default.
- W4387563583 title "Adaptability to Eccentric Exercise Training is Diminished with Age in Female Mice" @default.
- W4387563583 doi "https://doi.org/10.1152/japplphysiol.00428.2023" @default.
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