Low-load resistance exercise during inactivity is associated with greater fibre area and satellite cell expression in older skeletal muscle.

Background Age-related sarcopenia is accelerated by physical inactivity. Low-load resistance exercise (LLRE) counters inactivity-induced muscle atrophy in older adults, but changes in muscle fibre morphology are unstudied. We aimed to determine the impact of LLRE during short-term inactivity (step-reduction) on muscle fibre size and capillarity as well as satellite cell (SC) content in older skeletal muscle. Methods Fourteen older (similar to 71years) male adults underwent 14days of step reduction (<1500 steps/day) while performing six sessions of LLRE (similar to 30% maximal strength) with one leg (SR+EX) while the contralateral leg served as an untrained control (SR). Seven healthy ambulatory age-matched male adults (similar to 69years) served as a comparator group (COM). Muscle biopsies were taken from the vastus lateralis after 14days, and immunohistochemical analysis was performed to determine muscle fibre cross-sectional area (CSA), myonuclear content, SC content (PAX7(+) cells), and total (C:F) and fibre type-specific (C:Fi) capillary-to-fibre ratios. Results Type I and II fibre CSA was greater in SR+EX compared with SR. Whereas there were no differences across fibre types between SR+EX and CON, type II fibre CSA was significantly lower in SR compared with COM. Type II myonuclear domain was greater in SR+EX compared with COM and SR. Pax7(+) cells associated with type I and II fibres were lower in SR compared with SR+EX. Type II PAX7+ cells were also lower in SR compared with COM with a similar trend for type I fibres. There were trends for a lower C:Fi in SR compared with SR+EX for both fibre types with no differences for each compared with COM. Conclusions Minimal LLRE during a period of decreased physical activity is associated with greater muscle fibre CSA, SC content, and capillarization. These results support the use of LLRE as an effective countermeasure to inactivity-induced alterations in muscle morphology with age.