Chronic exercise preserves lean muscle mass in masters athletes.
Level 4 - case-series / case-control
Cross-sectional observational study
PubMed 22030953 · doi:10.3810/psm.2011.09.1933
What was done
A cross-sectional study evaluated 40 high-level recreational masters athletes aged 40 to 81 years who trained 4 to 5 times per week. Investigators assessed body composition, quadriceps peak torque (PT), and bilateral quadriceps magnetic resonance imaging (MRI). Medical image processing software quantified mid-thigh muscle area, quadriceps area (QA), subcutaneous adipose tissue, and intramuscular adipose tissue from MRI scans. Differences across age groups were tested with one-way ANOVA, and relationships were evaluated using Spearman correlations.
What was found
Total body fat percentage increased with age (P = 0.003). Mid-thigh muscle area (P = 0.12), QA (P = 0.17), and quadriceps PT did not decline with age. Specific strength (PT per QA) also showed no significant decline with age (P = 0.06). As muscle area increased, PT increased significantly (P = 0.008). PT was not significantly related to intramuscular adipose tissue (P = 0.71) or total lean mass (P = 0.4). Total lean mass was significantly related to retention of mid-thigh muscle area (P < 0.0001), while mid-thigh muscle area (P = 0.31) and lean mass (P = 0.15) did not increase with age.
Why it matters
This study suggests that age-associated losses of muscle mass and strength may largely be driven by chronic physical disuse rather than obligatory biological aging.
Limits
The study is limited by a small cross-sectional sample (n = 40) that cannot establish causality or track individual trajectories over time. The cohort consists exclusively of highly active masters athletes, limiting generalizability to the wider aging population. The abstract reports p-values but lacks absolute values, effect sizes, and a sedentary control group for direct comparison.
Cited by
- supports Master athletes who remain physically active in their 50s, 60s, 70s, and 80s can attenuate most age-related muscle loss.