Feasibility and Effects on Muscle Function of an Exercise Program for Older Adults

Area of Science:

• Gerontology
• Exercise Physiology
• Muscle Physiology

Background:

• Maintaining muscle mass and function is crucial for older adults' independence and quality of life.
• Age-related muscle loss (sarcopenia) and decreased physical function increase fall risk and disability.
• Exercise interventions are vital for mitigating age-related functional decline.

Purpose of the Study:

• To assess the feasibility and compliance of a 3-month exercise intervention in adults aged 70 years and older.
• To determine if peripheral quantitative computed tomography (pQCT) and jumping mechanography can detect changes in muscle mass and function.
• To compare the effects of a combined walking and exercise program versus walking alone on muscle measures and function.

Main Methods:

• A parallel-group, nonblinded pilot trial randomized 94 individuals (≥70 years) into a walking-only (WALK) or a walking plus balance and strength exercises (W + EX) group.
• Both groups received weekly nutrition education. Muscle composition, density, intramuscular adipose tissue, and function were assessed pre- and post-intervention using dual-energy x-ray, pQCT, functional tests, and mechanography.
• Feasibility was assessed by enrollment and completion rates (90% completed). Compliance was measured by nutrition session attendance (86%) and exercise log return (66%).

Main Results:

• Both groups showed improvements in lean mass and reductions in fat mass and percentage. Intramuscular adipose tissue decreased and muscle density increased in the WALK group.
• The W + EX group demonstrated significantly greater improvements in jump force efficiency (5.9% vs -1.2%) and chair-rise power (0.25 vs -0.37 W·kg) compared to the WALK group.
• Per-protocol analysis revealed more pronounced differences in mechanography results, suggesting adherence influences outcomes.

Conclusions:

• The combined exercise program (W + EX) is feasible and well-accepted in older adults, showing high compliance rates.
• While both groups improved, the W + EX intervention led to superior gains in muscle function, particularly jump force efficiency and power.
• Further investigation in larger trials is warranted to determine if these functional improvements translate to reduced fall rates in older populations.