Hormonal
Reducing daily step count by approximately 76% for 14 days in healthy elderly adults induces leg lean mass loss and blunts postprandial myofibrillar protein synthesis (anabolic resistance).
For older adults, maintaining habitual daily activity levels is critical even during short periods of illness or recovery. A significant drop in daily steps (e.g., by 75%) for just two weeks can lead to measurable muscle loss and metabolic issues. Do not assume that minor reductions in activity are harmless; consistency in daily movement helps preserve muscle mass and metabolic health.
The present study demonstrates that 14 days of reduced steps in older adults induces small but measurable reductions in muscle mass that appear to be underpinned by reductions in postprandial MPS and are accompanied by impairments in insulin sensitivity and systemic inflammatory markers and postprandial MPS.
Why this rating
Randomized controlled trial design with objective measures (DXA, stable isotopes) in a specific population, though small sample size (n=10).
Source
Two Weeks of Reduced Activity Decreases Leg Lean Mass and Induces “Anabolic Resistance” of Myofibrillar Protein Synthesis in Healthy Elderly
Leigh Breen et al. · The Journal of Clinical Endocrinology & Metabolism · 2013
DOI 10.1210/jc.2013-1502
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