Mixed
A sedentary lifestyle in older adults causes mitochondrial dysfunction, reduced oxidative capacity, and chronic systemic inflammation, whereas a recreationally active lifestyle preserves these parameters and mitigates age-related sarcopenia.
If you are an older adult, maintaining a recreationally active lifestyle (e.g., walking, gardening, cycling 3+ times a week) is critical for preserving muscle strength and mitochondrial health. Sedentary behavior, even if due to joint pain like osteoarthritis, accelerates mitochondrial dysfunction and inflammation. Prioritize consistent, moderate physical activity to counteract age-related decline.
We show that a physically active lifestyle is associated with the partial compensatory preservation of mitochondrial biogenesis, and cellular oxidative and antioxidant capacity in skeletal muscle of older adults. Conversely a sedentary lifestyle... is associated with reduced mitochondrial function, dysregulation of cellular redox status and chronic systemic inflammation...
Why this rating
Cross-sectional study with clear group differentiation (Young, Active Old, Sedentary Old) and robust biochemical markers, but lacks longitudinal intervention data.
Source
Aberrant Mitochondrial Homeostasis in the Skeletal Muscle of Sedentary Older Adults
Adeel Safdar et al. · PLoS ONE · 2010
DOI 10.1371/journal.pone.0010778
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