Mixed
Short-term step reduction (<1000 steps/day) in older adults triggers rapid metabolic perturbations indicating muscle energy decline and protein degradation, which are not fully reversible after two weeks of resumed normal activity.
If you are an older adult, even a short break from your normal walking routine (less than 1,000 steps a day) can trigger metabolic changes in your muscles that suggest protein breakdown. These changes don't always bounce back quickly when you start moving normally again. To protect your muscle health, try to maintain a baseline level of daily movement rather than taking long breaks, especially if you are already at risk for metabolic issues.
Two weeks of step reduction elicited increases in circulatory metabolites associated with a decline in muscle energy metabolism and protein degradation, including glutamine, carnitine and creatine... Our results indicate that older persons are susceptible to metabolic perturbations due to short-term step reduction that were not fully reversible with resumption of normal ambulatory activity over the same time period.
Why this rating
Randomized controlled trial design with metabolomic profiling, though small sample size (n=17) and specific population (pre-diabetic older adults) limit generalizability.
Source
Metabolic Perturbations from Step Reduction in Older Persons at Risk for Sarcopenia: Plasma Biomarkers of Abrupt Changes in Physical Activity
Michelle Saoi et al. · Metabolites · 2019
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