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Musculoskeletal BODY HANDBOOK
Musculoskeletal ยท ยง160
Muscle Loss with Aging (Sarcopenia)
The fall that ends an older person's independence is usually a leg that couldn't catch the body, not a broken bone. From your late thirties your muscle fades about 1% a year and your strength three times faster; by 70 the sedentary can't rise from a low chair without their arms. The fix is older than the gym: lift heavy twice a week, eat enough protein. That machinery never switches off, even at 90, and the people who use it move a decade younger.
Condition Evidence Strong Chapter Musculoskeletal

Strength goes before size, and that's the dangerous part. The fast-twitch fibers that rise you out of a chair and catch a stumble waste first 1. Old muscle is also harder to feed: it needs roughly double the protein per meal to trigger the same growth 2. And illness compounds it fast: ten days of bed rest cost healthy 67-year-olds a kilo of leg muscle 3.

It reverses at any age. Ten nursing-home residents, average age 90, did eight weeks of heavy leg training and got 174% stronger; two put down their canes 4. That holds across 121 pooled trials in adults over 60: more strength, faster gait, quicker chair-rise, at every frailty level 5. Enough protein roughly doubles it 6.

Strong people simply die less. Across 140,000 adults, grip strength predicted death better than blood pressure did; each 5 kg drop tracked a 16% higher death rate 7. At equal muscle mass, the stronger person still outlives the weaker 8.

Two inputs: lift, and eat enough protein to build what you lift.

Two cheap adjuncts: creatine at 3โ€“5 g a day adds about 1.4 kg of lean mass for ~$30 a year 11; if your vitamin D is low, 800โ€“1,000 IU a day cuts falls about 19% 12.

Three rungs, on this timeline.

  • Weeks 1โ€“6: you feel stronger before you look bigger. Stairs stop winding you, groceries go up in one trip.
  • Months 2โ€“6: the muscle catches up. Posture straightens, shoulders fill out, chair-rise and gait speed climb 5.
  • Years on: you take the stairs without the rail, get off the floor without thinking, and skip the medication cascade sarcopenia drags behind. At 70, people guess 60.
The fine print โ€” when to skip it, and what people get wrong

"Walking is enough." Your legs already carry your weight; muscle grows only under a heavier load, so walkers lose strength at the sedentary rate 13. Walk for everything else; lift for muscle.

"It's too late" / "protein wrecks old kidneys." 90-year-olds gained 174% 4; the kidney fear is extrapolated from kidney-disease diets and was never shown in normal renal function 10.

The weight never getting heavier, and protein too low or bunched into one meal, are the two failures that quietly waste the effort. And a long break after illness compounds fast, so start rebuilding deliberately the day the bed rest ends.

Get uncontrolled high blood pressure or a recent heart event cleared by a clinician before starting; train around an active joint flare or fresh fracture. If you have moderate-to-severe kidney disease, your nephrologist sets the protein target.

References
  1. 1Lexell J et al. (1988). What is the cause of the ageing atrophy? Total number, size and proportion of different fiber types studied in whole vastus lateralis muscle from 15- to 83-year-old men. Journal of the Neurological Sciences. link
  2. 2Moore DR et al. (2015). Protein ingestion to stimulate myofibrillar protein synthesis requires greater relative protein intakes in healthy older versus younger men. Journals of Gerontology Series A. link
  3. 3Kortebein P et al. (2007). Effect of 10 days of bed rest on skeletal muscle in healthy older adults. JAMA. link
  4. 4Fiatarone MA et al. (1990). High-intensity strength training in nonagenarians. Effects on skeletal muscle. JAMA. link
  5. 5Liu CJ, Latham NK (2009). Progressive resistance strength training for improving physical function in older adults. Cochrane Database of Systematic Reviews. link
  6. 6Cermak NM et al. (2012). Protein supplementation augments the adaptive response of skeletal muscle to resistance-type exercise training: a meta-analysis. American Journal of Clinical Nutrition. link
  7. 7Leong DP et al. (2015). Prognostic value of grip strength: findings from the Prospective Urban Rural Epidemiology (PURE) study. The Lancet. link
  8. 8Newman AB et al. (2006). Strength, but not muscle mass, is associated with mortality in the health, aging and body composition study cohort. Journals of Gerontology Series A. link
  9. 9Reid KF, Fielding RA (2012). Skeletal muscle power: a critical determinant of physical functioning in older adults. Exercise and Sport Sciences Reviews. link
  10. 10Bauer J et al. (2013). Evidence-based recommendations for optimal dietary protein intake in older people: a position paper from the PROT-AGE study group. Journal of the American Medical Directors Association. link
  11. 11Devries MC, Phillips SM (2014). Creatine supplementation during resistance training in older adults โ€” a meta-analysis. Medicine and Science in Sports and Exercise. link
  12. 12Bischoff-Ferrari HA et al. (2009). Fall prevention with supplemental and active forms of vitamin D: a meta-analysis of randomised controlled trials. BMJ. link
  13. 13Goodpaster BH et al. (2006). The loss of skeletal muscle strength, mass, and quality in older adults: the Health, Aging and Body Composition Study. Journals of Gerontology Series A. link
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