Elderly resistance training

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Vitamin D
For older adults who train, vitamin D is more like the material that lets training work: low vitamin D impairs muscle function and is linked with falls, so a deficiency should be corrected, but vitamin D on its own cannot replace training. In Fiatarone 1994, older people who took a nutritional supplement without training did not improve on the main outcomes.
Bone
When older adults do strength training, contracting muscles pull on bone and give it a mechanical signal to remodel. Liu 2009 pooled 121 randomized trials: progressive strength training clearly improved strength and mobility in older adults, the very old and frail included; how much bone density rises is a question for trials that measure bone directly.

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Frail elders can regain strength

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Can nursing-home residents in their eighties and nineties, who struggle even to walk, still train their muscles back? Yes. That is the conclusion of a classic randomized trial.

Fiatarone 1994, published in the New England Journal of Medicine (NEJM), enrolled 100 frail nursing-home residents with an average age of 87, most living with several chronic diseases. They were randomly assigned to four groups: high-intensity progressive resistance training, a nutritional supplement, both, or neither. The training groups worked their legs at 80% of (80% of the heaviest weight they could lift in one full repetition), 3 times a week for 10 weeks.

The results: muscle strength in the training groups rose by an average of 113%, while those who did not train barely changed (3%). Stair-climbing power rose by about 28% and walking speed by about 12%. Taking the supplement without training improved none of the main outcomes.

What the trial pinned down is one sentence: frailty is not fate. With enough stimulus and someone supervising, muscles close to 90 years old still respond to training, and a Cochrane systematic review by Liu 2009, which pooled more than a hundred randomized trials, points the same way. That does not mean anyone can go straight to heavy weights: if chest pain, fainting, unusual breathlessness, or swelling and pain in one calf appear during training, stop at once and seek medical care.

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Educational content, not medical advice — consult a clinician.

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