For frail over-65s, more lifting is not better lifting

Frailty is one of the strongest predictors of losing independence in later life, and resistance training is the leading candidate for reversing or slowing it. But knowing that strength work helps is not the same as knowing how much of it to do: how many sessions a week, how much volume per session, and whether more is always better. For frail and pre-frail people, who tolerate training poorly if it is overdone, the dose question is not academic. This review set out to pin down those dose-response relationships using meta-regression across the available randomised trials.

The researchers systematically reviewed randomised controlled trials of resistance training in frail and pre-frail adults aged 65 and over, pooling 10 trials with 1303 participants. Functional performance was measured through four tests across the included studies: habitual walking speed in five studies, the timed-up-and-go test in three, the Short Physical Performance Battery in three, and the sit-to-stand test in three. Meta-regressions then examined how training frequency and volume related to the size of the improvements, to identify the key programming variables.

Resistance training alone improved sit-to-stand performance and raised Short Physical Performance Battery scores by 2.261 points, a meaningful gain on that test. At least two weekly sessions were required to improve the battery scores, and three sessions appeared to optimise the improvement. Strikingly, higher training volume per exercise and per session reduced the gains. Timed-up-and-go improved only in community-dwelling participants, not in institutionalised ones, and habitual walking speed did not improve compared with non-active controls. No dose-response link was found for sit-to-stand improvements.

The finding that strength training improves function in frail older adults confirms what previous work suggested. The novel and complicating part is the dose-response picture: frequency helped up to three sessions a week, while extra volume within sessions was counterproductive, which cuts against the intuition that more work means more adaptation. The null result for walking speed, and the split between community-dwelling and institutionalised participants, show the benefits are not uniform. How to programme volume precisely for this population remains an open question resting on only 10 trials.

For readers thinking about their own later decades, or helping older relatives now, this is evidence that strength training genuinely restores everyday function in frail and pre-frail people, with regularity mattering more than heroic sessions. The suggestion that overloading individual sessions blunted the gains is a reason to think small and consistent beats big and occasional in this group. It is also a reminder that not everything improves: walking speed stayed put. The pattern of a modest, repeatable dose is the story here, not a specific workout to copy.