The time of day you do resistance training does not change the result

Design

Three-arm, single-centre, double-blind randomised controlled trial

Population

108 older adults (93 analysed; mean age 67) over a 12-week programme

Primary outcome

Isometric midthigh pull strength (peak vs trough timing)

Effect

Peak vs trough near zero across outcomes (e.g. midthigh pull 0.06 N/kg, 95% CI −0.76 to 0.88)

Physical performance varies across the day, prompting the idea that older adults might gain more by training at their personal peak time. This three-arm randomised trial tested it, first mapping each participant's peak and trough performance times, then assigning them to train at their peak, at their trough, or not at all for 12 weeks.

Across strength and lean-mass outcomes, training at the peak time gave no advantage over the trough time — every effect estimate sat near zero with confidence intervals spanning it. Resistance training worked, as expected, but when in the day it was done made no measurable difference.

The practical message simplifies advice. Do not add the complexity of chronotyping or insist an older patient train at a particular hour; what counts is that they do supervised, progressive resistance training at all, at whatever time they will actually adhere to. Removing a spurious barrier helps uptake.

• Training at the individual's peak time gave no advantage over the trough time on strength or lean mass.
• All peak-versus-trough effect estimates were near zero with confidence intervals crossing zero.
• Resistance training itself remained the effective intervention against sarcopenia.
• Advise older patients to train at whatever time they will adhere to, not a prescribed 'optimal' hour.

Why it matters

It removes a spurious barrier — the idea that exercise must be timed — that could otherwise reduce adherence.

Don't overread it

A single-centre trial of 93 analysed participants; it addresses timing, not the well-established benefit of resistance training.

The statistics, in plain English

Effect estimates near zero with intervals crossing zero mean no detectable difference between peak and trough timing. This is a clean negative that simplifies the prescription rather than a failure to find an effect of training itself.

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