Summary: In a 12-week randomised trial of 100 sufficiently active adults aged 55 to 75 with type 2 diabetes (four arms of 25), all exercise programmes improved subjective sleep (Pittsburgh Sleep Quality Index), but only combined aerobic plus resistance training improved objective sleep measures (total sleep time, sleep efficiency, wake after sleep onset) and reduced visceral adipose tissue, insulin resistance (HOMA-IR) and HbA1c. The abstract reports the direction of effects but provides no effect sizes, confidence intervals or p-values.
PICO Summary
| Element | Detail |
|---|---|
| Population | 100 sufficiently active, physically fit adults aged 55 to 75 with type 2 diabetes (52 women, 48 men); single-centre randomised controlled trial, China. |
| Intervention | Combined aerobic plus resistance exercise (COMB) over 12 weeks, with sleep monitored by a wrist smart bracelet; n = 25. |
| Comparison | Three parallel arms of n = 25 each: no-exercise control, aerobic exercise only (AEX), and resistance exercise only (REX). |
| Outcome | All three exercise arms improved the PSQI global score versus control. Only COMB improved objective sleep (total sleep time, sleep efficiency, wake after sleep onset) and reduced visceral adipose tissue, HOMA-IR and HbA1c. The published abstract reports the direction of these between-group differences only; no effect estimates, 95% confidence intervals, p-values, absolute risk reduction or number needed to treat are stated, so the magnitude of benefit cannot be quantified from the abstract. No adverse events were reported. |
Expert Commentary
This randomised trial offers a plausible signal that pairing aerobic with resistance training does more for sleep and central adiposity in older adults with type 2 diabetes than either mode alone, and the internal logic linking visceral fat reduction to better objective sleep is biologically coherent. The verdict, however, must stay cautious: the abstract describes only the direction of effects and reports no effect sizes, confidence intervals or p-values, so the size and precision of any benefit are unknown from the available data. The single most weighing limitation is the small sample, with roughly 25 participants per arm across many compared outcomes, which invites both chance findings and an inability to detect modest true differences. An exercise intervention also cannot be blinded, so the subjective PSQI improvement across all active arms is vulnerable to expectation effects, which is one reason the objective accelerometry-derived sleep measures matter more here. Enrolment was restricted to already active, physically fit older adults at one centre, limiting generalisability to deconditioned or frailer patients. Can I use this with my patients? Cautiously yes for counselling: a fit, motivated 60-year-old with type 2 diabetes can reasonably be encouraged to combine aerobic and resistance work for general metabolic and sleep benefit, but this trial does not license promising a specific sleep or fat-loss figure. Larger, fully reported trials with prespecified objective sleep endpoints are needed before the combined-training advantage can be considered established.
References
Han Y, Han YX, Huang F, Zou HM, Gu Q, Hu X, et al. The relationship between abdominal fat and sleep quality after combined exercise in patients with type 2 diabetes mellitus. Front Endocrinol (Lausanne). 2025;16:1471608. doi:10.3389/fendo.2025.1471608
