Longer objective sleep duration, higher sleep efficiency, and stronger relative amplitude were independently associated with a lower risk of incident osteoporosis in a large prospective cohort study.
Longer average sleep duration was associated with a significantly reduced risk of incident osteoporosis.
Higher sleep efficiency was associated with a significantly reduced risk of incident osteoporosis.
Stronger relative amplitude (a measure of rest-activity rhythmicity) was associated with a substantially reduced risk of incident osteoporosis.
Sleep regularity index and sleep midpoint were not reported as significantly associated with osteoporosis risk in the main analysis.
A significant negative interaction was found between relative amplitude and sleep duration in relation to osteoporosis risk.
Sex-stratified analyses revealed that in women the associations mirrored the main analysis, while in men only sleep duration and relative amplitude were significantly associated with lower osteoporosis risk.
The study included 72,211 UK Biobank participants who provided 7 consecutive days of wrist accelerometer data, with incident osteoporosis identified through linkage with electronic medical records.
This research suggests that how well and how long people sleep — measured objectively using wrist-worn activity trackers — is linked to their likelihood of developing osteoporosis (a disease that weakens bones). Using data from over 72,000 UK Biobank participants tracked over time, researchers found that people who slept longer, slept more efficiently, and had stronger day-night activity rhythms were meaningfully less likely to develop osteoporosis. Importantly, rather than relying on people's own reports of their sleep, the study used seven days of continuous wrist accelerometer recordings to capture objective sleep patterns across multiple dimensions. One particularly notable finding is that 'relative amplitude' — a measure of how distinctly a person's activity is concentrated in the daytime versus nighttime — showed the strongest association with lower osteoporosis risk, with people in higher relative amplitude categories having about 20% lower risk. The study also found that the protective association of longer sleep duration was influenced by a person's relative amplitude level, suggesting these sleep dimensions interact with each other. When results were broken down by sex, women showed associations across sleep duration, efficiency, and relative amplitude, while in men only sleep duration and relative amplitude remained statistically significant. This research suggests that multiple dimensions of sleep health, particularly the contrast between rest and activity across the day-night cycle, may be relevant to bone health and osteoporosis risk. However, the authors caution that this is an observational study and cannot prove that poor sleep causes osteoporosis — further research is needed to understand the underlying mechanisms and whether improving sleep could actually reduce osteoporosis risk.
Upload your bloodwork. We'll cross-reference your results against this study and 4,700 others.
Upload Your LabsHu Z, Wang G, Kong X, Jia J, Zhao M, Deng J, et al.. (2026). Association of accelerometer-derived sleep characteristics with incident osteoporosis: a prospective cohort study from the UK Biobank.. Frontiers in endocrinology. https://doi.org/10.3389/fendo.2026.1818773