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A small amount of precisely measured high-intensity habitual physical activity predicts bone health in pre- and post-menopausal women in UK Biobank

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dc.contributor.authorStiles, V.H.
dc.contributor.authorMetcalf, B.S.
dc.contributor.authorKnapp, K.M.
dc.contributor.authorRowlands, A.V.
dc.date.issued2017
dc.description.abstractPhysical inactivity is a highly modifiable risk factor for the development of osteoporosis but, due to a lack of research that has precisely and objectively meaured physical activity (PA) relevant to bone, the specific contribution that PA can make to bone health is poorly understood. This study examined whether a more precise measure of PA relelvant to bone was associated with meaures of bone health in pre- and post-menopausal women in UK Biobank.Time spent at intensities specific to bone health [a parts per thousand<yen>750 milli-gravitational units (mg) and a parts per thousand<yen>1000 mg] were analysed from raw tri-axial acceleration data averaged over 1-second epochs from 7-day monitoring of habitual PA using accelerometry-based activity monitors (100 Hz; AX3, Axivity, UK) of 1218 pre- and 1316 post-menopausal healthy women. In a cross-sectional analysis, associations between categories of time (< 1, 1-2 and a parts per thousand<yen>2 minutes) spent above the intensity thresholds and calcaneal quantitative ultrasound measures of bone health (bone mineral density T-score, BMDT-score; speed of sound, SOS; and broadband ultrasound attenuation, BUA) were examined.Compared with < 1 minute, spending 1-2 or a parts per thousand<yen>2 minutes/day at intensities a parts per thousand<yen>1000 mg in pre-menopausal and a parts per thousand<yen>750 mg in post-menopausal women was positively associated with BMDT-score, SOS and BUA.Brief bursts of high-intensity PA relevant to bone health can be captured by applying bone-specific thresholds of intensity to raw tri-axial accelerations averaged over 1-second epochs. Accumulating 1-2 minutes/day of high-intensity PA, equivalent to running in pre-menopausal women and slow jogging in post-menopausal women, is associated with better bone health.
dc.identifier.citationInternational Journal of Epidemiology, 2017; 46(6):1847-1856
dc.identifier.doi10.1093/ije/dyx080
dc.identifier.issn0300-5771
dc.identifier.issn1464-3685
dc.identifier.urihttps://hdl.handle.net/11541.2/130181
dc.language.isoen
dc.publisherOxford University Press
dc.relation.fundingUK Biobank Resource 10995
dc.relation.fundingUniversity of Exeter Project Development Fund (Science)
dc.rightsCopyright 2017 The Author Access Condition Notes: Accepted manuscript available after 1 July 2018
dc.source.urihttps://doi.org/10.1093/ije/dyx080
dc.subjectosteoporosis
dc.subjectaccelerometer
dc.subjectraw acceleration
dc.subjectquantitative ultrasound
dc.titleA small amount of precisely measured high-intensity habitual physical activity predicts bone health in pre- and post-menopausal women in UK Biobank
dc.typeJournal article
pubs.publication-statusPublished
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ror.mmsid9916169311001831

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