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Compositional Influence of Movement Behaviours on Bone Health during Ageing.

INTRODUCTION AND PURPOSE: Physical activity (PA) is considered the best non-pharmacological treatment for the decrease in bone mass (BM) produced during ageing. Therefore, it is essential to assess how the time spent in PA is distributed in order to control further changes. This work examines the relationship between movement behaviours and BM during ageing, using compositional data analysis.

METHODS: We studied 227 older people aged 65 to 94 (102 men and 125 women) divided by sex and bone status, over a period of 4 years. Time spent in sedentary behaviour (SB), light PA (LPA) and moderate-to-vigorous PA (MVPA), was assessed using accelerometry. BM was determined by dual-energy X-ray absorptiometry.

RESULTS: The changes in MVPA was positively associated with the rate of BM decay at spine and leg in the whole sample and men's subgroup (p≤0.05). In women, the rate of BM decay at spine and Ward's triangle were negatively associated with SB changes and BM decay at femoral neck and Ward's was positively associated with LPA (p≤0.05).

CONCLUSION: Increasing MVPA related to other movement behaviours produces improvements in the rate of bone change in older men; while to increase LPA and maintain MVPA would be the best approach to enhance bone mass in older women.

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