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Abstract
BackgroundPhysical activity is known to benefit many physiological processes, including bone turnover. There are; however, currently no clinical guidelines regarding the most appropriate type, intensity and duration of activity to prevent bone loss.MethodsTo help address this gap in the literature, we performed a retrospective analysis of data from the Canadian Multicentre Osteoporosis Study (CaMos), a prospective cohort of 9423 adult patients, to determine the relationship between the amount of regular daily physical activity performed and bone mineral density. A total of 1169 female participants aged 75 and over provided information regarding their daily activity levels, including the amount of time spent each week performing physical activity at varying levels of intensity. Multiple and linear regression analyses were used to determine the effect of increasing amounts of this regular physical activity on bone mineral density.ResultsThe results indicate that a step increase in the amount of physical activity performed each day resulted in a positive effect on bone mineral density at the hip, Ward’s triangle, trochanter and femoral neck (B = 0.006 to 0.008, p < 0.05). Possible confounding factors such as the use of anti-resorptive therapy, body mass index and age were included in the analysis and suggested that age had a negative effect on bone density while body mass index had a positive effect. Anti-resorptive therapy provided a protective effect against loss of bone density.ConclusionsThe data indicate that a step increase in the amount of daily activity, using simple, daily performed tasks, can help prevent decreases in post-menopausal bone mineral density.
Highlights
Physical activity is known to benefit many physiological processes, including bone turnover
The mean Body mass index (BMI) of 26.2 ± 6.5 of participants in this study equates to a classification of “overweight”, according to the World Health Organization classification [17]
The current study sought to determine whether a relationship exists between the amount of regular physical activity performed on a weekly basis and bone mineral density in Canadian women aged 75 and over
Summary
Physical activity is known to benefit many physiological processes, including bone turnover. The issue, from a clinical perspective, is that there are no guidelines available regarding the most appropriate type, intensity and duration of physical activity to best provide protection against bone loss and/or fracture. Howe et al [11] recently completed a large Cochrane review of the effect of physical activity and/or exercise programs on bone density Their findings indicate that, in general, a small, statistically significant protective effect of exercise on bone density was noted in post-menopausal women as compared with control groups. They investigated many different categories of exercise, including those of differing intensity and focus; their findings did not translate into specific recommendations that can be used in clinical practice
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