Physical activity intensity in adolescence and bone density
Evidence indicates that optimization of the genetic potential for bone increment in the first few decades of life may reduce the risk of osteoporosis. This optimization includes modification of lifestyle factors such as nutrition and physical activity levels. Measured levels of bone mineral density (BMD) and bone mass content (BMC) are indicators of bone strength, and are correlated with fracture risk.
Iincreasing physical activity levels reported as days a week were positively associated with BMD and BMC in both sexes.
Girls reporting moderately activity had higher BMD and BMC levels at femoral neck compared to girls who reported themselves as being seldom active. Girls reporting high frequencies of training showed increased BMD and BMC at femoral neck even further.BMC levels at total hip and total body were not significantly increased in girls reported moderate activity compared to those reported seldom activity, however the highly active group had a increase at these sites respectively.
Boys who reported themselves highly active had higher BMD levels than their more seldom active peers at femoral neck, total hip and total body respectively. BMC levels increased comparing seldom to moderate and seldom to highly active boys at all sites
The study supports the suggestion that there is a dose response relationship between activity and bone mass. In Norwegian adolescents, The scholars reporting activity outside school already had a possible head start in reaching an optimal peak bone mass compared to the respondents living a more sedentary life., High levels of activity frequencies and intensity appeared to magnify the effect on BMD and BMC levels in both sexes, adjusted for anthropometric and lifestyle, known to be significantly associated with bone mass, these effects were preserved.
The study showed Increased level of physical activity levels were associated with higher BMD and BMC levels in adolescent for both sexes.
> From: Christoffersen, BMC Sports Sci Med Rehabil 7 (2015) 26. All rights reserved to The Author(s). Click here for the Pubmed summary.