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BMC Public Health

, 12:971

Health behavior, health promotion and society


BackgroundWe aimed to examine whether time spent on different sedentary behaviours is associated with bone mineral content BMC in adolescents, after controlling for relevant confounders such as lean mass and objectively measured physical activity PA, and if so, whether extra-curricular participation in osteogenic sports could have a role in this association.

MethodsParticipants were 359 Spanish adolescents 12.5-17.5 yr, 178 boys, from the HELENA-CSS 2006–07. Relationships of sedentary behaviours with bone variables were analysed by linear regression. The prevalence of low BMC at least 1SD below the mean and time spent on sedentary behaviours according to extracurricular sport participation was analysed by Chi-square tests.

ResultsIn boys, the use of internet for non-study was negatively associated with whole body BMC after adjustment for lean mass and moderate to vigorous PA MVPA. In girls, the time spent studying was negatively associated with femoral neck BMC. Additional adjustment for lean mass slightly reduced the negative association between time spent studying and femoral neck BMC. The additional adjustment for MVPA did not change the results at this site. The percentage of girls having low femoral neck BMC was significantly smaller in those participating in osteogenic sports ≥ 3 h-week than in the rest, independently of the cut-off selected for the time spent studying.

ConclusionsThe use of internet for non-study in boys and the time spent studying in girls are negatively associated with whole body and femoral neck BMC, respectively. In addition, at least 3 h-week of extra-curricular osteogenic sports may help to counteract the negative association of time spent studying on bone health in girls.

KeywordsBone health Sedentary behaviours Adolescents Physical activity and extra-curricular participation in sports Electronic supplementary materialThe online version of this article doi:10.1186-1471-2458-12-971 contains supplementary material, which is available to authorized users.

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Autor: Luis Gracia-Marco - Juan P Rey-López - Alba M Santaliestra-Pasías - David Jiménez-Pavón - Ligia E Díaz - Luis A Mor


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