Relations of diet and physical activity to bone mass and height in black and white adolescents

Hdl Handle:
http://hdl.handle.net/10675.2/748
Title:
Relations of diet and physical activity to bone mass and height in black and white adolescents
Authors:
Gutin, Bernard; Stallmann-Jorgensen, Inger S.; Le, Anh H.; Johnson, Maribeth H.; Dong, Yanbin
Abstract:
Because the development of healthy bodies during the years of growth has life-long health consequences, it is important to understand the early influences of diet and physical activity (PA). One way to generate hypotheses concerning such influences is to conduct cross-sectional studies of how diet and PA are related to different components of body composition. The subjects were 660 black and white adolescents. Total body bone mineral content (BMC) was measured with dual-energy X-ray absorptiometry; free-living diet and PA were assessed with 4â 7 separate 24-h recalls. The main dietary variables investigated were: total energy intake, macronutrient distribution (%), dairy servings, vitamin D, and calcium. The main PA variables were hours of moderate PA (3â 6 METs) and vigorous PA (>6 METs). BMC was higher in blacks than in whites (P<0.01) and it increased more in boys than in girls (age by sex interaction) as age increased (P<0.01). After adjustment for age, race and sex, higher levels of BMC were associated with higher levels of energy intake, dairy servings, calcium, vitamin D, and vigorous PA (all P 's<0.05). In the multivariable model, significant and independent proportions of the variance in BMC were explained by race, the age by sex interaction, calcium, and vigorous PA (all P 's<0.01). When height was used as the outcome variable, similar diet results were obtained; however, there was a sex by vigorous PA interaction, such that vigorous PA was associated with height only in the girls. These data are consistent with the hypothesis that the bone mass and height of growing youths are positively influenced by higher dietary intake of energy and dairy foods, along with sufficient amounts of vigorous PA. This hypothesis needs to be tested in randomized controlled trials.; Key words
Citation:
Pediatr Rep. 2011 Jun 16; 3(2):e10
Issue Date:
16-Jun-2011
URI:
http://hdl.handle.net/10675.2/748
DOI:
10.4081/pr.2011.e10
PubMed ID:
21772947
PubMed Central ID:
PMC3133492
Type:
Article
ISSN:
2036-7503
Appears in Collections:
Georgia Prevention Center: Faculty Research and Presentations

Full metadata record

DC FieldValue Language
dc.contributor.authorGutin, Bernarden_US
dc.contributor.authorStallmann-Jorgensen, Inger S.en_US
dc.contributor.authorLe, Anh H.en_US
dc.contributor.authorJohnson, Maribeth H.en_US
dc.contributor.authorDong, Yanbinen_US
dc.date.accessioned2012-10-26T20:27:55Z-
dc.date.available2012-10-26T20:27:55Z-
dc.date.issued2011-06-16en_US
dc.identifier.citationPediatr Rep. 2011 Jun 16; 3(2):e10en_US
dc.identifier.issn2036-7503en_US
dc.identifier.pmid21772947en_US
dc.identifier.doi10.4081/pr.2011.e10en_US
dc.identifier.urihttp://hdl.handle.net/10675.2/748-
dc.description.abstractBecause the development of healthy bodies during the years of growth has life-long health consequences, it is important to understand the early influences of diet and physical activity (PA). One way to generate hypotheses concerning such influences is to conduct cross-sectional studies of how diet and PA are related to different components of body composition. The subjects were 660 black and white adolescents. Total body bone mineral content (BMC) was measured with dual-energy X-ray absorptiometry; free-living diet and PA were assessed with 4â 7 separate 24-h recalls. The main dietary variables investigated were: total energy intake, macronutrient distribution (%), dairy servings, vitamin D, and calcium. The main PA variables were hours of moderate PA (3â 6 METs) and vigorous PA (>6 METs). BMC was higher in blacks than in whites (P<0.01) and it increased more in boys than in girls (age by sex interaction) as age increased (P<0.01). After adjustment for age, race and sex, higher levels of BMC were associated with higher levels of energy intake, dairy servings, calcium, vitamin D, and vigorous PA (all P 's<0.05). In the multivariable model, significant and independent proportions of the variance in BMC were explained by race, the age by sex interaction, calcium, and vigorous PA (all P 's<0.01). When height was used as the outcome variable, similar diet results were obtained; however, there was a sex by vigorous PA interaction, such that vigorous PA was associated with height only in the girls. These data are consistent with the hypothesis that the bone mass and height of growing youths are positively influenced by higher dietary intake of energy and dairy foods, along with sufficient amounts of vigorous PA. This hypothesis needs to be tested in randomized controlled trials.en_US
dc.description.abstractKey wordsen_US
dc.rights©Copyright B. Gutin et al., 2011en_US
dc.titleRelations of diet and physical activity to bone mass and height in black and white adolescentsen_US
dc.typeArticleen_US
dc.identifier.pmcidPMC3133492en_US
dc.contributor.corporatenameGeorgia Institute for Prevention of Human Diseases and Accidents-

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