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Body composition is associated with physical activity in daily life as measured using a triaxial accelerometer in both men and women.
2008 (English)In: International Journal of Obesity, ISSN 0307-0565, E-ISSN 1476-5497, Vol. 32, no 8Article in journal (Refereed) Published
Abstract [en]

BACKGROUND: Activity-related energy expenditure is the most variable component of total energy expenditure and thus an important determinant of energy balance.

OBJECTIVE: To determine whether body composition is related to physical activity in both men and women.

DESIGN: A total of 134 healthy participants were recruited (80 women, 54 men; aged 21+/-2 years; body mass index, 22.0+/-2.4). Physical activity was measured for a period of 2 weeks using a triaxial accelerometer for movement registration (Tracmor). Percentage body fat (%BF) was determined by underwater weighing and deuterium dilution according to Siri's three-compartment model.

RESULTS: The participant characteristics-body mass, height and gender together explained a substantial part of the variation in %BF (R(2)=0.75, SEE=4.0%). Adding physical activity to the model increased the explained variation in %BF with 4% (R(2)=0.79, SEE=3.7%, P<0.001). Taking seasonality into account by adding the number of daylight hours as an independent variable further increased the explained variation with 1% (R(2)=0.80, SEE=3.7%, P<0.05). In analogy, the association was evaluated for both genders separately. In women, %BF and physical activity were significantly associated (P<0.001). In men, %BF was only associated with physical activity when seasonality was taken into account as well (P<0.05). This probably resulted from men participating more in season bound sports, because an association was found without adjusting for seasonality when only men with a consistent year-round participation in sports were considered.

CONCLUSION: Evidence was found for an association between body composition and physical activity in both genders. A consistent year-round degree of physical activity appears to be a prerequisite to reveal the association. Moreover, Tracmor-assessed physical activity improves the estimate of %BF when a participant's characteristics are taken into account.

Place, publisher, year, edition, pages
2008. Vol. 32, no 8
National Category
Medical and Health Sciences
URN: urn:nbn:se:uu:diva-278399DOI: 10.1038/ijo.2008.72PubMedID: 18504444OAI: oai:DiVA.org:uu-278399DiVA: diva2:906502
Available from: 2016-02-24 Created: 2016-02-24 Last updated: 2016-02-24

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