Fulltext

Weight-bearing bones are more sensitive to physical exercise in boys than in girls during pre- and early puberty: a cross-sectional study

Kriemler, S. ; Zahner, L. ; Puder, J. ; Braun-Fahrländer, C. ; Schindler, C. ; Farpour-Lambert, N. ; Kränzlin, M. ; Rizzoli, R.

In: Osteoporosis International, 2008, vol. 19, no. 12, p. 1749-1758

Ajouter à la liste personnelle
    Titre
    • Weight-bearing bones are more sensitive to physical exercise in boys than in girls during pre- and early puberty: a cross-sectional study
    Auteur
    • Kriemler, S.. Institute of Exercise and Health Sciences, University of Basel, Brüglingen 33, 4052, Basel, Switzerland
    • Zahner, L.. Institute of Exercise and Health Sciences, University of Basel, Brüglingen 33, 4052, Basel, Switzerland
    • Puder, J.. Division of Endocrinology, Diabetes and Clinical Nutrition, University Hospital of Basel, Basel, Switzerland
    • Braun-Fahrländer, C.. Institute of Social and Preventive Medicine, University of Basel, Basel, Switzerland
    • Schindler, C.. Institute of Social and Preventive Medicine, University of Basel, Basel, Switzerland
    • Farpour-Lambert, N.. Department of Child and Adolescent Medicine, University Hospitals of Geneva, Geneva, Switzerland
    • Kränzlin, M.. Division of Endocrinology, Diabetes and Clinical Nutrition, University Hospital of Basel, Basel, Switzerland
    • Rizzoli, R.. Service of Bone Diseases (WHO collaborating center for osteoporosis prevention), University Hospitals of Geneva, Geneva, Switzerland
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Osteoporosis International, 2008, vol. 19, no. 12, p. 1749-1758. Springer-Verlag
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:310884
    Summary
    Summary: We carried out a cross-section study of the sex-specific relationship between bone mineral content and physical activity at sites with different loading in pre- and early pubertal girls and boys. There was significant sensitivity of bone mineral content of the hip to physical exercise in boys, but not in girls. Background: Since little is known whether there are sex differences in sensitivity of bone to loading, we investigated sex differences in the cross-sectional association between measures of physical activity (PA) and bone mass and size in pre- and early pubertal children of both sexes. Methods: We measured bone mineral content/density (BMC/BMD) and fat-free mass (FFM) in 269 6- to 13-year-old children from randomly selected schools by dual-energy X-ray absorptiometry. Physical activity (PA) was measured by accelerometers and lower extremity strength by a jump-and-reach test. Results: Boys (n = 128) had higher hip and total body BMC and BMD, higher FFM, higher muscle strength and were more physically active than girls (n = 141). Total hip BMC was positively associated with time spent in total and vigorous PA in boys (r = 0.20-0.33, p < 0.01), but not in girls (r = 0.02-0.04, p=ns), even after adjusting for FFM and strength. While boys and girls in the lowest tertile of vigorous PA (22min/day) did not differ in hip BMC (15.62 vs 15.52g), boys in the highest tertile (72min/day) had significantly higher values than the corresponding girls (16.84 vs 15.71g, p < 0.05). Conclusions: Sex differences in BMC during pre- and early puberty may be related to a different sensitivity of bone to physical loading, irrespective of muscle mass