Muscle strength and soccer practice as major determinants of bone mineral density in adolescents - 30/06/12
, Elisa Marques b, João Brito a, Peter Krustrup c, d, Sandra Abreu b, José Oliveira b, Carla Rêgo e, f, Jorge Mota b, António Rebelo a
Corresponding author. Faculdade de Desporto, Universidade do Porto, R. Dr. Plácido Costa, 91, 4200 450 Porto, Portugal. Tel.: +35 122 507 4771; fax: +35 122 550 0689.Bienvenue sur EM-consulte, la référence des professionnels de santé.
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Abstract |
Objectives |
To analyse the relationship between isokinetic strength of the lower limb muscles and bone mineral density and content (BMD, BMC) of adolescent male soccer players and age-matched controls not involved in sport (12–15years).
Methods |
A random sample of 151 young males was divided into soccer players (SG; n=117) and control subjects (CG; n=34). Peak torque of knee extensors (PTE) and flexors (PTF) was measured during isokinetic knee joint movement (90°/s) of the dominant and non-dominant lower limbs. BMD and BMC of the whole-body, lumbar spine, dominant/non-dominant lower limb were determined by dual-energy X-ray absorptiometry. Physical activity was monitored with accelerometers during 5 days. Estimated maturity offset was used as an indicator of biological maturity status.
Results |
Whole-body BMD (1.03±0.01 vs. 0.98±0.01g/cm2, P=0.003) and dominant (1.09±0.01 vs. 1.02±0.01g/cm2, P<0.001) and non-dominant (1.09±0.01 vs. 1.01±0.01g/cm2, P<0.001) lower limb BMD was greater in SG compared to CG. No significant differences were found for BMC. Compared to CG, SG performed better in the YY-IE2 test (780±40 vs. 625±31m), exhibited higher PTE (dominant limb: 155.2±30.3 vs. 123.4±37.0N m; non-dominant limb: 156.2±36.1 vs. 120.4±41.1N m) and PTF muscles (dominant limb: 79.0±25.3 vs. 57.1±25.3Nm; non-dominant limb: 73.3±20.7 vs. 57.0±24.2N m). Moreover, the PTE, soccer participation and maturity status were positively associated with the BMD at all body sites (r2=0.57–0.73, P<0.05).
Conclusions |
Muscle strength of knee extensors is associated with BMD and BMC at all body sites. Muscle-skeletal structures respond positively to the weight-bearing and impact-loading imposed by soccer practice. Soccer seemed to be a multilateral balanced sport activity.
Le texte complet de cet article est disponible en PDF.Keywords : Bone mineral density, Isokinetic strength, Soccer practice, Adolescence
Plan
Vol 79 - N° 4
P. 403-408 - juillet 2012 Retour au numéro
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