Citation

Seabra AF, Marques EA, Brito J, Krustrup P, Abreu S, Oliveira J, Rêgo C, Mota J, Rebelo A. Joint Bone Spine 2012; 79(4): 403-408.

Affiliation

Faculty of Sport, University of Porto, Centre of Research, Education, Innovation and Intervention in Sport, Porto, Portugal.

Copyright

(Copyright © 2012, Elsevier Publishing)

DOI

10.1016/j.jbspin.2011.09.003

PMID

22071408

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/cm(2), P=0.003) and dominant (1.09±0.01 vs. 1.02±0.01g/cm(2), P<0.001) and non-dominant (1.09±0.01 vs. 1.01±0.01g/cm(2), 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 (r(2)=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.

Language: en