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Tennis playing initiated before puberty leads to greater skeletal benefits in peri-pubertal boys than girls when training is maintained

conference contribution
posted on 2008-01-01, 00:00 authored by Gaele Ducher, J Black, Robin DalyRobin Daly, C Turner, Shona Bass
Introduction: The purpose of the study was to compare the exercise-induced changes in bone mass and geometry between boys and girls.

Methods: Eighty competitive tennis players (43 boys, 37 girls) aged 7–19 years participated. Pubertal status was self-assessed using Tanner stages (TS 1–5). The dominant and nondominant humeri were compared for DXA-derived bone mass (BMC) and MRI-derived bone geometry [total bone area (TA), medullary area (MA) and cortical bone area (CA)].

Results/Discussion: Exercise-induced side-to-side differences in BMC, TA and CA were significant from TS1 to 5 in boys and girls (p < 0.06). Pre-pubertal (TS1) girls and boys show similar side-to-side difference in BMC after adjustment for training volume (19% vs. 15%, ns). Similar findings were found forTA and CA. In contrast, during puberty (TS2-4) boys displayed greater side-to-side differences than girls for BMC (27% vs. 18%, p < 0.05), TA (13–15% vs. 8%, p < 0.05) and CA (32% vs. 20%, p < 0.01), even after adjustment for tennis history. Girls partly compensated for the lack of an exercise-induced increase in bone size by a reduction of the medullary cavity on the dominant side (−5.5 to −13%, p < 0.05). In post-puberty (TS 5 or postmenarche), the size of the medullary cavity remained smaller on the dominant side in girls (−5% to −9%, p = 0.1–0.05??) whereas no such reduction was observed in boys.

Conclusion: Regular exercise initiated before puberty and maintained throughout puberty leads to greater skeletal benefits in peri-pubertal boys than girls for bone mass and bone size, two of the major determinants of bone strength.

History

Event

ASICS conference of science and medicine in sport (2008 : Hamilton Is., Queensland)

Publisher

Elsevier

Location

Hamilton Island

Place of publication

Amsterdam, The Netherlands

Start date

2008-10-16

End date

2008-10-18

ISSN

1440-2440

Language

eng

Notes

Published in 'Journal of science and medicine in sport' Vol.12 Supplement 1, January 2009

Publication classification

E3 Extract of paper

Copyright notice

2008, Elsevier Ltd

Title of proceedings

ASICS conference of science and medicine in sport 2008 : abstracts

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