Effect of Calcium Intake, Tennis Playing, and Body Composition on Bone-Mineral Density of Brazilian Male Adolescents

Effect of Calcium Intake, Tennis Playing, and Body Composition on Bone-Mineral Density of Brazilian Male Adolescents

Author Juzwiak, Claudia Ridel Autor UNIFESP Google Scholar
Amancio, Olga Maria Silverio Autor UNIFESP Google Scholar
Vitalle, Maria Sylvia de Souza Autor UNIFESP Google Scholar
Szejnfeld, Vera Lucia Autor UNIFESP Google Scholar
Pinheiro, Marcelo de Medeiros Autor UNIFESP Google Scholar
Institution Universidade Federal de São Paulo (UNIFESP)
Abstract In this prospective, cross-sectional study male adolescent tennis players (44) and nonathletic controls (32) were evaluated to determine the effects of physical activity. dietary nutrient intakes. sexual maturation, and body composition oil bone-mineral density (BMD). Dietary nutrient intakes and physical activity expenditure were estimated by 4-d diaries. Total body composition. bone-mineral content (BMC), and BMD (L1-L4, femur, and nondominant forearm) were assessed by dual-energy X-ray absorptiometry. Tennis players had significantly greater lean body mass (mean [SEM] 50.6 [1.6] kg vs. 45.1 [1.7] kg, p = .022). trochanter BMD (1.0 [0.02] 1 g/cm(2) vs. 0.9 [0.03] g/cm(2), p = .032), and dominant forearm BMC (173.7 [7.4] vs. 146.5 [9.3] g) but lower BMD in the nondominant forearm (0.7 [0.02] g/cm(2) vs. 0.8 [0.03] g/cm(2), p = .028). Daily average calcium intake was below the recommendation in both groups. No correlation was found between BMD and calcium intake and exercise. Lean body mass was the best predictor of BMD and BMC for both tennis players and controls (R-2 = .825,.628, and .693 for L1-L4. total femur, and nondominant forearm. respectively). Based oil these results the authors conclude that lean body, mass is the best Predictor of BMD and BMC for both tennis players and others. Tennis exerts it site-specific effect, and training should focus Oil ways minimize this effect. Although calcium intake showed no effect on BMD, nutrition education for young athletes should focus on promoting a balanced diet, providing energy and nutrients in adequate amounts.
Keywords adolescence
lean body mass
exercise
dietary intake
Language English
Date 2008-10-01
Published in International Journal Of Sport Nutrition And Exercise Metabolism. Champaign: Human Kinetics Publ Inc, v. 18, n. 5, p. 524-538, 2008.
ISSN 1526-484X (Sherpa/Romeo, impact factor)
Publisher Human Kinetics Publ Inc
Extent 524-538
Origin https://doi.org/10.1123/ijsnem.18.5.524
Access rights Closed access
Type Article
Web of Science ID WOS:000260712900008
URI http://repositorio.unifesp.br/11600/44107

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