Document Type
Article
Publication Date
2008
Abstract
This study examined the efficacy of two different resistance training programs in enhancing bone modeling and bone mineral density (BMD) in maturating rats. One exercise mode involved lifting a lighter weight with more repetitions (LI), while the other regimen involved lifting a heavier weight with fewer repetitions (HI) where the total volume of work between exercise programs was equivalent by design. Twenty-three male rats were randomly divided into control (Con, n = 8), LI (n = 7), and HI (n = 8) groups. The LI and HI groups were conditioned to climb a vertical ladder with weights appended to their tail 4 days/wk for 6 wks. After training, serum osteocalcin (OC) was significantly (p < 0.05) higher in both HI (45.2 +/- 1.7 ng/ml) and Ll (39.1 +/- 2.2 ng/ml) when compared to Con (29.9 +/- 0.9 ng/ml). Left tibial BMD was significantly (p < 0.05) greater for HI (0.231 +/- 0.004 g/cm(2)) when compared to both LI (0.213 +/- 0.003 g/cm(2)) and Con (0.206 +/- 0.005 g/cm(2)) with no significant difference between Ll and Con. The results indicate that both HI and LI are effective in elevating serum OC, implicating an osteogenic response; however, only HI resulted in a significant elevation in BMD.
Recommended Citation
Smith, M. Z., B. M. Goettsch, R. D. Van Ramshorst, J. A. O'brien, S. V. Jaque, and K. D. Sumida. "Resistance training and bone mineral density during growth." International journal of sports medicine 29.04 (2008): 316-321. doi: 10.1055/s-2007-965461
Copyright
Georg Thieme Verlag KG
Included in
Animals Commons, Animal Sciences Commons, Animal Structures Commons, Exercise Science Commons, Musculoskeletal System Commons, Sports Sciences Commons
Comments
This article was originally published in International Journal of Sports Medicine, volume 29, issue 4, in 2008. DOI: 10.1055/s-2007-965461