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DOI: 10.1055/s-0030-1268503
© Georg Thieme Verlag KG Stuttgart · New York
Effect of High-Impact Aerobics and Strength Training on BMD in Young Women Aged 20–35 Years
Publikationsverlauf
accepted after revision October 12, 2010
Publikationsdatum:
16. Dezember 2010 (online)
![](https://www.thieme-connect.de/media/sportsmed/201102/lookinside/thumbnails/10.1055-s-0030-1268503-1.jpg)
Abstract
To evaluate the effects of a 12-month exercise intervention using either high-impact step aerobic exercise or moderate-intensity strength training on areal bone mineral density (aBMD) we studied 51 untrained women, aged 20–35 years, for this study. Whole body and heel and wrist aBMD were measured by dual-energy X-ray absorptiometry (DXA, Hologic or PIXI Lunar). Subjects were randomly assigned to: impact-loaded step aerobic exercise (SA, n=15), moderate-intensity lower body strength training (ST, n=16) or non-exercise control (CON, n=20). Data analysis only included those who completed 95% of each training routine and attended at least 80% of all sessions. Group differences in aBMD, leg press strength and urinary cross-link deoxypridinoline (μDPD) were analysed using analysis of variance. After a 12-month intervention, the SA elicited an increase in aBMD of the heel (4.4%, p<0.05) and leg press strength (15%, p<0.05), relative to baseline. Meanwhile, the ST showed an increase in leg press strength (48%, p<0.05) with no significant increase in aBMD at any measured site. Similar and unchanged μDPD was observed in all 3 groups at baseline, 6 and 12 months. In conclusion, a 12-month high-impact step aerobic exercise resulted in a significant increase in the heel aBMD in untrained young women, who complied with the exercise regimen. A moderate intensity strength training intervention of similar duration had no effect on aBMD although leg strength increased significantly.
Key words
heel and wrist BMD - leg press strength - femoral neck BMD - cross-link deoxypridinoline - young women - untrained
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Correspondence
Dr. Michael T. C. Liang
California State Polytechnic
University Pomona
Kinesiology and Health
Promotion
3801 W. Temple Avenue
91768 Pomona
United States
Telefon: +1/909/869 2770
Fax: +1/909/869 4749
eMail: mtcliang@csupomona.edu