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Int J Sports Med 2015; 36(12): 992-998
DOI: 10.1055/s-0035-1555777
Training & Testing
© Georg Thieme Verlag KG Stuttgart · New York

Training-induced Increase in Bone Mineral Density between Growing Male and Female Rats

W. Joo
1   Crean School of Health, Department of Kinesiology, California State University, Northridge, Northridge, United States
,
H. Singh
1   Crean School of Health, Department of Kinesiology, California State University, Northridge, Northridge, United States
,
C. P. Ahles
1   Crean School of Health, Department of Kinesiology, California State University, Northridge, Northridge, United States
,
Y. Lee
1   Crean School of Health, Department of Kinesiology, California State University, Northridge, Northridge, United States
,
W. Colazas
1   Crean School of Health, Department of Kinesiology, California State University, Northridge, Northridge, United States
,
L. C. Lee
1   Crean School of Health, Department of Kinesiology, California State University, Northridge, Northridge, United States
,
A. Prakash
1   Crean School of Health, Department of Kinesiology, California State University, Northridge, Northridge, United States
,
S. V. Jaque
1   Crean School of Health, Department of Kinesiology, California State University, Northridge, Northridge, United States
,
K. D. Sumida
1   Crean School of Health, Department of Kinesiology, California State University, Northridge, Northridge, United States
› Author Affiliations
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Publication History



accepted after revision 20 May 2015

Publication Date:
24 July 2015 (online)

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Abstract

The purpose of this study was to determine the existence of sex differences in the resistance training-induced elevation in bone mineral density (BMD) and bone strength (Fmax) during the growth period in rats. 16 male (M) and 16 female (F) rats (approx. 8 weeks old) were randomly divided into sedentary control (MC=8, FC=8), and resistance-trained (RT) groups (M-RT=8, F-RT=8). The RT groups were conditioned to climb a vertical ladder 4 consecutive times (per exercise session) with weights attached to their tail 3 days per week for a total of 6 weeks. After 6 weeks, there were no interaction effects (sex×exercise). The main effect of sex indicated no difference in tibial BMD (in g/cm2) for males (0.226±0.005) compared to females (0.221±0.004). However, Fmax (in Newtons) was significantly greater for males (131.3±5.3) compared to females (89.9±3.0). The main effect of exercise indicated that tibial BMD and Fmax were significantly greater for RT groups (0.234±0.004 g/cm2 and 120.9±7.4 Newtons) compared to controls (0.212±0.003 g/cm2 and 100.3±5.1 Newtons). The results indicate that during growth, there were no sex differences in the training-induced elevation in BMD and bone mechanical properties.

Key words

tibia - DXA - bone strength - 3-point bending test
 

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