Author(s): Dr. Devender Prakash and Manju Dalal

Abstract:
The purpose of this study was to determine the effects of circuit type resistance training on body composition and bone status in young males. Twenty eight moderately active male volunteers were randomly assigned to 12 weeks of circuit resistance training (CRT) (n=15; 24.3±1.4 years) or control (C) (n=13; 24.8±2.1 years). Total body fat (%BF), fat mass (FM), fat-free mass (FFM), bone mineral content, and bone mineral density (BMD) measurements were performed with dual-energy X-ray absorptiometry. At the end of the 12-week training period, there was a decrease (p<.05) in the CRT group % BF (-1.63%), FM (-1.03kg), an increase in FFM (1.46kg), and no change (p>.05) in body weight or BMD. In C, no significant (p>.05) changes were observed. CRT bone mineral density values were significantly (p<.05) higher (.003g/cm) after the 12 week training period versus the control group values (-.005g/cm). Results suggest that 12 weeks of circuit resistance training in moderately active young males had a positive effect on body composition and bone status, with no effect on body weight. Additional studies may identify effects of circuit resistance training on body composition and bone mineral density in women and aging.

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