OBJECTIVE: to test the effects of high dosage of caffeine on the bone breaking force of young female rats submitted to vertical jumping training. METHODS: young female rats were divided into 4 groups (2 x 2 factorial, Caffeine and Exercise). Caffeine groups ingested 3 doses of caffeine (10 mg/100 g bw) weekly. Exercise groups performed vertical jumps in water, 5 days/week, for 6 weeks. Urinary calcium, femur's diameter, mass and breaking force were assessed. RESULTS: caffeine and exercise increased the loss of calcium. Caffeine increased diameter and reduced femur mass, but did not affect its breaking force. Exercise increased bone's diameter and bone breaking force. CONCLUSION: caffeine does not impair bone breaking force in young female rats while vertical jumping enhances bone strength
Exercise; bone health
