Effects of GravitronRTM training on upper body strength in 11--13 year old students

This study examined the effects of using one or three sets of assisted pull-ups on the GravitronRTM 2000 AT unit by StairMaster RTM to increase upper body strength in adolescents. Fifty-four students participated in the study consisting of three upper body strength tests: pull-ups, flexed-arm hang, and push-ups. Forty-two subjects engaged in a 12-week training protocol on the GravitronRTM performing either one set (T1, N = 21), or 3 sets (T3, N = 21). Statistical analysis supported a significant improvement in strength (p < 0.05) as assessed by the number of pull-ups completed for the T3 group. All other test results revealed nonsignificant changes. This type of training did not significantly increase the passing rate on the President's Council on Physical Fitness and Sports standards for strength or endurance. In conclusion, upper body strength was improved with 3 sets of assisted pull-up training after 12 weeks of training as shown by an increase in number of pull-ups performed.