Document Type



This study examined the effect of a harness resisting leg movement on sprinting and jumping performance. Split times for 10, 20, 36.58 and 50 meters, kinematics of hip and knee angles during sprinting, forces of maximum countermovement jumps and dualenergy X-ray absorptiometry (DEXA) were measured prior and following five-weeks of training with the resistance device. Results showed significant improvement in 10 m sprint times and knee extension during sprinting following five-weeks training (p<.05). No significant changes in jump or DEXA parameters were seen. Findings of the current study indicate that the SpeedMaker device may improve the acceleration phase of sprinting and stimulate a larger range of motion at the knee joint. Future studies with the device should include longer training periods, greater sample sizes and a measurement of resistance.