Introduction: Warm up with static stretching before exercise reduces the power performance and neuromuscular activity. The warm-up with voluntary contraction can increase the power performance through post activation potentiation (PAP). PAP causes acute increase of performance explosion through increasing the muscle fibers recruiment and motor nerve activity. Sale (2002) showed the PAP positive effect on through put performance. Because most of the previous research have studied the effects of static and dynamic warming up power performance in athletes and fewer compared these two methods with different intensities, therefore, the aim of this study was to determine the effects of static and dynamic specific voluntary contractions with different intensities on the performance of the vertical jump, horizontal jump, maximum strength and leg velocity. Methodology: 13 men of athlete students (with an average 22.69±1.75 years old and 70.61±3.76 kg weight) participated in this study. Subjects exposed to five different protocols intersecting and randomly. Protocols included warming up alone, warming and performing static half Scott with 60% and 90% of maximum intense, warming up and performing vertical jump with 5% and 10% of one maximum repetition by weight vest.
Results: The results by using repeated measure variance test showed that vertical jump after performing protocols of 5% and 10% with weight vest in comparison with warming protocols, increased significantly (P=0.003, P=0.041).
Discussion: Generally, warm up with dynamic contraction, particularly through PAP phenomenon is more effective than static warming up alone. In addition, this method of warming up can also increase the specific power-speed performance using characteristics (movement pattern) combined with intensity and suitable load.