Document Type : Research Paper I Open Access I Released under CC BY 4.0 license



This study aimed at comparing the acute effects of voluntary contractions (PAP) at different intensities and times on explosive power, sprint ​​and agility in football players. 13 subjects (mean age 17.7±0.63 years, weight 57.9±6.9 kg and height 167.9±5.4 cm) were selected as available sample. During 7 sessions, the protocols of warm-up without load, half-squat %45, %65, %85 1RM after 4 minutes and half-squat %45, %65, %85 1RM after 15 minutes were randomly administered for the variables of explosive power, sprint and agility, and 35-m sprint running, Sargent vertical jump and Illinois agility tests were performed. Data were analyzed using analysis of variance with repeated measures (ANOVA). The results showed no significant differences in explosive power with different intensities after 4 minutes in the PAP acute effect with P≤0.05 but there was a significant difference in explosive power with 65% and 85% intensities after 15 minutes compared with warm-up protocol. There was a significant difference in the sprint in PAP after 4 minutes of 65% and after 15 minutes of 65% and 85% intensities compared with warm-up protocol. There was a significant difference in the agility in PAP after 4 minutes of 65% and 85% and after 15 minutes of 65% intensity among the intensities. Generally, time has a more effective role in improving power and sprint activities of athletes at moderate and peak intensity and agility with moderate intensity in post-activation potentiation (voluntary contractions) acute effect especially after 15 minutes. 


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