(1) Introduction: The purpose of this study was to determine the acute effects of hipdominant eccentric post-activation potentiation (PAP) on broad jump distance, through the usage of dynamic (concentric) tempo and eccentric tempo conventional straight bar switch grip deadlifts. This study hypothesized that the experimental eccentric tempo deadlift protocol would result in greater improvements to broad jump performance than the experimental dynamic or control protocols. (2) Methods: Twenty-four varsity football players from Tufts University aged 18-22 years were recruited. Participants were assigned into three groups and cycled through one control protocol and two experimental protocols, over the course of three testing sessions within a three-week period. Informed consent was obtained from the participants and coaching staff. The control protocol consisted of a standardized dynamic warm-up, an active rest period, and a broad jump testing protocol. The experimental protocols consisted of a standardized dynamic warm-up, a dynamic or eccentric tempo deadlift protocol, an active rest period, and a broad jump testing protocol. (3) Results: The control protocol resulted in a maximum broad jump mean of 102.12 ± 7.53 inches. The experimental dynamic protocol resulted in a maximum broad jump mean of 101.77 ± 6.55 inches. The experimental eccentric protocol resulted in a maximum broad jump mean of 102.58 ± 6.93 inches. A one-way (single factor) ANOVA test indicated no significant differences between any of the means, with p=0.92, and F crit > F (where F crit=3.12 and F=0.08), where a p-value of 0.05 was used to determine the significance of the results. (4) Discussion: The results concluded that neither experimental tempo deadlift protocol had a significant effect on broad jump performance. (5) Conclusion: While the results of this study and the previous literature reviewed found only mixed and inconclusive results concerning which specific skeletal muscle contraction is the most beneficial for triggering the physiological 3 mechanisms of PAP and improving power performance, there still remains a significant body of evidence supporting the effectiveness of PAP for enhancing power performance. Further research on the subject is strongly recommended
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