An investigation into the prolonged affects post-activation potential over a twenty-four hour period.
Cardiff Metropolitan University
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The current study intended to observe the post-activation potential (PAP) response outside of the traditionally view <20minute timeframe. A secondary area of investigation was comparing how much the upper and lower body differed in PAP response. Resistance trained athletes from numerous sports undertook the study (n=11; age: 20.5±0.71, height: 178.45±4.62, weight: 79.40±11.15). Each participant set baseline scores on ballistic movements of bench throw and jump squat, with peak power output (PPO) average power output (APO) peak velocity (PV) and average velocity (AV) all being recorded, a Tendo Accelerometer produced the data. In later sessions participants underwent a contractile stimulus (CS) of a 3-rep max bench and squat followed by a set rest period (5 minutes, 1 hour, 6 hours and 24 hours) and then testing of ballistic moves. An ANOVA and was completed on the data comparing all of the values against the baseline scores and significant differences (P < .05) were observed at 6 hours lower body PV, AV and APO along with a highly significant (P < .01) data point at 5 minutes lower body AV. No significant points were observed in the upper body. When comparing the upper and lower body a paired sample t-test revealed significant differences between at 5 minutes AV. Finally the max scores produced for each variable and the baseline scores underwent a paired sample t-test purely to highlight PAP had occurred. Lower PPO, upper PPO and APO were significant and all other variables were highly significant. All significant data produced had a least squares post hoc test completed on it. It was observed from the results that at 6 hours post CS the scores produced were noticeably higher than that of the baseline or any other score. This was postulated to be attributed to the theory of circadian rhythm and not to the traditional PAP mechanisms. It was noticed that there was a slight difference between the upper and lower body but this had been related to possible different training history of participants. This aided in concluding that a group response 6 hours post CS is the optimal timeframe however PAP is extremely individualised therefore a coach should test their athlete’s response prior to using this theory for competition.
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