The Effect Of Different Conditioning Contraction Loading on Post-Activation Potentiation.
Cardiff Metropolitan University
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A muscle’s ability to generate force and velocity is determined by several components which are a consequence of its contractile history; however, this has been shown to be acutely yet significantly influenced following an exercise activity. A positive influence will lead the muscle to a potentiated state called Post-activation Potentiation (PAP) where the ability of the muscle to generate power is enhanced for a period of time. Although the use of a heavy resistance pre-contraction is well documented to elicit a potentiated state, little research has been completed on optimal or submaximal loading used as a medium to attain PAP in an individual. The purpose of the present study was to determine whether a light load contraction would produce a more potentiated state, cause a decrease in subsequent power performance, or provide the same effect as heavy loaded contractions on an athlete’s counter movement jump (CMJ) performance over two trials. Eight male subjects, aged 19-22, from different sporting backgrounds and one repetition maximum (1RM) squat strength (mean ± standard deviation: 131Kg ± 28Kg 1) completed in a blocked randomized order a squat intervention set (SIS) on the first trial, either; three repetitions at 90% 1RM or six repetitions at 65% 1RM. The second trial day consisted of the opposite SIS to the first trial day and both trial days included a baseline CMJ measurement as well as a CMJ measurement following eight minutes rest after the SIS where peak power (PP), peak velocity (PV), average power (AP) and average velocity (AV) were recorded. No significant differences were found with any of the variables measured between the baseline and post-contraction CMJ for either SIS. However, a trend was observed with both interventions; where the light SIS generally showed a slight decrease in performance, whereas the heavy SIS displayed a general increase in performance.
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