Year of Publication

2015

Date of Thesis

12-2015

Document Type

Thesis

Degree Name

Master of Science

Department

Exercise and Sport Sciences

Abstract

PURPOSE: Data show that heavy preload stimuli preceding a sprint can improve performance by eliciting postactivation potentiation (PAP), an increased intramuscular sensitivity to calcium that enhances cross-bridge cycling, thereby acutely enhancing force production and strength. The aim of this study was to compare depth jumps (DJ) to back squats (BS) as a means to elicit PAP in college aged female rowers. METHODS: Twenty Division III collegiate female athletes, whose mean ± SD for age, height, weight, and VO2 Max were, respectively, 18.9 ± 0.9y, 1.5 ± 0.05m, 60.7 ± 21.4kg and 42.8 ± 4.44 ml.kg-1.min-1, completed a 40m sprint timed at 10m, 20m, and 40m with an electronic timing system. Subjects were randomly divided into either the DJ or BS group. Subsequently, their one repetition maximum (1 RM) for the BS or DJ was measured. One week later, subjects completed a 40m sprint, and then three repetitions at 90% of their 1RM for BS or three DJ; after 7 min of active rest, they completed a second 40m sprint. A dynamic warm-up and active cool down preceded and followed each testing session. Data were analyzed with three 2x2 repeated measures ANOVA with post hoc t-test performed where significance was found. RESULTS: Both conditions increased sprint time at 40m with DJ being significantly slower while BS only trended toward significance; DJ and BS 20m sprint time was also slower although not significantly. CONCLUSION: The data show that three repetitions at 90% of 1RM for BS or three DJ did not elicit PAP in female college rowers. These findings may be related to sex, load, training incompatibility, or sprinting proficiency in this subject population.

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