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Date Permissions Signed
1-17-2016
Date of Award
Fall 2015
Document Type
Masters Thesis
Degree Name
Master of Science (MS)
Department
Health and Human Development
First Advisor
Suprak, David N. (David Nathan)
Second Advisor
Brilla, Lorraine R., 1955-
Third Advisor
Chalmers, Gordon R.
Abstract
The purpose of the study was to determine if an isometric quarter squat was sufficient to elicit postactivation potentiation (PAP) in a countermovement jump (CMJ) for recreationally trained individuals (n = 22). The isometric quarter squat conditioning stimulus consisted of three sets of six second maximal voluntary contractions against a custom made apparatus. The conditioning stimulus was designed to acutely enhance CMJ performance by stimulating PAP, in turn improving indicators of CMJ performance which included eccentric rate of force development (ERFD), mean rate of force development (MRFD), peak rate of force development (PRFD), reactive strength index (RSI), and peak power (PP). CMJ performance was tested at one, five, ten, and fifteen minutes post-conditioning stimulus to identify the optimal recovery time for optimal performance. Statistical analysis was carried out using a two-way repeated measures analysis of variance (ANOVA) and no significant or meaningful change was found in ERFD, MRFD, PRFD, RSI, or PP. The overall power was small for all variables suggesting that the ability of the current study to observe an effect that might have existed was very unlikely. Effect size was also small in all variables suggesting that the change pre to post-testing was not meaningful. Some critical factors that may have contributed to the results included the individual’s ability to potentiate, body positioning during conditioning stimulus, and level of conditioning of subjects.
Type
Text
DOI
https://doi.org/10.25710/zqwq-tf62
Publisher
Western Washington University
OCLC Number
940506828
Subject – LCSH
Isometric exercise--Physiological aspects; Jumping--Physiological aspects
Format
application/pdf
Genre/Form
masters theses
Language
English
Rights
Copying of this document in whole or in part is allowable only for scholarly purposes. It is understood, however, that any copying or publication of this thesis for commercial purposes, or for financial gain, shall not be allowed without the author's written permission.
Recommended Citation
Dropp, Mitchell W., "The Effects of an Isometric Quarter Squat on Countermovement Jump Performance" (2015). WWU Graduate School Collection. 460.
https://cedar.wwu.edu/wwuet/460