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Date Permissions Signed

7-2017

Date of Award

Summer 2017

Document Type

Masters Thesis

Degree Name

Master of Science (MS)

Department

Health and Human Development

First Advisor

Brilla, Lorraine R., 1955-

Second Advisor

Suprak, David N. (David Nathan)

Third Advisor

San Juan, Jun G.

Abstract

Creatine supplementation is an ergogenic aid that is often used to enhance resistance training. Electrolytes can help to increase the absorption of creatine. This study examined effects of two differently formulated creatine supplements, creatine monohydrate (CM) or creatine-magnesium chelate (CE), compared to placebo on fatigue, work, and power during knee extensions. Subjects (n=23; 21.9±1.8 years) maintained their regular resistance training program and had not supplemented with creatine in the previous 6 months. Supplementation was 4 g creatine daily for CM and CE, plus 400 mg magnesium in CE. Maximum torque and fatigue of knee extensions at 180 ° sec-1 were determined using an isokinetic dynamometer for 2 sets of 30 repetitions each, with 2 minutes rest between sets. Fatigue was calculated by the ratio between the first 1/3 and the last 1/3 of work for each set. Body composition was determined via a three-site skin-folds using standard calipers. Statistical analyses were performed using mixed ANOVA. Fatigue results demonstrated no significant differences (p > 0.05). For work and average power, there were no significant interaction effects (p > 0.05) in either set 1 or 2. There was a significant time effect for work (1987.49±617.65 J, CM: 1978.55±723.21 J, CE: 2485.57±677.58 J; p = 0.001; ηp2=0.371) and average power (165.4±70.33 W, CM: 160.59±56.28 W, CE: 186±66.71 W; p = 0.003; ηp2=0.407) in set 1; with no significant differences in set 2 (p > 0.05). There were no significant effects of time or group for body composition (p > 0.05). There were no significant differences in these variables for the second set in any group. Supplementation with a creatine-electrolyte formula may help increase total work and average power in resistance-trained individuals.

Type

Text

Publisher

Western Washington University

OCLC Number

998843731

Digital Format

application/pdf

Genre/Form

Academic theses

Language

English

Rights

Copying of this thesis 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.

Included in

Kinesiology Commons

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