The Effects of Polyethylene Glycosylated Creatine Supplementation on Anaerobic Performance Measures and Body Composition

Authors

Clayton L. Camic, University of Wisconsin-La CrosseFollow
Terry J. Housh, University of Nebraska-LincolnFollow
Jorge M Zuniga, Creighton UniversityFollow
Daniel A. Traylor, University of Nebraska-Lincoln
Haley Bergstrom, University of Nebraska-LincolnFollow
Richard J. Schmidt, University of Nebraska-LincolnFollow
Glen O. Johnson, University of Nebraska-LincolnFollow
Dona J. Housh, University of Nebraska Medical CenterFollow

Date of this Version

2014

Citation

Published in Journal of Strength and Conditioning Research 28:3 2014, pp. 825-833.

Comments

Copyright © 2014 National Strength and Conditioning Association; published by NSCA. Used by permission.

Abstract

The purpose of this study was to examine the effects of 28 days of polyethylene glycosylated creatine (PEG-creatine) supplementation (1.25 and 2.50 g · d^-1) on anaerobic performance measures (vertical and broad jumps, 40-yard dash, 20-yard shuttle run, and 3-cone drill), upper- and lower-body muscular strength and endurance (bench press and leg extension), and body composition. This study used a randomized, double-blind, placebo controlled parallel design. Seventy-seven adult men (mean age ± SD, 22.1 6 2.5 years; body mass, 81.7 ± 10.8 kg) volunteered to participate and were randomly assigned to a placebo (n = 23), 1.25 g · d^-1 of PEG-creatine (n = 27), or 2.50 g · d^-1 of PEG-creatine (n = 27) group. The subjects performed anaerobic performance measures, muscular strength (one-repetition maximum [1RM]), and endurance (80% 1RM) tests for bench press and leg extension, and underwater weighing for the determination of body composition at day 0 (baseline), day 14, and day 28. The results indicated that there were improvements (p , 0.0167) in vertical jump, 20-yard shuttle run, 3-cone drill, muscular endurance for bench press, and body mass for at least one of the PEG-creatine groups without changes for the placebo group. Thus, the present results demonstrated that PEG-creatine supplementation at 1.25 or 2.50 g · d^-1 had an ergogenic effect on lower-body vertical power, agility, change-of-direction ability, upper-body muscular endurance, and body mass.