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

Camic, Clayton L.1; Housh, Terry J.2; Zuniga, Jorge M.3; Traylor, Daniel A.2; Bergstrom, Haley C.2; Schmidt, Richard J.2; Johnson, Glen O.2; Housh, Dona J.4

Journal of Strength & Conditioning Research:
doi: 10.1519/JSC.0b013e3182a361a5
Original Research
Abstract

Abstract: Camic, CL, Housh, TJ, Zuniga, JM, Traylor, DA, Bergstrom, HC, Schmidt, RJ, Johnson, GO, and Housh, DJ. The effects of polyethylene glycosylated creatine supplementation on anaerobic performance measures and body composition. J Strength Cond Res 28(3): 825–833, 2014—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 ± 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.

Author Information

1Department of Exercise and Sport Science, Human Performance Laboratory, University of Wisconsin-La Crosse, La Crosse, Wisconsin;

2Department of Nutrition and Health Sciences, University of Nebraska-Lincoln, Lincoln, Nebraska;

3Department of Exercise Science, Creighton University, Omaha, Nebraska; and

4Department of Oral Biology, University of Nebraska Medical Center, Lincoln, Nebraska

Address correspondence to Clayton L. Camic, ccamic@uwlax.edu.

Copyright © 2014 by the National Strength & Conditioning Association.