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The Effect of Creatine Monohydrate Ingestion on Anaerobic Power Indices, Muscular Strength and Body Composition
Abstract #10 of 18
AUTHOR:
C. P. EARNEST,1 P. G. Snell,2 R. Rodriquez, A. L. Almada and T. L. Mitchell3 - 1Texas Woman's University, Dept. of Kinesiology, Denton, 2The University of Texas Southwestern Medical Center and 3The Cooper Clinic, Dallas, Texas; College of Physical Education and Sports, Stockhom, Sweden;

PUBLISHED:
ACTA Physiol Scand 1995, 153, 207-209

To the author's knowledge, Cr.H2O supplementation in strength trained athletes has not yet been reported in the literature.  Therefore, this study investigated the influence of Cr.H2O supplementation on muscular power and strength indices in 10 experienced weight-trained male subjects.  Three series of high intensity, anaerobic type, muscular workbouts were used.  Series one included three consecutive 30 second Wingate bike tests, interspersed with 5 minutes of rest.  Peak anaerobic power was denoted as the greatest power achieved in a given 5 second work interval.  Anaerobic work was defined as the total amount of work performed in a 30 second period.  Series two utilized a one repetition maximum (1 RM) free weight bench press as a test of muscular strength.  Series three employed complete lifting repetitions at 70% of the bench press 1 RM until fatigue.  Lifting cadence was paced through the use of a metronome set at a 1 second  timing interval (1 second eccentric, 1 second concentric) and fatigue was defined as (1) the inability to complete one lifting repetition or (2) the inability to maintain the lifting cadence.  Total lifting volume was calculate as 70% of pre-test 1 RM multiplid by the number of complete lifting repetitions.  Body composition was measured via hydrostatic weighing techniques.  Subjects received, in a double-blind fashion, either a glucose placebo or Cr.H2O supplement.  After 14 days of supplementation, each subject was retested on the Wingate bike tests.  Re-testing for the weight lifting and anthropometric parameters took place after 28 days of supplementation.  Eight subjects completed the experimental protocol.  Within the Cr.H2O group (4 subjects) total anaerobic work for the Wingate tests was significantly higher during all post-test trials (P<0.05).  These increases were 13% for the Wingate test 1, 18% for Wingate test 2, and 18% for Wingate test 3.  No changes were noted for the placebo group (4 subjects).  Greater total anaerobic work resulted from the Cr.H2O subject's ability to achieve and maintain higher levels of anaerobic power consistently over each 5 second time interval, with statistical significance being apparent for several 5 second power intervals during the three trials.  Bench Press 1 RM increased 6% in the Cr.H2O group (P<0.05).  When corrected for body weight no differences were noted because of a significant increase in body weight within the Cr.H2O group.  Total lifting volume was significantly higher within the Cr.H2O group, whether expressed in absolute terms (26%, P<0.01) or relative terms (29%, P<0.001).  Increases in total lifting volume were associated with the ability of the Cr.H2O group to perform 26% more lifting repetitions (P<0.01).  Body composition data indicated a significant increase in body weight as well as a non-significant increase in calculated fat-free mass for the Cr.H2O group.  No changes in body weight were noted for the placebo group.

 


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