| The effects of creatine loading and gender on anaerobic running capacity. | |
| | |
MedLine Citation:
|
PMID: 20543729 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
Creatine (Cr) loading consists of short-term, high-dosage Cr supplementation and has been shown to increase intramuscular total Cr content. Increases in body weight (BW) have been shown to result from Cr loading, with differences by gender, and increased BW may impact weight-bearing exercise. The critical velocity (CV) test is used to quantify the relationship between total running distance and time to exhaustion. The CV test provides the variable, anaerobic running capacity (ARC), which is an estimate of the anaerobic energy reserves in muscle. The purpose of this study was to examine the effects of gender and Cr loading on ARC. Fifty moderately trained men and women volunteered to participate in this randomized, double-blinded, placebo (PL)-controlled, repeated-measures study. After a familiarization session, a 3-day testing procedure was conducted. A maximal oxygen consumption test VO(2)max) on a treadmill was performed on day 1 to establish the maximum velocity (Vmax) at VO(2)max and to record BW. Days 2 and 3 involved treadmill running at varying percentages of Vmax. Participants were randomly assigned to either the Cr or PL group and received 20 packets of the Cr supplement (1 packet = 5 g Cr citrate, 18 g dextrose) or 20 packets of the PL (1 packet = 18 g dextrose). After consuming 4 packets daily for 5 consecutive days, the 3-day testing procedure was repeated. The male Cr loading group exhibited a 23% higher (p = 0.003) ARC compared to the PL group. Nonsignificant BW increases were found for the Cr groups. These findings suggest that Cr loading may be an effective strategy for improving ARC in men, but not in women, and revealed only nonsignificant increases in BW. Creatine loading may be used before competition by athletes to provide improvements in high-intensity, short-duration activities. |
| | |
Authors:
|
David H Fukuda; Abbie E Smith; Kristina L Kendall; Teddi R Dwyer; Chad M Kerksick; Travis W Beck; Joel T Cramer; Jeffrey R Stout |
Related Documents
:
|
3620799 - Sports-specific fitness testing in squash. 14625449 - Exercise activates the endocannabinoid system. 9049739 - Effect of running intensity on intestinal permeability. 270939 - Marathon running and immunity to atherosclerosis. 1752709 - Training-overtraining. a prospective, experimental study with experienced middle- and l... 7649709 - Run training vs cross training: influence of increased training on running economy, foo... 18644399 - Fitness alters fluid regulatory but not behavioural responses to hypohydrated exercise. 12692139 - A feedback-controlled treadmill (treadmill-on-demand) and the spontaneous speed of walk... 1721179 - A new algorithm for minimizing pacemaker polarization artifact: universally applicable ... |
Publication Detail:
|
Type: Journal Article; Randomized Controlled Trial |
Journal Detail:
|
Title: Journal of strength and conditioning research / National Strength & Conditioning Association Volume: 24 ISSN: 1533-4287 ISO Abbreviation: J Strength Cond Res Publication Date: 2010 Jul |
Date Detail:
|
Created Date: 2010-07-05 Completed Date: 2010-10-25 Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 9415084 Medline TA: J Strength Cond Res Country: United States |
Other Details:
|
Languages: eng Pagination: 1826-33 Citation Subset: IM |
Affiliation:
|
Metabolic and Body Composition Laboratory, Department of Health and Exercise Science, University of Oklahoma, Norman, Oklahoma, USA. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Adult Athletes Creatine / administration & dosage* Dietary Supplements* Female Humans Male Muscle, Skeletal / drug effects*, physiology Oxygen Consumption / drug effects, physiology Running / physiology* Sex Factors Young Adult |
| Chemical | |
Reg. No./Substance:
|
57-00-1/Creatine |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Short-duration massage at the hamstrings musculotendinous junction induces greater range of motion.
Next Document: Relationship Between Body Composition, Leg Strength, Anaerobic Power, and On-Ice Skating Performance...