Document Detail

Influence of Knowledge of Sprint Number on Pacing during Repeated-Sprint Exercise.
MedLine Citation:
PMID:  20798658     Owner:  NLM     Status:  In-Data-Review    
PURPOSE: : The anticipation of exercise-induced stress influences performance during continuous exercise. However, not all exercise is continuous. This study explores the influence of prior knowledge of sprint number on mechanical work, surface EMG, and RPE during repeated-sprint exercise (RSE).
METHODS: : Fourteen athletes performed three RSE in random order. In one trial, subjects were informed that they would perform ten 6-s cycle sprints (with 24 s of rest) and then completed 10 sprints (control trial, CL). In a second trial, subjects were told to perform five sprints, but after the fifth sprint, they were asked to perform an additional five sprints (deception trial, DC). In a third trial, subjects were not told how many sprints they would be performing but were stopped after 10 sprints (unknown trial, UN). Data were recorded for every sprint.
RESULTS: : Both the initial sprint work and work accumulated during the first five sprints were greater (6.5%, P < 0.05) in the DC than in the CL and UN trials. Furthermore, the work accumulated during the ten sprints was lower (4.0%, P < 0.05) in the UN trial than in the two other trials. The EMG was greater (P < 0.05) in the DC than in the CL and UN trials during the initial sprint (8.8%) and during the first five sprints (9.1%). The sprint-induced decrease in EMG and work occurred earlier in the UN trial compared with the CL and DC trials. The RPE profile was similar in all trials.
CONCLUSIONS: : Results demonstrate that pacing occurs during short repeated-sprint efforts in anticipation of the number of sprints that are included in the trial.
François Billaut; David J Bishop; Simon Schaerz; Timothy D Noakes
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  43     ISSN:  1530-0315     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  2011 Apr 
Date Detail:
Created Date:  2011-03-17     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  665-72     Citation Subset:  IM; S    
1School of Sport and Exercise Science, Victoria University, Melbourne, AUSTRALIA; 2Institute of Sport, Exercise and Active Living, Victoria University, Melbourne, AUSTRALIA; 3Integrative Physiology Unit, University of Lethbridge, Alberta, CANADA; and 4MRC Research Unit for Exercise Science and Sports Medicine, University of Cape Town, SOUTH AFRICA.
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