Document Detail


Workload demands in mountain bike racing.
MedLine Citation:
PMID:  15162249     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
This study aims at describing the workload demands during mountain bike races using direct power measurements, and to compare these data to power output and physiological findings from laboratory exercise tests. Power output (P, Watt) from 11 national team cyclists (9 male, 2 female) was registered continuously during 15 races using mobile crank dynamometers (SRM System). To evaluate the intensity of racing, incremental exercise tests with determination of P at aerobic and anaerobic thresholds (AT, IAT) and at exhaustion (MAX) were performed. Intensity zones were determined (zone 1 < AT; AT < zone 2 < IAT; IAT < zone 3 < MAX; zone 4 > MAX) and time spent during racing in these zones was calculated. Based on power output measurements P during racing was 246 +/- 12 W (male) and 193 +/- 1 W (female). P showed high variation throughout the race. In contrast heart rate (HR) was relatively stable during racing (male 177 +/- 6 bpm, female 172 +/- 7 bpm). 39 +/- 6 % of race time were spent in zone 1, 19 +/- 6 % in zone 2, 20 +/- 3 % in zone 3 and 22 +/- 6 % in zone 4. MTB races are characterized by a high oscillation in P with permanently elevated HR. A highly developed aerobic and anaerobic system is needed to sustain the high variation in workload.
Authors:
B Stapelfeldt; A Schwirtz; Y O Schumacher; M Hillebrecht
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Publication Detail:
Type:  Clinical Trial; Comparative Study; Journal Article    
Journal Detail:
Title:  International journal of sports medicine     Volume:  25     ISSN:  0172-4622     ISO Abbreviation:  Int J Sports Med     Publication Date:  2004 May 
Date Detail:
Created Date:  2004-05-26     Completed Date:  2004-09-28     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8008349     Medline TA:  Int J Sports Med     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  294-300     Citation Subset:  IM    
Affiliation:
Institute of Sports Science, University of Freiburg, Germany. bs@sport.uni-freiburg.de
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MeSH Terms
Descriptor/Qualifier:
Adult
Bicycling / physiology*
Competitive Behavior / physiology
Exercise / physiology*
Female
Heart Rate / physiology
Humans
Male
Muscle, Skeletal / physiology*
Task Performance and Analysis*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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