Document Detail


Air-braked cycle ergometers: validity of the correction factor for barometric pressure.
MedLine Citation:
PMID:  11071051     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Barometric pressure exerts by far the greatest influence of the three environmental factors (barometric pressure, temperature and humidity) on power outputs from air-braked ergometers. The barometric pressure correction factor for power outputs from air-braked ergometers is in widespread use but apparently has never been empirically validated. Our experiment validated this correction factor by calibrating two air-braked cycle ergometers in a hypobaric chamber using a dynamic calibration rig. The results showed that if the power output correction for changes in air resistance at barometric pressures corresponding to altitudes of 38, 600, 1,200 and 1,800 m above mean sea level were applied, then the coefficients of variation were 0.8-1.9% over the range of 160-1,597 W. The overall mean error was 3.0 % but this included up to 0.73 % for the propagated error that was associated with errors in the measurement of: a) temperature b) relative humidity c) barometric pressure d) force, distance and angular velocity by the dynamic calibration rig. The overall mean error therefore approximated the +/- 2.0% of true load that was specified by the Laboratory Standards Assistance Scheme of the Australian Sports Commission. The validity of the correction factor for barometric pressure on power output was therefore demonstrated over the altitude range of 38-1,800 m.
Authors:
J P Finn; B F Maxwell; R T Withers
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  International journal of sports medicine     Volume:  21     ISSN:  0172-4622     ISO Abbreviation:  Int J Sports Med     Publication Date:  2000 Oct 
Date Detail:
Created Date:  2001-02-23     Completed Date:  2001-03-01     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:  488-91     Citation Subset:  IM    
Affiliation:
Exercise Physiology Laboratory, School of Education, Flinders University, Adelaide, Australia. bob.withers@flinders.edu.au
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MeSH Terms
Descriptor/Qualifier:
Altitude
Atmospheric Pressure*
Calibration
Ergometry / instrumentation*
Humidity
Temperature

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


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