Impact of altitude on power output during cycling stage racing

Journal article


Lewis, Laura, Clark, Bradley, Martin, David T., Schumacher, Yorck O., McDonald, Warren, Stephens, Brian, Ma, Fuhai, Thompson, Kevin G., Gore, Christopher J. and Menaspà, Paolo. (2015). Impact of altitude on power output during cycling stage racing. PLoS ONE. 10(12), pp. 1 - 15. https://doi.org/10.1371/journal.pone.0143028
AuthorsLewis, Laura, Clark, Bradley, Martin, David T., Schumacher, Yorck O., McDonald, Warren, Stephens, Brian, Ma, Fuhai, Thompson, Kevin G., Gore, Christopher J. and Menaspà, Paolo
Abstract

Purpose
The purpose of this study was to quantify the effects of moderate-high altitude on power output, cadence, speed and heart rate during a multi-day cycling tour.
Methods
Power output, heart rate, speed and cadence were collected from elite male road cyclists during maximal efforts of 5, 15, 30, 60, 240 and 600 s. The efforts were completed in a laboratory power-profile assessment, and spontaneously during a cycling race simulation near sea-level and an international cycling race at moderate-high altitude. Matched data from the laboratory power-profile and the highest maximal mean power output (MMP) and corresponding speed and heart rate recorded during the cycling race simulation and cycling race at moderate-high altitude were compared using paired t-tests. Additionally, all MMP and corresponding speeds and heart rates were binned per 1000m (<1000m, 1000–2000, 2000–3000 and >3000m) according to the average altitude of each ride. Mixed linear modelling was used to compare cycling performance data from each altitude bin.
Results
Power output was similar between the laboratory power-profile and the race simulation, however MMPs for 5–600 s and 15, 60, 240 and 600 s were lower (p ≤ 0.005) during the race at altitude compared with the laboratory power-profile and race simulation, respectively. Furthermore, peak power output and all MMPs were lower (≥ 11.7%, p ≤ 0.001) while racing >3000 m compared with rides completed near sea-level. However, speed associated with MMP 60 and 240 s was greater (p < 0.001) during racing at moderate-high altitude compared with the race simulation near sea-level.
Conclusion
A reduction in oxygen availability as altitude increases leads to attenuation of cycling power output during competition. Decrement in cycling power output at altitude does not seem to affect speed which tended to be greater at higher altitudes.

KeywordsGarvican; Garvican-Lewis
Year2015
JournalPLoS ONE
Journal citation10 (12), pp. 1 - 15
PublisherPublic Library of Science
ISSN1932-6203
Digital Object Identifier (DOI)https://doi.org/10.1371/journal.pone.0143028
Scopus EID2-s2.0-84955455523
Open accessOpen access
Page range1 - 15
Research GroupMary MacKillop Institute for Health Research
Publisher's version
License
Place of publicationUnited States of America
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