Document Detail

Is Gross Efficiency Lower at Acute Simulated Altitude as Compared to Sea Level?
MedLine Citation:
PMID:  23070876     Owner:  NLM     Status:  Publisher    
PURPOSE: The purpose of this study was to test the assumption that gross efficiency (GE) at sea level (SL) is representative of GE at altitude (AL). It was hypothesized that an increased cost of ventilation and heart rate, combined with a higher respiratory exchange ratio (RER) at AL might result in a decrease in GE. METHODS: Trained males (n = 16) completed two maximal incremental tests and two GE tests; one at SL and one at an acute simulated AL of 1500 m (hypobaric chamber). GE was determined during submaximal exercise at 45%, 55%, and 65% of the altitude specific power output attained at VO2max. RESULTS: GE determined at the highest submaximal exercise intensity with a mean RER ≤ 1.0, matched for both conditions, was significantly lower at AL (AL 20.7 ± 1.1% and SL 21.4 ± 0.8%, t(15) = 2.9, p < 0.05). CONCLUSION: These results demonstrate that moderate AL resulted in a significantly lower GE during cycling exercise compared to SL. However, it might be that the lower GE at AL is caused by the lower absolute exercise intensity.
Dionne A Noordhof; Thijs Schoots; Derk H Hoekert; Jos J de Koning
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-11
Journal Detail:
Title:  International journal of sports physiology and performance     Volume:  -     ISSN:  1555-0265     ISO Abbreviation:  Int J Sports Physiol Perform     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-16     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101276430     Medline TA:  Int J Sports Physiol Perform     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
MOVE Research Institute Amsterdam, Faculty of Human Movement Sciences, VU University Amsterdam, The Netherlands.
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