Document Detail

Rapidity of Response to Hypoxic Conditions during Exercise.
MedLine Citation:
PMID:  23113952     Owner:  NLM     Status:  Publisher    
Previous studies have found decreases in arterial oxygen saturation (SaO2) to be temporally linked to reductions in power output (PO) during Time Trial exercise (TT). The purpose of this study was to determine whether pre-exercise desaturation (estimated from pulse oximetry (SpO2), via normobaric hypoxia, would change the pattern of PO during a TT. PURPOSE: We tested the hypothesis that the starting PO of a TT would be reduced in the EARLY trial secondary to a reduced SpO2, but would not be reduced in LATE until ~30s after the start of the TT. METHODS: Eight trained cyclists/triathletes (4 male, 4 female) performed three randomly ordered 3 km TT while breathing either room air (CONTROL) or hypoxic air administered 3 min before the start of the TT (EARLY) or at the beginning of the TT (LATE). RESULTS: There was no effect of hypoxia on PO during the first 0.3-km of either the EARLY or LATE trials compared to CONTROL, although there was a significant decrease in pre-TT SpO2 in EARLY vs CONTROL and LATE. The time for PO to decrease was ~40 seconds after the start of the TT in both EARLY and LATE. CONCLUSIONS: The results support the strong effect of the pre-exercise template on the pattern of PO during simulated competition, and suggest that reductions in SpO2 are not direct signals to decrease PO.
Kayla B Henslin; Carl Foster; Jos J de Koning; Christopher Dodge; Glenn A Wright; John P Porcari
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-30
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:  2012-11-1     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:  -    
Department of Exercise and Sport Science, University of Wisconsin-La Crosse.
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