Document Detail

Comparison of power outputs during time trialing and power outputs eliciting metabolic variables in cycle ergometry.
MedLine Citation:
PMID:  20479484     Owner:  NLM     Status:  MEDLINE    
The authors sought to compare power output at blood lactate threshold, maximal lactate steady state, and pH threshold with the average power output during a simulated 20-km time trial assessed during cycle ergometry. Participants (N = 13) were trained male and female cyclists and triathletes, all permanent residents at moderate altitude (1,525-2,225 m). Testing was performed at 1,525 or 1,860 m altitude. Power outputs were determined during a simulated 20-km time trial (PTT), at blood pH threshold (PpHT), at maximal lactate steady state (PMLSS), and at blood lactate threshold determined by 2 methods: the highest power output that did not result in consecutive and continued increases in blood lactate concentrations from exercising baseline (PLT) and the highest power output that did not result in consecutive and continued increases of > or =1 mmol/L in blood lactate concentrations from exercising baseline (PLT1). PLT, PLT1, and PMLSS were all significantly lower than PpHT (p < .05) and PTT (p < .05). No significant difference was observed between PpHT and PTT (p > .05). Significant correlations were observed between each of the metabolic variables, PLT, PLT1, PMLSS, and PpHT, compared with PTT (p < .05). The authors conclude that, of the 4 metabolic variables, only PpHT offered an accurate reflection of PTT.
David Michael Morris; Rebecca Susan Shafer
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  International journal of sport nutrition and exercise metabolism     Volume:  20     ISSN:  1526-484X     ISO Abbreviation:  Int J Sport Nutr Exerc Metab     Publication Date:  2010 Apr 
Date Detail:
Created Date:  2010-05-18     Completed Date:  2010-06-22     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100939812     Medline TA:  Int J Sport Nutr Exerc Metab     Country:  United States    
Other Details:
Languages:  eng     Pagination:  115-21     Citation Subset:  IM    
Dept. of Health, Leisure, and Exercise Science, Appalachian State University, Boone, NC, USA.
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MeSH Terms
Acid-Base Equilibrium / physiology*
Anaerobic Threshold / physiology*
Bicycling / physiology*
Energy Metabolism / physiology*
Exercise Test
Lactates / blood*
Lactic Acid / blood
Muscle, Skeletal / metabolism
Reg. No./Substance:
0/Lactates; 50-21-5/Lactic Acid

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