Document Detail


Relationship between blood lactate response to exercise and endurance performance in competitive female master cyclists.
MedLine Citation:
PMID:  9351693     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The blood lactate response to graded exercise and its relationship to performance in the field was examined in highly competitive female master cyclists. Thirteen women, age 47.5+/-2.2yr (mean+/-SE), all of whom were United States Cycling Federation (USCF) competitors, underwent laboratory testing for aerobic capacity (VO2max) and lactate threshold (LT), and field testing for performance in 13.5 km and 20 km time-trials. The mean VO2max of the subjects (50.6+/-2.7 ml x kg(-1) x min[-1]) was approximately 10% higher than that previously reported for other age-matched female athletes and correlated moderately (r=-0.67) with age. Maximal heart rate was unrelated to age (r=-0.25, p>0.05). Blood lactate concentration (BLC) while time-trialing was significantly higher than that at the LT (2.86+/-0.17 mmol x l[-1]) for both the 13.5 km (7.59 mmol x l(-1), p < 0.0001), and the 20 km trials (6.99 mmol x l(-1), p<0.002). The LT occurred at a mean power output of 168+/-11.3 W and 66% of VO2max. The VO2 corresponding to a BLC of 4.0 mmol x l(-1) (LT4) was 72% of VO2max. As expected, time-trial performance was highly correlated with VO2max (r=-0.85); however, regression analysis indicated that power output at the lactate threshold was the best laboratory predictor of performance (13.5 km: r2 = 0.83; 20 km: r2 = 0.78). Relative to maximal heart rate, heart rate at LT (88% HRmax) was significantly (p<0.05) lower than time-trial heart rate (92-94% HRmax). The cyclists in this study have higher aerobic capacities and maximal heart rates than those previously reported for other age-matched female athletes and are able to cycle for extended periods at blood lactate concentrations significantly higher than those at the lactate threshold. Traditional methods of exercise prescription, particularly when using age-estimates of maximal heart rate, underestimate training intensities required to be above the LT in female master cyclists.
Authors:
J F Nichols; S L Phares; M J Buono
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  International journal of sports medicine     Volume:  18     ISSN:  0172-4622     ISO Abbreviation:  Int J Sports Med     Publication Date:  1997 Aug 
Date Detail:
Created Date:  1997-11-25     Completed Date:  1997-11-25     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  8008349     Medline TA:  Int J Sports Med     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  458-63     Citation Subset:  IM    
Affiliation:
Department of Exercise & Nutritional Sciences, San Diego State University, CA 92182-0171, USA. jnichols@mail.sdsu.edu
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MeSH Terms
Descriptor/Qualifier:
Adult
Aged
Bicycling / physiology*
Exercise / physiology*
Female
Heart Rate
Humans
Lactic Acid / blood*
Middle Aged
Oxygen Consumption
Physical Endurance / physiology*
Chemical
Reg. No./Substance:
50-21-5/Lactic Acid

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


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