Document Detail


Oxygen-uptake efficiency slope as a determinant of fitness in overweight adolescents.
MedLine Citation:
PMID:  17909409     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
PURPOSE: Peak oxygen uptake (VO2peak) is frequently difficult to assess in overweight individuals; therefore, submaximal measures that predict VO2peak are proposed as substitutes. Oxygen uptake efficiency slope (OUES) has been suggested as a submaximal measurement of cardiorespiratory fitness that is independent of exercise intensity. There are few data examining its value as a predictor of V O2peak in severely overweight adolescents.
METHODS: One hundred seven severely overweight (BMI Z 2.50 +/- 0.34) and 43 nonoverweight (BMI Z 0.13 +/- 0.84) adolescents, performed a maximal cycle ergometer test with respiratory gas-exchange measurements. OUES was calculated through three exercise intensities: lactate inflection point (OUES LI), 150% of lactate inflection point (OUES 150), and VO2peak (OUES PEAK).
RESULTS: When adjusted for lean body mass, VO2peak and OUES at all exercise intensities were lower in overweight subjects (VO2peak: 35.3 +/- 6.4 vs 46.8 +/- 7.9 mL.kg(-1) LBM.min(-1), P < 0.001; OUES LI: 37.9 +/- 10.0 vs 43.7 +/- 9.2 mL.kg(-1) LBM.min(-1).logL(-1) P < 0.001; OUES 150: 41.6 +/- 9.0 vs 49.8 +/- 11.1 mL.kg(-1) LBM.min(-1).logL(-1) P < 0.001; and OUES PEAK: 45.1 +/- 8.7 vs 52.8 +/- 9.6 mL.kg(-1) LBM.min(-1).logL(-1) P < 0.001). There was a significant increase in OUES with increasing exercise intensity in both groups (P < 0.001). OUES at all exercise intensities was a significant predictor of VO2peak for both groups (r2 = 0.35-0.83, P < 0.0001). However, limits of agreement for predicted VO2peak relative to actual VO2peak were wide (+/- 478 to +/- 670 mL.min(-1)).
CONCLUSIONS: OUES differs significantly in overweight and nonoverweight adolescents. The wide interindividual variation and the exercise intensity dependence of OUES preclude its use in clinical practice as a predictor of VO2peak.
Authors:
Bart Drinkard; Mary D Roberts; Lisa M Ranzenhofer; Joan C Han; Lisa B Yanoff; Deborah P Merke; David M Savastano; Sheila Brady; Jack A Yanovski
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, N.I.H., Intramural    
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  39     ISSN:  0195-9131     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  2007 Oct 
Date Detail:
Created Date:  2007-10-02     Completed Date:  2008-01-11     Revised Date:  2013-06-06    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1811-6     Citation Subset:  IM; S    
Affiliation:
Rehabilitation Medicine Department, Mark O. Hatfield Clinical Research Center, National Institutes of Health, Bethesda, MD, USA.
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MeSH Terms
Descriptor/Qualifier:
Adolescent
Child
District of Columbia
Exercise Test
Female
Humans
Male
Overweight*
Oxygen Consumption / physiology*
Physical Fitness / physiology*
Pulmonary Ventilation / physiology*
Grant Support
ID/Acronym/Agency:
Z01 HD000641-12/HD/NICHD NIH HHS; Z99 HD999999/HD/NICHD NIH HHS
Comments/Corrections

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