Document Detail


Vo2max in overweight and obese adults: do they meet the threshold criteria?
MedLine Citation:
PMID:  19952821     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
PURPOSE: The purpose of this study was to determine whether adiposity affects the attainment of (.)VO2max. METHODS: Sixty-seven male and 68 female overweight (body mass index (BMI) = 25-29.9 kg.m) and obese (BMI > or = 30 kg x m) participants undertook a graded treadmill test to volitional exhaustion (phase 1) followed by a verification test (phase 2) to determine the proportion who could achieve a plateau in (.)VO2 and other "maximal" markers (RER, lactate, HR, RPE). RESULTS: At the end of phase 1, 46% of the participants reached a plateau in (.)VO2, 83% increased HR to within 11 beats of age-predicted maximum, 89% reached an RER of > or = 1.15, 70% reached a blood lactate concentration of > or = 8 mmol x L, and 74% reached an RPE of > or = 18. No significant differences between genders and between BMI groups were found with the exception of blood lactate concentration (males = 84% vs females = 56%, P < 0.05). Neither gender nor fatness predicted the number of other markers attained, and attainment of other markers did not differentiate whether a (.)VO2 plateau was achieved. The verification test (phase 2) revealed that an additional 52 individuals (39%) who did not exhibit a plateau in (.)VO2 in phase 1 had no further increase in (.)VO2 in phase 2 despite an increase in workload. CONCLUSIONS: These findings indicate that the absence of a plateau in (.)VO2 alone is not indicative of a failure to reach a true maximal (.)VO2 and that individuals with excessive body fat are no less likely than "normal-weight" individuals to exhibit a plateau in (.)VO2 provided that the protocol is appropriate and encouragement to exercise to maximal exertion is provided.
Authors:
Rachel E Wood; Andrew P Hills; Gary R Hunter; Neil A King; Nuala M Byrne
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  42     ISSN:  1530-0315     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  2010 Mar 
Date Detail:
Created Date:  2010-02-19     Completed Date:  2010-05-26     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  470-7     Citation Subset:  IM; S    
Affiliation:
School of Human Movement Studies and Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Australia. re.wood@qut.edu.au
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MeSH Terms
Descriptor/Qualifier:
Adiposity / physiology
Adult
Body Mass Index
Exercise Test
Female
Humans
Male
Obesity*
Overweight*
Oxygen Consumption / physiology*
Physical Endurance / physiology
Pulmonary Gas Exchange / physiology
Respiration
Respiratory Function Tests / methods

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


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