Document Detail


Influence of cardiac functional capacity on gender differences in maximal oxygen uptake in children.
MedLine Citation:
PMID:  10712984     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
OBJECTIVE: To examine the role of gender differences in cardiac functional capacity in explaining higher mean values for maximal oxygen uptake (VO(2)max) in boys than in girls. DESIGN: Comparative group exercise testing. SETTING: Pediatric exercise testing laboratory. SUBJECTS: Twenty-five prepubertal boys (mean [+/- SD] age, 12 +/- 0.4 years) and 24 premenarcheal girls (mean age, 11.7 +/- 0.5 years). INTERVENTIONS: Maximal incremental upright cycle exercise. MEASUREMENTS AND RESULTS: Mean values for VO(2)max were the following: boys, 47.2 +/- 6.1 mL/kg/min; and girls, 40.4 +/- 5.8 mL/kg/min (16.8% difference; p < 0.05). The average maximal stroke index with Doppler echocardiography was 62 +/- 9 mL/m(2) for boys and 55 +/- 9 mL/m(2) for girls (12.7% difference; p < 0.05). No significant gender differences were seen in maximal heart rate or arterial venous oxygen difference. When VO(2)max and maximal stroke volume (SV) were expressed relative to lean body mass, gender differences declined but persisted, falling to 6.2% and 5.2%, respectively. CONCLUSIONS: These findings indicate that differences in SV as well as in body composition contribute to gender-related variations in VO(2)max during childhood. Whether this reflects small gender differences in relative heart size or dynamic factors influencing ventricular preload and contractility during exercise is unknown.
Authors:
T Rowland; D Goff; L Martel; L Ferrone
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Chest     Volume:  117     ISSN:  0012-3692     ISO Abbreviation:  Chest     Publication Date:  2000 Mar 
Date Detail:
Created Date:  2000-04-04     Completed Date:  2000-04-04     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0231335     Medline TA:  Chest     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  629-35     Citation Subset:  AIM; IM    
Affiliation:
Department of Pediatrics (Dr. Rowland, and Mss. Martel and Ferrone), Baystate Medical Center, Springfield, MA 01199, USA.
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MeSH Terms
Descriptor/Qualifier:
Body Composition / physiology
Child
Energy Metabolism / physiology
Exercise / physiology*
Exercise Test
Female
Humans
Male
Myocardial Contraction / physiology
Oxygen / physiology*
Sex Characteristics*
Stroke Volume / physiology*
Chemical
Reg. No./Substance:
7782-44-7/Oxygen
Comments/Corrections
Comment In:
Chest. 2000 Mar;117(3):619-20   [PMID:  10712979 ]

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


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