| Ethnicity affects aerobic fitness in US adolescent girls. | |
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MedLine Citation:
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PMID: 8614319 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The purpose of this investigation was to determine whether aerobic fitness (VO2max) differed between black (N = 40) and white (N = 53) adolescent girls who were similar in age (13.5 yr) and percent body fat (24.6%). Expired gases were collected continuously while each girl performed a standard Bruce protocol to volitional exhaustion on a motorized treadmill (TM). Heart rates (HR) were measured during the exercise testing via telemetry. Fat-free mass (FFM) was estimated with total body electrical conductivity (TOBEC). Average (+/- SD) maximum HR (black = 194 +/- 7; white = 198 +/- 8) and respiratory exchange ratios (black = 1.17 +/- 0.08; white = 1.22 +/- 0.09) did not differ between subject groups. Aerobic fitness was significantly lower (P < 0.01) lower in black versus white girls when VO2max was expressed relative to body weight (31.8 +/- 5.8 vs 38.5 +/- 6.8 ml.kg(-1).min(-1)) and body weight raised to the 0.67 power (120.9 +/- 19.5 vs 138.5 +/- 20.7 ml.kg(-0.67).min-1). Treadmill time to exhaustion was significantly less (P < 0.01) in the black (8.49 +/- 1.30 min) versus white (9.41 +/- 1.60) subjects. Also, black subjects demonstrated less ability to utilize O2 during maximal exercise at a given FFM. This suggests the black girls' FFM contained a smaller percentage of skeletal muscle mass that could be utilized during treadmill exercise. It is possible that lower aerobic fitness values seen in the black girls are related to a combination of anatomical, physiological and/or behavioral factors. |
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Authors:
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J M Pivarnik; M S Bray; A C Hergenroeder; R B Hill; W W Wong |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Medicine and science in sports and exercise Volume: 27 ISSN: 0195-9131 ISO Abbreviation: Med Sci Sports Exerc Publication Date: 1995 Dec |
Date Detail:
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Created Date: 1996-05-31 Completed Date: 1996-05-31 Revised Date: 2004-11-17 |
Medline Journal Info:
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Nlm Unique ID: 8005433 Medline TA: Med Sci Sports Exerc Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 1635-8 Citation Subset: IM; S |
Affiliation:
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Department of Pediatrics, Baylor College of Medicine, Texas Children's Hospital, Houston, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adipose Tissue Adolescent Aerobiosis African Americans African Continental Ancestry Group* Body Composition Body Mass Index Body Weight Electric Conductivity Ethnic Groups European Continental Ancestry Group* Exercise Test Exercise Tolerance Female Heart Rate Humans Muscle, Skeletal / anatomy & histology Oxygen Consumption* Physical Fitness* Pulmonary Gas Exchange Time Factors |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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