Document Detail


Exercise intensity and oxygen uptake kinetics in African-American and Caucasian women.
MedLine Citation:
PMID:  21717119     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The effect of exercise intensity on the on- and off-transient kinetics of oxygen uptake (VO(2)) was investigated in African American (AA) and Caucasian (C) women. African American (n = 7) and Caucasian (n = 6) women of similar age, body mass index and weight, performed an incremental test and bouts of square-wave exercise at moderate, heavy and very heavy intensities on a cycle ergometer. Gas exchange threshold (LT(GE)) was lower in AA (13.6 ± 2.3 mL kg(-1) min(-1)) than C (18.6 ± 5.6 mL kg(-1) min(-1)). The dynamic exercise and recovery VO(2) responses were characterized by mathematical models. There were no significant differences in (1) peak oxygen uptake (VO(2peak)) between AA (28.5 ± 5 mL kg(-1) min(-1)) and C (31.1 ± 6.6 mL kg(-1) min(-1)) and (2) VO(2) kinetics at any exercise intensity. At moderate exercise, the on- and off- VO(2) kinetics was described by a monoexponential function with similar time constants τ (1,on) (39.4 ± 12.5; 38.8 ± 15 s) and τ (1,off) (52.7 ± 10.1; 40.7 ± 4.4 s) for AA and C, respectively. At heavy and very heavy exercise, the VO(2) kinetics was described by a double-exponential function. The parameter values for heavy and very heavy exercise in the AA group were, respectively: τ (1,on) (47.0 ± 10.8; 44.3 ± 10 s), τ (2,on) (289 ± 63; 219 ± 90 s), τ (1,off) (45.9 ± 6.2; 50.7 ± 10 s), τ (2,off) (259 ± 120; 243 ± 93 s) while in the C group were, respectively: τ (1,on) (41 ± 12; 43.2 ± 15 s); τ (2, on) (277 ± 81; 215 ± 36 s), τ (1,off) (40.2 ± 3.4; 42.3 ± 7.2 s), τ (2,off) (215 ± 133; 228 ± 64 s). The on- and off-transients were symmetrical with respect to model order and dependent on exercise intensity regardless of race. Despite similar VO(2) kinetics, LT(GE) and gain of the VO(2) on-kinetics at moderate intensity were lower in AA than C. However, generalization to the African American and Caucasian populations is constrained by the small subject numbers.
Authors:
Nicola Lai; Fatima Tolentino-Silva; Melita M Nasca; Marco A Silva; L Bruce Gladden; Marco E Cabrera
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Publication Detail:
Type:  Comparative Study; Journal Article; Randomized Controlled Trial; Research Support, N.I.H., Extramural; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2011-06-30
Journal Detail:
Title:  European journal of applied physiology     Volume:  112     ISSN:  1439-6327     ISO Abbreviation:  Eur. J. Appl. Physiol.     Publication Date:  2012 Mar 
Date Detail:
Created Date:  2012-02-10     Completed Date:  2012-06-19     Revised Date:  2013-06-28    
Medline Journal Info:
Nlm Unique ID:  100954790     Medline TA:  Eur J Appl Physiol     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  973-82     Citation Subset:  IM    
Affiliation:
Department of Biomedical Engineering, Case Western Reserve University, 10900 Euclid Avenue, Wickenden Bldg. Rm 524, Cleveland, OH 44106-7207, USA. nicola.lai@case.edu
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MeSH Terms
Descriptor/Qualifier:
Adult
African Americans*
European Continental Ancestry Group*
Exercise / physiology*
Exercise Test
Female
Humans
Oxygen / pharmacokinetics*
Oxygen Consumption / physiology*
Physical Endurance / physiology
Physical Exertion / physiology*
Pulmonary Gas Exchange / physiology
Young Adult
Grant Support
ID/Acronym/Agency:
GM088823/GM/NIGMS NIH HHS; GM6630901/GM/NIGMS NIH HHS; K25 AR057206/AR/NIAMS NIH HHS; K25 AR057206-02/AR/NIAMS NIH HHS; P50 GM066309/GM/NIGMS NIH HHS; P50 GM066309-05/GM/NIGMS NIH HHS; R01 GM088823/GM/NIGMS NIH HHS; R01 GM088823-04/GM/NIGMS NIH HHS
Chemical
Reg. No./Substance:
7782-44-7/Oxygen
Comments/Corrections

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