当前位置： SCI文献检索 > MEDICINE AND SCIENCE IN SPORTS AND EXERCISE期刊下所有文献 > Hemoglobin, muscle oxidative capacity, and VO2max in African-American and Caucasian women.

Hemoglobin, muscle oxidative capacity, and VO2max in African-American and Caucasian women.

Abstract：

PURPOSE:The purpose of this paper was to determine whether differences in hemoglobin (Hb) and muscle aerobic capacity exist between African-American (AA) and Caucasian (CA) premenopausal women and to determine whether Hb and aerobic capacity of the muscle are associated with the racial differences in maximum oxygen uptake (VO2max). METHODS:43 AA and 46 CA sedentary premenopausal women were subjects. Percent body fat was determined by four-compartment model, leg lean tissue by dual energy x-ray absorptiometry, VO2max during a graded exercise test, aerobic capacity of the calf muscle by 31P magnetic resonance spectroscopy, and serum Hb by the cyanide method. RESULTS:AA women had reduced VO2max (AA 29.3 +/- 3.0 vs CA 33.6 +/- 5.6 mL.kg(-1) bdw(-1).min, P < 0.01), reduced muscle aerobic capacity (AA 24.3 +/- 5.8 vs CA 21.3 +/- 4.8 s, P = 0.01, where lower values indicate higher aerobic capacity), and reduced Hb (AA 11.8 +/- 1.3 vs CA 12.9 +/- 0.8 g.dL(-1), P < 0.01). The racial difference in VO2max persisted whether the values were unadjusted or adjusted for fat-free mass or leg lean tissue. Multiple regression analysis revealed that both Hb and muscle aerobic capacity were related to VO2max after adjusting for each other, race, and either fat-free mass or leg lean tissue. Being AA was associated with reduced VO2max in mL O2.kg leg lean tissue(-1).min(-1) (zero-order simple Pearson-product correlation -0.60, P < 0.01). When multiple regression was used, the correlation between race and VO2max decreased but persisted (-0.40, <0.01) after adjusting for Hb and muscle aerobic capacity. CONCLUSIONS:These data suggest that differences in Hb and aerobic capacity of muscle are related to reduced VO2max in AA women. However, Hb and aerobic capacity of the muscle can only partially explain the racial differences in VO2max.

journal_name

Med Sci Sports Exerc

journal_title

Medicine and science in sports and exercise

authors

Hunter GR,Weinsier RL,McCarthy JP,Enette Larson-Meyer D,Newcomer BR

doi

10.1097/00005768-200110000-00019

subject

Has Abstract

pub_date

2001-10-01 00:00:00

pages

1739-43

issue

eissn

0195-9131

issn

1530-0315

journal_volume

pub_type

杂志文章

在线工具

Hemoglobin, muscle oxidative capacity, and VO2max in African-American and Caucasian women.