OXYGEN DELIVERY OF MEN AND WOMEN AT PEAK WINGATE TEST

Ano: 2007 | Volume: 1 | Número: 3

Autores: Moran Sagiv, Offer Amir, David Ben-Sira, Ruthie Amir

Palavras-chave: strenuous exercise, echocardiograph, cardiac output, fick equation, oxygen extraction

Resumo Inglês:

SAGIV, MORAN; AMIR, OFFER; BEN-SIRA, DAVID; & AMIR, RUTHIE.
Oxygen delivery of men and women at peak wingate test. Brazilian Journal of
Biomotricity. v. 1, n. 3, p. 65-75, 2007. The present study was designed to
investigate the left ventricular function and muscle oxygen delivery in young
men and women at peak Wingate anaerobic test. Young healthy men and
women underwent the Wingate anaerobic test. Two-dimensional direct M-mode
echocardiography studies were performed with the subject seated on a bicycle
ergometer. Arterial O2 was defined from echocardiograph and venous oxygen
content. At rest, left ventricular mass index, end diastolic dimension, maximal
oxygen uptake, stroke volume and cardiac output were all significantly (p <
0.05) higher in men than in women. At peak Wingate anaerobic test, men
compared to women had significantly (p < 0.05) higher values of cardiac output
14.4±0.6 and 12±0.3 l•min-1, respectively) and stroke volume (78.0±5.0 and
69.0±6.1 ml, respectively), while (a-v)O2 (118.5±2.9 and 98.1±3.1 mlO2,
respectively), oxygen uptake (26.3±1.4 and 22.7±1.1 ml•kg1•min1, respectively)
and %VO2 out of total energy utilized (10.0 and 11.8 %, respectively) were
significantly (p < 0.05) lower. This study indicates gender-related differences in
left ventricular response and muscle oxygen delivery of young men and women
at peak all-out strenuous exercise. Data suggest that healthy women response
to the Wingate anaerobic test by increasing their muscle oxygen extraction in
the face of lower oxygen delivery.