Maximal cardiac output was positively correlated with peak femoral blood flow in men (r=0.55 to 0.74; P<0.05) but not in women, indicating a sex-specific balance in vascular reserve.
Cross-Sectional (n=65)
No
Aerobic capacity is associated with peripheral vascular reserve in men but not women, and this sex difference becomes more pronounced with aging.
p-value: p=<0.05
We evaluated the influence of age and sex on the relationship between central and peripheral vasodilatory capacity. Healthy men (19 younger, 12 older) and women (17 younger, 17 older) performed treadmill and knee extensor exercise to fatigue on separate days while maximal cardiac output (Q, acetylene uptake) and peak femoral blood flow (FBF, Doppler ultrasound) were measured, respectively. Maximal Q was reduced with age similarly in men (Y: 23.6 +/- 2.7 vs. O: 17.4 +/- 3.5 l/min; P < 0.05) and women (Y: 17.7 +/- 1.9 vs. O: 12.3 +/- 1.6 l/min; P < 0.05). Peak FBF was similar between younger (Y) and older (O) men (Y: 2.1 +/- 0.5 vs. O: 2.2 +/- 0.7 l/min) but was lower in older women compared with younger women (Y: 1.9 +/- 0.4 vs. O: 1.4 +/- 0.4 l/min; P < 0.05). Maximal Q was positively correlated with peak FBF in men (Y: r = 0.55, O: r = 0.74; P < 0.05) but not in women (Y: r = 0.34, O: r = 0.10). Normalization of cardiac output to appendicular muscle mass and peak FBF to quadriceps mass reduced the correlation between these variables in younger men (r = 0.30), but the significant association remained in older men (r = 0.68; P < 0.05), with no change in women. These data suggest that 1) aerobic capacity is associated with peripheral vascular reserve in men but not women, and 2) aging is accompanied by a more pronounced sex difference in this relationship.
Ridout et al. (Fri,) conducted a cross-sectional in Healthy adults (n=65). Age and sex vs. Younger adults and men was evaluated on Correlation between maximal cardiac output and peak femoral blood flow (p=<0.05). Maximal cardiac output was positively correlated with peak femoral blood flow in men (r=0.55 to 0.74; P<0.05) but not in women, indicating a sex-specific balance in vascular reserve.