Young, healthy normotensive men who had an acute bout of
resistance exercise were shown to have increased blood flow to limbs despite
increasing central arterial stiffness, whereas those after aerobic exercise had
increased central arterial dispensability but no increase in blood flow,
according to study results.
The study included 10 healthy, moderately active men
aged 21 to 29 years, who were normotensive, nonobese and free from any known CV
or metabolic disease. Researchers assessed forearm blood flow during reactive
hyperemia before and 60 minutes after exercise, whereas aortic and femoral
pulse wave velocity was measured as an index of arterial stiffness before, 40
and 60 minutes after an acute bout of aerobic and resistance exercise.
Central pulse wave velocity decreased 8% after aerobic
exercise and remained at this level through 60 minutes, whereas resistance
exercise increased central pulse wave velocity 9.8% from before exercise to 60
minutes after exercise. Area under the curve for forearm blood flow-reactive
hyperemia significantly increased 38% after resistance
exercise, but no significant change was reported after aerobic exercise.
Additionally, forearm vasodilatory capacity increased after resistance exercise
but not after aerobic exercise.
These findings, the researchers wrote, suggest
“that [resistance exercise] may produce compensatory peripheral vascular
effects, offsetting the increase in central arterial stiffness, while keeping
BP fairly constant after an acute exercise bout. Future studies that measure
endothelial function specifically may provide further evidence to suggest
whether mechanisms responsible for enhanced blood flow are either a transient
compensatory response to arterial stiffness or an increase in signaling of
endothelium-dependent dilators after acute [resistance exercise].”