Older women exhibit blunted vascular conductance (VC) responses to incremental leg extension exercise compared to active young women¹. However, the age-related effects on the rate at which the vascular conductance response increases at the onset of constant load exercise (VC kinetic response) has not yet been examined. The aim was to investigate leg VC kinetic responses during a high intensity constant-load calf plantar-flexion exercise. Sixteen older (60-75 years) and ten younger (20-35 years) sedentary women were tested. Ethical approval was obtained from the Trinity College Dublin Faculty Research Ethics Committee. Subjects performed three constant load exercise bouts (6 min long) of intermittent calf plantar flexion exercise (6s duty cycle: 2 s contraction, 4 s relaxation) at an intensity of 70% maximum voluntary contraction (MVC) on a custom-built calf ergometer at a tilt of 67 degrees. Calf blood flow was measured contraction by contraction using venous occlusion plethysmography. Kinetic analysis was performed by fitting a biexponential function to the mean (3 bouts) of the vascular conductance (BF/MAP) data. Student t-tests were used to detect differences between groups. The time constant of the fast component was significantly shorter in the young (1.6 ± 1.4 s) compared to the older (3.1 ± 1.7 s) group but the rest of the VC kinetic parameters, the mean response time of the complete response and the end exercise value (amplitude) were not different between both groups. This study showed that the rate at which vascular conductance responses increase during high intensity static calf exercise is similar in young and older women, suggesting similar vasodilatory function in the two groups. These novel findings disagree with a recent study showing reduced VC responses in older active women following a graded static leg-extension exercise¹. The different exercise modalities used in the two studies (calf versus quadriceps muscle exercise) and different fitness levels of the participants (active versus sedentary) may in part explain these differences.