Preexisting physical activity level and cardiovascular responses across the Valsalva maneuver.

To determine the effect of preexisting physical activity level on resting cardiovascular measures and the intensity of cardiovascular responses across the Valsalva Maneuver (VM), 131 young (30-55 years) and 67 older (greater than 55 years) healthy adults, classified into sedentary, active, semitrained, or trained groups, were studied. Resting heart rate (HR) was lower in all trained subjects. In contrast, resting diastolic blood pressure was lower in young but not older trained subjects. During the VM, the expected fall in systolic blood pressure (SBP) from baseline during strain was less in young trained but not older trained subjects. Physical training significantly lessened the intensity of SBP and HR responses during the overshoot phase of the VM only in young subjects, most often in young males.