Response to upright exercise after XXXX .

@entity1 @entity64 @entity998 @entity1009 @entity583
The left ventricular response to upright bicycle exercise was studied in 39 unselected, non-beta blocked @entity1 (mean(SEM) age 54.2(1.7)yr) (mean(SEM) resting ejection fraction 41.9(2.3)%) 8-10 weeks after @entity583 . Nine healthy, age matched, sedentary adult @entity1 were studied for comparison (mean(SEM) age 49.8(0.9)yr). The @entity64 volume and cardiac output were measured by impedance cardiography at rest and after each 3 min workload until symptom limited maximum. The @entity1 were separated into three groups based on @entity64 volume response to graded exercise. Group 1 (n = 14) had a normal @entity64 volume response to increasing heart rate. In group 2 (n = 13) @entity64 volume increased initially then decreased by greater than 15% at a heart rate greater than 100-105 beats. @entity1009 . In group 3 (n = 12) @entity64 volume failed to increase during exercise. In group 1 cardiac output and mean arterial pressure increased whereas vascular resistance decreased during exercise in a normal fashion. Group 2 had an increased mean arterial pressure and systemic vascular resistance throughout exercise while heart rate increased in a similar fashion to group 1 until work of greater than 70 W was undertaken, at which time heart rate increased in a curvilinear fashion and cardiac output was attenuated. Group 3 had an @entity998 and a higher heart rate during exercise. In this group of @entity1 systemic vascular resistance failed to decrease normally during exercise.(ABSTRACT TRUNCATED AT 250 WORDS)
