At REST Pulse 12 beats10 seconds BP 311070mmHg What is CO

At REST Pulse = 12 beats/10 seconds. BP = 3110/70mmHg. What is CO? After exercise Pulse = 75 beats/45 sec, BP = 150/95mmHg. What is CO? What is the % change in HR from rest to post exercise?

Solution

Pulse_rest = 12 beats/10 seconds i.e. (12 x 6) beats per minute i.e. 72 beats per minute = Heart rate

BP_rest = 110/70 mmHg which implies 110 is the systolic pressure and 70 is the diastolic pressure

Pulse pressure = Systolic- Diastolic pressure =110-70 = 40

Stroke volume = 1.75 x Pulse pressure = 1.75 x 40 = 70 ml/beat

Cardiac Output COrest = Heart Rate X Stroke Volume

= 72 beats/min x 70 mil/beat

COrest = 5040 mil/min

a.

Pulse_ex = 75 beats/45 seconds i.e. [(75 x 60)/45] beats per minute i.e. 100 beats per minute = Heart rate

BP_ex = 150/95 mmHg which implies 150 is the systolic pressure and 95 is the diastolic pressure

Pulse pressure = Systolic- Diastolic pressure = 150 -95 = 55

Stroke volume = 1.75 x Pulse pressure = 1.75 x 55 = 96.25 ml/beat

Cardiac Output CO_ex = Heart Rate X Stroke Volume

= 100 beats/min x 96.25 mil/beat

COex = 9625 mil/min

b.

change in heart rate from rest to post exercise = (Heart rate post exercise - Heart rate at rest)/(Heart rate at rest)

= (100-72)/72 = 0.3888

% changein HR = 0.3888 x 100 = 38.88%