Cardiovascular Effects

Cardiovascular Effects of Exercise

Exercise 1: ECG during rest and after exercise

Study Exercise

Add comments to the recording to indicate the location of each of the follow ing: the P-w ave, the QRS complex,

and the T-w ave.

W hat happened to the R-R interval and the heart rate after exercise?

2.

The R-R interval consists of the sum of QRS, S-T, T-P and P-R. W hich of these became shorter w hen the

heart rate increased?

3.

Immediately after exercise, w as the amplitude of the pulse smaller or larger than in the resting record?

4.

W hat happened to the pulse amplitude during recovery from exercise?

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1.

During exercise, blood flow in the skin and finger pulp is usually reduced by sympathetic vasoconstrictor

nerve activity. After exercise, how ever, skin and finger blood flow may be increased. W hy is the blood flow

to extremities reduced during exercise? W hy does it increase to higher than normal levels during recovery?

W hat other factors may influence the supply of blood to the skin and fingers during and after exercise?

6.

Changes in the cardiovascular system are only some of a number of changes that occur in the body during

and after exercise. W hat other physical changes did you observe in the volunteer?

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5.

Exercise 2: Pulse after hand exercise

Immediately after hand exercise, w as the amplitude of the pulse smaller or larger than in the resting record?

8.

W hat happened to the pulse amplitude during recovery from hand exercise?

9.

The muscles active during hand exercise are mainly in the forearm, w ith a few small muscles in the hand.

W ould you expect blood flow to these muscles to increase during exercise?

10.

There are no muscles in the distal segment of the fingers. W ould you expect the increased muscle blood

flow in exercise to affect the blood flow under the finger pulse transducer?

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