Cardiovascular Effects of Exercise

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 following: the P-wave, the QRS complex,

and the T-wave.

Study Questions

Heart Rate and Pulse Amplitude|

Measurement|Resting |10 s post-exercise|30 s post-exercise|60 s post-exercise|120 s post-exercise|

Heart rate|90|74||||

Pulse amplitude|0.38|0.1||||

ECG Component Intervals|

Interval|Resting |10 s post-exercise|30 s post-exercise|60 s post-exercise|120 s post-exercise|

PR|0.098|0.085|0.088|0.112||

QRS|0.050|0.049|0.051|0.052||

ST|0.202|0.139|0.164|0.173||

TP|0.420|0.238|0.247|0.316||

1. What happened to the R-R interval and the heart rate after exercise?

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2. The R-R interval consists of the sum of QRS, S-T, T-P and P-R. Which of these became shorter when the heart rate increased?

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3. Immediately after exercise, was the amplitude of the pulse smaller or larger than in the resting record?

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4. What happened to the pulse amplitude during recovery from exercise?

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5. During exercise, blood flow in the skin and finger pulp is usually reduced by sympathetic vasoconstrictor nerve activity. After exercise, however, skin and finger blood flow may be increased. Why is the blood flow to extremities reduced during exercise? Why does it increase to higher than normal levels during recovery? What other factors may influence the supply of blood to the skin and fingers during and after exercise?

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6. Changes in the cardiovascular system are only some of a number of changes that occur in the body during and after exercise. What other physical changes did you observe in the volunteer?

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Exercise 2: Pulse after hand exercise

Heart Rate and Pulse Amplitude|

Measurement|Resting|10 s post exercise|30 s post exercise|60 s post exercise|120 s post exercise|

Pulse rate (BPM)|79|||||

Pulse amplitude|0.73|||||

Study Questions

1....