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|100|151|139|136|38|

Pulse amplitude|0.4|68.01|0.36|0.67|1.44|

ECG Component Intervals|

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

PR|0.165|0.110|0.110|0.124|0.204|

QRS|0.095|0.105|0.075|0.062|0.072|

ST|0.090|0.065|0.095|0.098|0.078|

TP|0.180|0.170|0.150|0.142|0.178|

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

Increase heart rate shorten cardiac cycle decrease RR interval|

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?

Most of this shortening occurs in the TP interval. The QT interval also shortens, but only slightly. Overall intervals shortens as the heart rate increases.|

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

It was much larger. |

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

Decreased significantly|

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?

This is because most oxygen enriched blood would be used by the muscles during exercise that’s why bloodflow to skin is reduces and instead taken closer to...