Electrocardiogram Lab

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Purpose The purpose of this lab is to be able to correctly read and analyze an electrocardiogram and determine how cold conditions, and exercise affect the sequential contractions of the atria.

Hypothesis
It is expected that the beat period, r-pulse interval, and pulse amplitude will be affected by both exercise and after cold conditions have been applied. The cold conditions will slow the heart rate due to vasoconstriction, so the beat period will lengthen resulting in a longer r-pulse interval, as well as a decrease in pulse amplitude. .
After exercise however, there will be an increase in blood heart rate due to vasodilation. This will cause the beat period to shorten, resulting in a shorter r-pulse interval, as well as an increase in
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The chambers include the right and left atrium as well as the right and left ventricle. The atrium receives blood from the venous system while the ventricles pump blood into the arterial system. These pumps are able to provide circulation out to the pulmonary (right pump) and systemic system (left pump). When conducting this lab experiment, it is important to be familiar with an electrocardiogram. An electrocardiogram measures the electrical activity of the heart. The electrocardiogram displays several waves which consists of the P, QRS, and T wave. The P wave records what's happening in the heart. The Sinoatrial node depolarizes sending its signal around the atrial muscle; the atrial depolarizes and then contracts. The next step is the Atrioventriclar node depolarizing. It is going to send its signal through the conductive tissues causing the ventricle to contract. This is called the QRS complex. There is a great amount of size difference between the atria and the ventricle. This is why the P wave is smaller than the QRS complex. Lastly, there is a repolarization in the ventricle. This is known as the T wave (Larson …show more content…
When collecting data for the beat period, pulse amplitude, and pulse interval, two different people calculated it. One person calculated the data for subject one while another person calculated the data for subject two. Because of this, one person could have been calculating it wrong and in a different way than they were supposed to. This could have been the main source of error. The error bars did not vary dramatically. There was minimal deviation in all three conditions. I learned in this lab that when cold conditions or exercise occurs, it will affect your heart rate. Your heart rate will decrease after cold conditions due to vasoconstriction and will increase after exercise due to vasodilation. In an experiment published by J Exercise Rehabilitation, the effects of strenuous exercise on a resting heart rate, blood pressure, and maximal oxygen uptake were investigated. Several subjects were tested. The results showed an increase in heart rate as well as oxygen uptake. (Oh, Hong, & Lee 2016). This ties in with this lab and how after exercise, the vessels dilate making room for more

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