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The purpose of this experiment Essay

The purpose of this experiment is to measure the pulse flow of blood through the finger and correlate it with ECG. In addition, we examined the effects of hot and cold temperature on peripheral circulation. It was hypothesized that the temperature and exercise would increase the cardiac cycle and pulse pressure. Three participants were doing the experiment. A 19 year old female, who weighs 110 pound, drinks coffee often times and nonsmoker, did the exercise. A 20 year old female, weighs 135 pounds, non coffee drinker and nonsmoker did the cold temperature.

Also a 20 year old female, weighing 106 pounds, non smoker and non coffee drinker did the hot temperature. Electrodes were placed on left ankle, right hand and left hand. Besides that, pulse transducer was attached in finger. Baseline was established, 3 cardiac cycles and 3 pulse pressures were measured at rest. We did this in the same way for each individual. In addition, we did 3 cardiac cycles and 3 pulse pressure after exercise and temperature experiment. The effect of cold temperature did make variation in heart rate and pulse.

Figure 1 shows that heart rate decreased when participant placed her hand in cold water. In the same way, figure 2 shows decrease in heart rate when the participant placed her hand in hot water. Figure 3 shows that exercise increased the heart rate of the participant. The results we observed for the cold temperature experiment was decrease in temperature. In other words, we observed a gradual decrease in heart rate after the participant put her hands in cold water. In addition, we noticed an increase in pulse rate after the experiment.

Also, we noticed decrease in heart rate and increase in pulse rate for hot temperature experiment. But when I did research I found that the heart rate should increase in cold temperature and should decrease in pulse rate. Also for the hot temperature the heart rate must increase and pulse rate should decrease. So I can not interpret the result. However, for the exercise we noticed increase in heart rate and pulse rate. Resting and exercise heart rate are controlled by the sympathetic and parasympathetic nervous system.

The sympathetic division of the autonomic nervous system prepares the body for physical activity by increasing heart rate, blood pressure and respiration. Once exercise begins, the sympathetic nervous system is activated and the heart rate rises quickly. The parasympathetic division helps slow down heart rate and respiration. At rest, the heart is controlled by the parasympathetic division, which is why the average resting heart rate is 72 bpm or less. During exercise, the release of epinephrine and norepinephrine stimulate receptors in the heart which causes heart rate to increase.

J. Grayson, Reactions of the peripheral circulation to external heat, J Physiology vloume 1, pg 53-63. www. pubmed. com Sandercock, et al. Effect of exercise on heart rate variability, 03/28/2005, www. medscape. com M Buchheit, J J Peiffer, C R Abbiss, P B Laursen. “Effect of cold water immersion on postexercise parasympathetic reactivation. ” American Journal of Physiology : Heart and circulatory physiology 296. 2 (2009): H421. Sciences Module. ProQuest. University Park, PA. 23 Feb. 2009 <http://www. proquest. com

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