The first portion of the experiment was performed to collect the average

The first portion of the experiment was performed to

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classified into categories that are considered normal and healthy, or can lead to high blood pressure. The first portion of the experiment was performed to collect the average baseline heart rate and blood pressure in the normal position which is at rest in the sitting position. The second portion of the the experiment was performed to collect the average heart rate and blood pressure when a person is recumbent, or laying down. Table 1 summarizes the data collected. It shows that during rest in a sitting position,the average blood pressure for the group is 108 / 72 mmHg in the left arm with the average heart rate at 75 bpm. For the right arm, blood pressure was averaged as 111 / 73 mmHg. The blood pressure recored after a participant was changed to a recumbent position was 112 / 72 mmHg in the left arm and 115 / mmHg in the right arm with blood pressure readings averaging at 68 bpm. Graph one shows that the the average systolic pressure increases when in the recumbent position. The average systolic pressure in resting was 109 mmHg and increased by 5 mmHg to 114 mmHg. However, the heart rate shown in Table 1 decreased in the recumbent positions from 75 to 68 bpm, and diastolic pressure remained close to resting in the sitting position. The results are different from what I expected and are the opposite of my hypothesis. I expected blood pressure to drop when in a recumbent position. My prediction was that the heart must pump harder in the sitting position to circulate blood around the body, specifically to the brain and limbs, and would produce higher systolic blood pressure measurements. The results we got from this experiment may be due to experimental error from the position of the arm, as any small changes in are position can result in different blood pressure differences. A variation in blood pressure measurement could be from the difference in distance of the heart level and arm support in the chair. The results from the experiment could have been from the variability in measurement, there were 4 participants who 10 and 40 who were outside the range of 20 and may have produced values that were way outside the main groups. Further studies can be done to collect more data, and re-test the results from this experiment. For instance, the position of the arm should be accurately placed at heart level which is at the level of the right atrium when collecting blood pressure measurement in the sitting position. A study done from participants within the same age range of 20 may create more precise measurements to compare blood pressure recordings under different condition. References : 1. Silverthorn. Human Physiology An Integrated Approach. 2. Sue Caldwell, Angela Didomenico, Allison Shearer, Ruth Botton. Laboratory Manual for Human Physiology. 3. Exercise: A drug-free approach to lowering high blood pressure - 20045206
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