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Measuring the dependence between blood pressure and time

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Lukasz Weclas Measuring the dependence between blood pressure and hour Date: 17th - 18th of October 2009 Time: 2 hours The aim of the investigation is to examine the dependence between the blood pressure and the hour. The role of the blood is to supply organism with oxygen and nutrients. To reach every part of the body, blood is distributed by artery tissues. Because of the large size of human body, blood is pumped from the heart to arteries under certain pressure enabling in filling its role. It is known that blood pressure is change by many factors, e.g. exercises, eating habits or smoking. Throughout the day, the need for oxygen is changing, causing the change of blood pressure. What is worth investigating is to examine how much blood pressure varies throughout the day and find possible reasons for eventual changes. Hypothesis: Both systolic and diastolic blood pressure will be the highest in the middle of the day, and lowest in the night. Variables: Tab.1 Dependent and independent variables Type of variable Name of variable Unit Uncertainty Tool of control Dependent Blood pressure mmHg ? 5mmHg Stethoscope, watch Age Years ?1 year Inquiry Sport style - - Inquiry Tab.2 Controlled and uncontrolled variables Type of variable Name of variable Unit Methods of control Controlled Part of body that measurements are displayed on ...read more.


The diastolic blood pressure of people Tab.4 Mean systolic and diastolic blood pressure for person Person Mean blood pressure Systolic Diastolic F, 25yo, passive 127 81 F, 48yo, active 125 82 M, 18yo, passive 121 80 M, 47yo, active 130 85 The data from Tab. 4 compare the mean values of blood pressure between the people being objects of the experiment in search for any deviation. Graph 3. Mean values of blood pressure between people Tab.5 Mean systolic and diastolic blood pressure for hour Time Mean blood pressure Systolic Diastolic 00:00 AM 117 80 04:00 AM 120 81 08:00 AM 130 83 12:00 PM 124 78 04:00 PM 135 87 08:00 PM 127 84 00:00 AM 119 78 04:00 AM 121 80 08:00 AM 128 84 12:00 PM 129 81 04:00 PM 132 86 08:00 PM 126 82 The data from Tab. 5 compare the mean values of blood pressure between the people being objects of the experiment in search for any deviation. Graph 4. Mean systolic and diastolic blood pressure for hour (bar chart) Graph 5. Mean systolic and diastolic blood pressure for hour (line chart) Conclusions: The extract below explains how blood pressure is regulated: 'Blood arriving at the carotid bodies carrying a high concentration of carbon dioxide stimulates chemoreceptors in these regions to transmit impulses to the vasomotor centre. ...read more.


In addition the size of sample group was too small to fit more general research. Evaluation: Weaknesses: I. Participants should be asked whether they take any drugs which reduce/increase their heartbeat II. The activity of individuals during the experiment slightly different: they were going to sleep at different times, eating different portions of food etc. - that might have influenced the result Limitations: I. The sphygmomanometer I used was manual, less precise than automatic sphygmomanometer II. In theory 4 people were measured at the same time, but it is impossible with only one sphygmomanometer and one person that takes the measurements. In the result, the time difference between the first and the last person measured can reach 10 minutes. III. Some variables were outside control, e.g. amount of eaten food or stress before work Possible improvements: I. Each age group should consist of the greater number of women II. Bigger sample group should be introduced in order to generalize the outcomes III. A scale for stating whether someone has an active or passive sport style should be elaborated IV. The blood glucose level of each participant could be measured to show the overall physical condition and health of participants 1 "Biological Science 1 & 2. Third edition" D. J. Taylor, N. P. O. Green, G. W. Stout, Cambridge University Press, Cambridge 2006 ?? ?? ?? ?? ...read more.

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