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Research Question: Does the duration of exercise have an increased effect on a persons heart rate?

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Introduction

Aim: Investigate the effect of a factor on Heart Rate Introduction: People exercise on a daily basis for a variety of reasons. With exercise people often find themselves short of breath and must breathe deeply and more often in order to compensate. Due to the fact that exercise causes someone to breathe more rapidly, it would also seem that it also increases someone's heart rate. In order to gauge the effect of exercise on someone's heart rate, this lab will vary the periods of exercise that one undergoes and heart rate will be recorded afterwards. It would seem that the longer the duration of the exercise, the higher the heart rate will be. Research Question: Does the duration of exercise have an increased effect on a person's heart rate? Independent Variable: The duration of exercise - Exercise will occur for periods of 0 seconds, 45 seconds and 90 seconds after each heart rate will be recorded Dependent Variable: The heart rate of a person in beats per minute - Immediately after exercise students will find their pulse on their neck and count the number of beats they feel in a sixty second time period Control Variable: -Pulse will be found at one's neck each time. This is done to avoid confusion when counting pulse and so that in case pulse recorded varies in other parts of the body such as the wrist such error can at least be consistent. ...read more.

Middle

calculations it became unnecessary to record uncertainty Calculations: Sample Calculation for Average Heart Rate in beats per minute Average Heart Rate in beats per minute = (Subject 1 Trial 1 + Subject 1 Trial 2 + Subject 2 Trial 1 + Subject 2 Trial 2 + Subject 3 Trial 1 + Subject 3 Trial 2 + Subject 4 Trial 1+ Subject 4 Trial 2+ Subject 5 Trial 1 + Subject 5 Trial 2+ Subject 6 Trial 1 + Subject 6 Trial 2+ Subject 7 Trial 1 + Subject 7 Trial 2 + Subject 8 Trial 1 + Subject 8 Trial 2 + Subject 9 Trial 1 + Subject 9 Trial 2 + Subject 10 Trial 1 + Subject 10 Trial 2) Increment One = 0 Seconds Total Number of Trials= 20 Average Heart Rate in beats per minute = (60+74+76+80+78+82+78+84+84+58+70+98+72+96+74+96+66+74+90+96) / (20) Average Heart Rate in beats per minute "increment one of 0 seconds" = 79.30 seconds Average Heart Rate in beats per minute "increment two of 45 seconds" =135.6 seconds Average Heart Rate in beats per minute "increment three of 90 seconds" = 152.2 seconds Round to 4 significant figures in all cases to keep consistent with the bigger heart rates. Sample Calculation for Standard Deviation Input column "Increment One 0 Seconds" into graphing calculator Calc "1-Var Stats" One Standard Deviation = 11.38902981 seconds Round to 4 significant figures because smallest unit of data in the averages is 4 significant figures One Standard Deviation = 11.40 seconds One Standard Deviation "Increment One 0 seconds" ...read more.

Conclusion

While this was not significant enough to discard the duration of exercise as a factor affecting heart rate, it did inhibit the conclusion in terms of how effective duration of exercise is and continually affecting heart rate. Another Weakness is the way in which people recorded their pulse. While everyone recorded their pulse by using their neck some students reported issues with finding their pulse during the seconds following their exercise. This means that after long durations of exercising greater and greater amounts of beats were never recorded impacting the data to the point where increments two and three significantly overlapped in their error bars. In order to improve the lab and reduce the overlap of the error bars exhibiting standard deviation the procedure should be modified with at least two changes. The first improvement would be assigning a lead student who would set the pace of jumping jacks which would ensure that everyone would be exercising at the same rate. Another improvement would be having each student pair up with another student. Half the students could do jumping jacks while half the students watch. Once done jumping jacks, the resting students could record their partner's jumping jacks for them. To do this they would learn how to find their partners pulse beforehand. This would effectively eliminate the beats lost to error in finding one's own heartbeat. Together these improvements would help reduced the overlap that occurs in the error bars of standard deviation by making results more consistent in two ways. The type of exercise is streamlined even more and the method for recording pulse is improved. ...read more.

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