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# How Exercise Affects the Body.

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Introduction

Biology Coursework How Exercise Affects the Body Heart rate is the number of heart beats per minute. You can measure it at pulse points on the carotid (neck) and radical (wrist) arteries. Press slightly on the pulse points count the beats for 15 seconds and then multiply it by 4 (15 x 4= 1 minute). Pulse rate is the pumping action of the ventricles of the heart, it is so strong that it can be felt as pulse in the arteries, far away from the heart so therefore pulse is the pressure wave that can be felt corresponding to the heart beat. Resting pulse in an adult is 60 to 80 beats per minute. Here are my results for this investigation. It contains results from two students: Student A- weight 55 kg Time (minutes) No. of Steps per minute First Results beats per minute Second results beats per minute Average Difference between the average b.p.m/ time 0 0 74 78 76 0 1 10 92 90 91 15 2 15 96 98 97 6 3 20 100 102 101 5 4 25 105 108 106.5 5 5 30 125 124 124.5 18 6 35 145 140 142.5 18 7 40 156 151 153.5 11 8 45 165 162 163.5 11 9 50 - 168 168 5 Student B- Weight 62 kg Time(minutes) ...read more.

Middle

They were using this as fuel which the body already had. Between the 4/5th minute student A went over the creatine phosphate supply and went into anaerobic respiration which can be seen on the graph, that the heart beats of student A has increased at a faster rate. At the start it was a steady 5-6 beats per minute increase but as it went in to the 4/5th minute the difference started to increase from 5 to 18 which indicates that Student A has gone into anaerobic respiration his heart beat per minute has increased but, towards the 8/9th minute the rate of increase of the heart beat has decreased, which can be seen on the table, from 11 to 5 b.p.m which suggests that student A is now respiring aerobically and the body is repaying the oxygen debt which occurred during anaerobic exercise. However, student B's heart rate is increasing at a steady rate in whole of the experiment. Even though the student B has a steady rate of increase and it went into anaerobic and aerobic respiration just like Student A but, student B only went up to 7 minutes of exercise which suggests that student B is less fitter than the student B. ...read more.

Conclusion

Evaluation: Although I believe this experiment has produced fairly valid results, I am not sure that the information provided was particularly accurate. For instance, I cannot be sure that the step-up exercise was done at the same rate throughout the experiment. Also, I am not sure how many seconds interval rest was taken in between by student A and B and if it was kept exactly to that timing. On the table first result for Student A does not show the b.p.m. at the 9th minute, as he has shown it in the second result column, it does not give me a fair average as I had to divide it by one instead of two. If I were doing this experiment myself I would have to look closely at the method of exercising used by student A and B. I think that exercising on a piece of equipment like a running machine would produce more accurate results because I would be able to guarantee that the exercise remained constant throughout this experiment. Finally, an actual 'pulse-meter' might have helped the experiment to be more accurate. This is simply strapped round the chest of the exercise and it measures your current heart rate. I believe that this would produce a more accurate heart rate and it would not be necessary to have breaks during the exercise. ...read more.

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