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Investigate how exercise affects my heart rate.

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How Exercise Affects My Heart Rate For my GCSE Biology course work I will investigate how exercise affects my heart rate. Predictions I predict that my heart rate will increase according to the time variable for the exercises and that the recovery time will be lengthen. The increase in the heart rate will occur because the body cells and the muscles involved during the exercise will require energy to function, increasing the time duration of the exercise will require more energy to function. The body cells and the muscles will get the required energy by the process of aerobic respiration. Aerobic respiration is the process where food (carbohydrates/glucose) is converted into energy by using oxygen and the by-products of this process is carbondioxide and water vapour. Food (carbohydrates/glucose)+OxygenEnergy+ carbondioxide+ water vapour If the body cells and the muscles don't get the energy required to function, the body cells and the muscles will get the energy required by the process of anaerobic respiration. SugarEnergy+ lactic acid+ carbondioxide Anaerobic respiration is the process where stored sugar is converted into energy at the absence of oxygen and the by-products are lactic acid and carbondioxide. Anaerobic respiration produces less energy than aerobic respiration, if anaerobic respiration occurs more oftenly during the exercises, more lactic acid and carbondioxide is produced, than the lactic acid combines to make cramps in the muscles. ...read more.


Measurements During the experiment I will measure: * Heart rate- beats per minute (b.p.m) * Recovery period- minutes (min) Safety * I will make sure that the room is safe to carry out the exercises, whether the exercise is safe, if I've plenty of space to perform my exercises and check if the floor doesn't slip. * To over come these problems I will make sure that the exercises are not too strenuous, that I've plenty of space to conduct the exercises and have some resting time after each exercise to allow my heart rate to return to resting level. Analysis & Conclusion * During my investigation I noticed that as I increased the time variable (duration) of the exercises that I've done, my heart rate also increased. The increase in my heart rate was at a steady rate, at an average of 25b.p.m. I also observed that as my heart rate increased so did the recovery period, the increase in the recovery period was lengthen 2 minutes every time I increased the time variable of the exercises. I noticed something else to, that the jogging on the spot exercise gave me a good work out. * My graph tells me that as I increased the time variable of the exercises so does my heart rate. ...read more.


than average (74b.p.m). Reference: * You can see my conclusion and the affects on the heart during exercise is aided by the books, Biology by Mary Jones & Jeff Jones published by Cambridge on page 28 and Human Biology GCSE by Morton Jenkins published by Letts on page 33. * These books show tables on energy use during exercise and supports my predictions and conclusion. Evaluation * I think that my investigation was fair. Since I repeated the exercises and after each time variable I always let my heat rate return to resting level. I kept the same environmental conditions during the investigation. * All of my results fit into the general pattern. * I think that my results are reliable since I followed my plan; I also made sure that it was a fair test and I've done the exercises at a constant speed. * I feel that my procedure was suitable, because I thought of my method and followed it carefully. I also repeated the exercises to make sure that my results were not anomalous. * I think I could improve my investigation by increasing the time variable of the exercises, also doing 4 types of exercises to see which requires more energy and to repeat the exercises at the same resting heart level. These could give me more accurate results. Roshan Barnes 11B ...read more.

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