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Exercise Physiology Lab

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  1. Introduction
  2. Method
  3. Results
  4. Discussion
  5. References

Exercise causes numerous physiological changes in the body. Body temperature increases during exercise because heat is generated in proportion to our need to produce energy. Sweat is a by product of the body heat generated and is sent to the surface of the skin to evaporate and serves as a cooling mechanism. Aerobic exercise leads to the regeneration of ATP which causes an increased need for oxygen and an increased production of carbon dioxide. These two gases must be delivered and removed for the muscles to function properly. Oxygen is brought into the lungs of the body via inhalation and transferred from the pulmonary circuit to the heart via hemoglobin. The oxygenated blood passes through the heart and out into the body's organs. Some hemoglobin red blood cells deliver the oxygenated blood to skeletal muscle being contracted during exercise. The muscle uses the oxygen to regenerate ATP aerobically. This process also produces carbon dioxide as a waste product. The carbon dioxide diffuses into capillary blood and travels back up through the heart and into the pulmonary circuit where it is taken to the lungs and disposed of by exhalation.

[...] Regardless of the unnaturally high heart rates to begin, all three increased throughout the bout and experienced the highest rate at the end of the exercise, whether it was after nine or twelve minutes depending on the length of exercise for each subject. Once the subjects entered the recovery phase their heart rates began to drop and return to normal. These results strongly supported my hypothesis. Heart rate is the measure of beats per minute and is reflective of the amount of stress put on the system and thus a rise in heart rate is always observed while exercising and the more strenuous an exercise gets (i.e. [...]

[...] The exercise data points were collected while the subject's were in motion, forty-five seconds prior to the incline increase. Two of the subjects ran for twelve minutes and one ran for nine minutes. The subjects were allowed to stop exercising at any point during the experiment. An exercise heart rate for each subject was calculated prior to the experiment in order to maintain a controlled experiment. The calculated heart rate prevented the subjects from exceeding 80% of their maximum heart rate. [...]

[...] Both will increase over the course of exercise as the body's need for oxygen increases, more will be consumed, and carbon dioxide will need to be cleared as a byproduct of the oxygen powering the regeneration of ATP. Body temperature will be lowest to start also. The temperature will increase throughout the exercise and then body temperature will gradually cool down during recovery. The increased need for oxygen to regenerate ATP will cause the hemoglobin saturation to increase during exercise. [...]

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