Metabolism Lab Report Sample

Metabolism Lab Report Paper The purpose of this lab was to see how the changes in exercise intensity affect the rate of metabolism within the body. Methods: In this lab, indirect calorimeter was used to measure metabolic rate by calculating caloric expenditure by the measurements of oxygen consumption. The variables measured were the fraction of oxygen expired, the fraction of carbon dioxide expired, and the total volume of air inspired. This experiment required the participation of two volunteers. First, the variables were measured variables while the two subjects were in a resting state. Readings were taken over a period of three minutes and averaged so that it could be assumed that the subjects were in a steady physiological state. After taking readings at a resting metabolic state, these variables were measured again while the subjects were performing light exercises: on a cycling bike and on a treadmill. The first exercise was on a cycle with 1 kip of resistance at 50 RPM. Data was measured in the third minute and recorded. This was followed by another three minutes on the cycle with 2 kip of resistance at 50 RPM. Again data was measured in the third minute and recorded. The second exercise was on a treadmill at 3. MPH with no grade, followed by 4. 0 MPH at a 7. 5% grade. Each session on the treadmill lasted three minutes and the data was measured and recorded in the third minute during both cases on the treadmill. Once all of these measurements were collected and recorded for both subjects, the absolute oxygen consumption, relative oxygen consumption, absolute ca rbon dioxide production, the respiratory exchange ratio (R), and ultimately Caloric expenditure were all measured. Studying these calculations provide some insight into how much energy the body is using as well s what sources the energy is coming from. 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At rest, you would expect to see a little over 1 MET, since these objects were in a resting metabolic state, not a basal metabolic state. This is equivalent to slightly over 3. 5 ml 02/keg/min. At rest and in a post-absorptive, you would expect to see R near . 7 since the body would be burning fats. As the intensity of exercise is increased, you expect for R to increase towards 1. 0 because it is easier for the body to obtain TAP quickly from burning glucose than from burning fat. B. There would definitely be a different caloric expenditure between a large person and a small person based on whether or not the activity is weight bearing or non-weight bearing. On a treadmill, you should expect to see different caloric expenditures for people of different sizes. Since this is a weight bearing exercise, a person that is heavier will burn more calories on a treadmill at a given speed and incline than a smaller person. This difference is not really seen in non-weight exercise. In contrast, using the cycle regretted, a non-weight bearing exercise, you would not expect to see as much of a difference in calories burned based on size. C. The advantage of expressing oxygen consumption relative to body weight (VEERED in ml/keg/min) versus absolute oxygen consumption (BASS in L/min) is that it takes into account other factors including body weight rather than just oxygen consumption. Using absolute oxygen consumption as a method of comparing people would not be accurate. By expressing oxygen consumption on a per kilogram basis, we can accurately compare people that are of different sizes. D. I weigh approximately 53 keg, so multiplying 3. 5 ml 02/min by 53 keg gives 0. 1855 L 02 consumed per minute. To determine how many liters of oxygen are consumed in a day we must multiply by 60 for the 60 minutes that are in an hour and then by 24 for the number of ours in a day. That gives me a total of 267. 12 liters of oxygen per day. Finally multiply the 267. 12 liters of oxygen per day by 5 kcal per liter to get a daily caloric expenditure of 1335. 6 kcal. E. Some factors that we can control that affect basal metabolic rate and resting metabolic rate are body surface area, body composition, caloric intake, and physical activity. An increase in any of these factors will also lead to an increase in ARM. There are also factors that we have no control of. These factors include age, genetics, and gender. With age n mind, as people get older resting metabolic rate decreases.