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The effects of metabolic rate and oxygen consumption

The effects of metabolic rate and oxygen consumption -...

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Brittany Poyer TA-Jessica Durrant Lab Report-Metabolism March 2 nd , 2007 The effects of metabolic rate and oxygen consumption in response to increased workloads across genders Abstract: The experiment examined the changes in metabolic rate and oxygen consumption in relation to increased exercise workloads. More specifically, the body mass and V02 across genders were analyzed . To conduct the experiment, 8 subjects resting V02 and VC02 levels were measured both sitting and lying, and during exercise. The subject's tidal volume (mUbreath) and breathing rate (breaths/min) gas measurements were also taken with the gradual increase in watts. The subject pedaled at a steady state of exercise until fatigued. The levels of V02 and VC02 observed increased with workload and exercise intensity. Fuel utilization, Respiratory quotient (RQ) was also measured. The results obtained from the graphs in the experiment often times suggested no significance by looking at the p value obtained from the t tests. Given the environment, outside factors, limited sample size, these are a few of the factors that could have accounted for the experimental errors. A limited matched study of 02 consumption and body mass seemed that male and female differences could be partially explained by their muscle composition in terms of fiber size, hormonal variation, endurance levels and general muscular strength. Introduction: Metabolic rate is defined as the rate at which energy is expended by the body during both external and internal work; and can be calculated by dividing the energy expenditure by time. (Hayes, Osajan 2007). During exercise, you are increasing external work, which could therefore
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be assumed, that metabolic rate would also increase. Metabolic rate and workload are directly proportional, as metabolic rate increases, the amount of 02 used and C02 produced would also increase. Due to the circumstances in the lab, investigators were forced to rely on indirect calorimetry as the method to measure metabolic rate. Indirect calorimetry relies on the stoichiometric relation between substances consumed by the body and the resulting products. The following equation displays the direct relationship that exists between the volume of 02consumed and the amount of heat produced: Foodstuffs (CHO, fats, proteins) +02~CCh + H20 + energy + heat (Hayes, Osajan 2007) The goal in this lab was to measure the V02 and the VC02 and compare their relationships to the increase in workload of the subject. As workload increased an increase in V02 and the VC02 was also expected. To obtain a value as close as possible to the basal metabolic rate, the resting V02 value was measured for the subject sitting versus reclining. It was expected, that the V02 would be lower when reclining than sitting because sitting would require more contraction of the muscles in the lower back for support and ultimately and increase in ATP production linked to an increase in V02 consumption. To further support the results, and provide a possible means for
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