UMass Amherst KIN 470 - kin 470 lab report 3 (9 pages)

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kin 470 lab report 3



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kin 470 lab report 3

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Pages:
9
School:
University of Massachusetts Amherst
Course:
Kin 470 - Exercise Physiology

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Victoria Newbury Lab Section Tuesday 1 00 PM Date 3 7 14 Ben Hoffman Lab Report 3 Maximum Oxygen Consumption INTRODUCTION VO2 max is the maximal amount of oxygen that can be consumed by the body despite any increases in exercise intensity and is an indicator of aerobic fitness level Energy expended above this level of oxygen consumption is performed using anaerobic respiration VO2 max is limited by the ability to consume oxygen and the ability to deliver oxygen to the cells in the body A limiting factor for delivery of oxygen is that the body needs to remove carbon dioxide from the system via hemoglobin During intense exercise the amount of carbon dioxide is greatly increased Because oxygen is also carried by hemoglobin there is competition to bind to hemoglobin thus limiting the amount of oxygen that can be delivered Oxygen delivery is also limited by cardiac output Cardiac output is the amount of blood being pumped by the heart per minute and calculated by multiplying heart rate by stroke volume The more blood being pumped by the heart per minute the more oxygen that can be delivered However stroke volume can only increase until about 40 of VO2 max Therefore increases in cardiac output are more reliant upon increases in heart rate Maximal heart rate can be calculated for individuals based on their age subtracted from 220 Oxygen utilization is dependent upon the capabilities of the cells Cells that are better adapted to exercise will be able to utilize more oxygen Adaptations include increased size and number of mitochondria increased capillary density improved aerobic enzyme activity and muscle perfusion Cellular adaptations occur with training levels the more training an individual has the better their adaptations Oxygen utilization can be calculated using the formula for AVDO2 AVDO2 is the difference in oxygen content between arterial and venous blood The arteries carry blood away from the heart either to the lungs or to the rest of the body and the veins carry



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