energy expenditure lab 4

Question 1

what was the purpose of energy expenditure?

Answer 1

• to gain an understanding of indirect measurements of energy expenditure during exercise using a open circuit spirometry.
• investigate the efficiency of exercise during two difference exercise modes. (cycling and rowing.)

Question 2

what are the direct and indirect methods of energy expenditure?

Answer 2

DIRECT
- a measurement of the amount of heat produced by the body within a calorimetric chamber.

INDIRECT
- the information is put into a computer where the amount of oxygen and carbon dioxide production under a stead state, either at rest or during exercise.

Question 3

what is the difference between Gross energy expenditure vs Net energy expenditure?

Answer 3

GROSS
- total energy expenditure + underlying energy expenditure associated with metabolism =GEE

NET
- if resting energy expenditure is know - GREE to find the energy expenditure associated with exercise alone.

Question 4

what does GME measure?

Answer 4

• GME measures steady state exercise which is used to measure efficiency. (how can I use the least amount of energy and get the most amount of work out of it. most bang for buck.)

Question 5

what are the objectives of energy expenditure lab?

Answer 5

• introduction to the metabolic measurement cart, and are able to interrupt basic metabolic data.
• calculate energy expenditure at rest, rowing, cycling.
• calculate GME during rest, rowing, cycling.

Question 6

calculate NEE for cycling, rowing. use PO. see lab 4 dis. Q

Question 7

for someone who is wanting to lose weight based off of Q1 dis Q. what is the best exercise for losing weight and why>

Answer 7

• the exercise that requires the most amount of muscles being used will allow the individual to lose the most amount of weight. They will loose the most weight because they are using a full body exercise, so More recruitment is happening and more carbs are being used as part of the fuel system.

Question 8

explain some potential differences in GME rowing and cycling.

Answer 8

• biking is more efficient than rowing, because you are not using your upper body like you do in rowing. you are able to put get the most amount of power output with the least amount of work put in.
• slow muscle fibers in biking, and fast twitch muscle fibres in rowing.

Question 9

explain the steady state heart rate (A) power capacity difference that we found working at the same RPE value while rowing and cycling?

Answer 9

• during rowing, the heart rate was higher at a steady beat because the whole body is being used rather than just the lower body muscles in cycling.
• cycling had a lower HR because there are less muscle fibers and recruitment being used.
• the power output was the same for both rowing and cycling, but the RPE was higher in rowing because there is more muscle fibers being used and more recruitment, which means more energy being used.

Question 10

provide some potential physiological explanations for improved GME after prolonged period of sport specific training.

Answer 10

• there are less mucle fibers and recruitment being used and therefore less energy is being used, which allows for more effecentcy. and less demand for oxygen.
• after exercise we become more practiced and neurological recruitment is more efficent, which would allow a change in fibre types.