How do we best measure physical activity (lecture 3)

Question 1

If groups in an artifact correlation differ on both variables, what happens to the correlation??

Answer 1

The correlation is artificially inflated

Question 2

What happens if groups in an artefact correlation differ on one variable?

Answer 2

The variability range is increased on that variable and correlation is reduced

Question 3

What happens if range is truncated?

Answer 3

Correlation and available variability is reduced

Question 4

Describe bomb calorimetry in general

Answer 4

Measures energy value.

A food sample is burned with an unlimited supply of oxygen. The heat given off is then measured and the energy per unit weight of amount of heating is calculated.

Question 5

What is DLW and how does it work?

Answer 5

DLW is gold standard for measuring EE in humans.
Individuals drink water containing 2 uncommon isotopes, the clearance rates of these isotopes are then assessed. The difference reflects carbon dioxide production which reflects how much oxygen is being used to produce energy in the body.

Measures BMR, PA, and energy to convert food

Question 6

Explain bomb calorimetry in humans

Answer 6

Measured by performing PA with an unlimited oxygen supply.

The heat given off and power generated by cycling is measured

Question 7

What is a MET?

Answer 7

A metabolic equivalent (1 MET = 1kcal/kg/hour) is the ratio of the active metabolic rate to the resting metabolic
rate