W8 Review - HES 105

What is used to measure metabolic rate?

indirect calorimetry

What does the measuring of metabolic rate using indirect calorimetry involve?

measurement of O2 consumption and CO2 production

Compared to inspired air, in expired air what is different in % O2 and % CO2?

% O2 is lower and % CO2 is higher

What is RER used to estimate?

RQ at rest and during low intensity exercise

T or F? RER is the ratio of VCO2/VO2?

What can be determined directly from an RER value?

number of calories being burned per L of O2 consumed

What does an increase in someone’s RER indicate?

a shift towards carbs as a fuel substrate

T or F? At Vo2max, there is a substantial contribution of anaerobic glycolysis.

T

T or F? At Vo₂max, most ATP is being supplied through aerobic metabolism.

T

A person’s VO2 max tell us something about what factors?

physiological function, health risk, functional abilities, aerobic fitness

What factors influence VO2 max?

mode of exercise, body composition, sex, genetics

When is mode of exercise an important consideration?

when repeatedly testing the same individual

What is body composition influenced by?

sex and training

What is sex largely explained by?

differences in testosterone levels

What are genetics (factor impact wise)?

most important factor

VO2 max T or F? VO2max will improve a similar amount with resistance compared to endurance training.

F

VO2 max T or F? Most people can increase their VO2max at least 20% with training.

F

Approximately what proportion of inter-individual variability in Vo₂max can be accounted for by genetics/heredity?

70%

Vo2max tends to be approximately ____________ higher in males compared to females.

20%

What occurs to VO2 max?

decreases with age, higher in males than females, increases with body size, lower in people with higher % body fat (other factors constant)

What is important when thinking about endurance performance?

VO2 max, threshold, efficiency

For endurance performance, why is VO2 max important?

it sets the absolute ceiling for aerobic metabolic rate, It is not possible for the person to reach higher metabolic rates for more than a minute or two.

For endurance performance, why is threshold important?

it tells us what proportion of above factor that can be sustained throughout a race

For endurance performance, why is efficiency important?

it determines what they can actually DO at their maximum sustainable metabolic rate - how fast can they run/bike/swim or whatever is required for the race

Who has the higher threshold?

Person A has a Vo2max of 50 mL/kg/min and their threshold is at 70%.

Person B has a a Vo2max of 40 mL/kg/min and their threshold is at 80%.

Person A