Lecture 9

Question 1

At cooler temperatures, how are the following affected:
-HR
-VO2 max
-Power output
-Stroke volume

Answer 1

-HR: Decreases
-VO2 max: Increases
-Power output: Increases
-Stroke volume: Increases

Question 2

Does O2 consumption per kg of lean mass vary among different people?

Answer 2

No, O2 consumed/kg of lean mass is constant

Question 3

True or False: Trained athletes have greater O2 offloading at the capillaries

Answer 3

True!

Question 4

For weight-bearing/vertical activities, do you use ml/kg/min or L/min regarding VO2? Why?

Answer 4

You use ml/kg/min, as there is lots of time spent in the air for these activities
-Mass plays a large part

Question 5

What is the VO2 slow component phenomenon?

Answer 5

Past the lactate threshold, even if work rate remains constant, O2 consumption gradually increases
-Due to increase in recruitment of slo-twitch muscles which use more O2 and more reliance on anaerobic metabolism

Question 6

Kinetic delay of VO2

Answer 6

As exercise intensity (work rate) increases, your body can’t instantly supply the additional amount of oxygen required, so you use anaerobic forms until that requirement is met. This period is the delay

Question 7

How long is the optimal VO2 max test?

Answer 7

10-12 minutes

Question 8

At what age does VO2 max peak?

Answer 8

25-30

Question 9

Total oxygen cost of an activity

Answer 9

BMR + Vertical component + Horizontal component

Question 10

How to find O2 cost of work

Answer 10

(Watts)(10ml) + (3.5ml)(kg)

Question 11

How to find CHO kcal metabolized over the course of exercise

Answer 11

(Litres O2 per min) (5.05kcals) (mins of exercise)

Question 12

Obese individuals mlO2/kg

Answer 12

5.8ml/kg (regular individuals is 3.5ml/kg)