S1L4 Maximum O2 uptake (VO2max)

Question 1

What systems contribute at different stages of exercise?

Answer 1

• first 10 secs = ATP/PCr system
• up to 2 mins = glycolysis system
• above 2 mins = aerobic system
• shorter event = larger anaerobic contribution

Question 2

What is Fick’s equation and how can its components be increased?

Answer 2

VO2 = HR X SV x (a-v)difference
* increase VO2 by increaseing Q and a-v
* increase Q by increasing SV
* increasing a-v by increeasing capillary number and recruitment etc

Question 3

What does VO2 max depend on?

Answer 3

• Good CV system and high Q
• well developed oxidative capacity in skeletal muscle
• so, central CV system = a limting factor

Question 4

what is absolute and relative VO2max?

Answer 4

absolute = total volume of O2 uptake during exercise
relative = total volume of O2 uptake relative to body weight

Question 5

How is relative VO2 max calculated?

Answer 5

(absolute VO2 / Body weight) x 1000

Question 6

What are other determinants of endurance performance?

Answer 6

• ability to sustain high % of VO2 max for prolonged periods
• ability to produce high power / speed at a given O2 uptake

Question 7

What is the test for VO2max?

Answer 7

test to exhaustion - achieved in 8-12 mins
* if protocals too short - exhaustion due to peripheral limitations
* if protocals too ling - exhaustion due to duration

Question 8

what is the primary criteria for VO2max?

Answer 8

• a plataeu in VO2 despite increase in load / speed at next stage (< 2ml/kg/min)

Question 9

What are the secondary criteria for VO2max?

Answer 9

• HR within 90% of MHR
• Blood lactate > 8mmol/L
• RER > or = to 1.15
• RPE > or = to 19