Lab 4

Question 1

What is VO2MAX?

Answer 1

maximal oxygen uptake (the upper limit of aerobic metabolism)

VO2MAX is the gold standard of cardiorespiratory fitness and is often related to success in endurance sports

Question 2

What is Anaerobic Threshold?

Answer 2

Anaerobic threshold- the exercise intensity at which aerobic metabolism can be maintained at a steady state prior to increased contribution of the anaerobic system

Question 3

What are Two primary ways to measure anaerobic threshold?

Answer 3

1) LACTATE THRESHOLD - using blood lactate “breakpoint”
2) VENTILATORY THRESHOLD - using ventilation and gas exchange (VO2 and VCO2 )

Question 4

What is Lactate Threshold?
(LT1 & LT2)

Answer 4

Lactate Threshold 1 (LT1) = Exercise intensity before blood
lactate begins to accumulate

• lactate clearance > lactate production
  MAJORITY FROM AEROBIC BUT INCREASED ANAEROBIC

Lactate Threshold 2 (LT2) = distinct sudden breakpoint
leading to increase in blood lactate

• lactate clearance < lactate production

Question 5

What is Ventilatory Threshold?

Answer 5

the exercise intensity where there is a disproportionate increase in carbon dioxide production, and oxygen consumption (VO2),
signaling a switch from predominantly aerobic energy production to significant anaerobic metabolism.

• Occurs at similar points to LT

Question 6

What is the V Slope Method?

Answer 6

The graphic relationship between VO2 and VCO2 allows for determination of VT by locating the breakaway point in which the slope of the line changes and forms a new slope.

How to calculate VT using V Slope method

• Plot VCO2 (y axis) and VO2 (x axis)
• Create 2 lines of best fit
• Points where lines intersect = Vent. Threshold
• Determine intensity from threshold (HR, VO2, Workload)

Question 7

Exercise Prescription from GXT / Threshold

Answer 7

Results from GXT can be used to prescribe exercise / training
zones using: 1.) Heart rate, 2.) RPE, 3.) Work Rate (watts)

Question 8

What is the Three Zone Model (LT or VT)?

Answer 8