W4-L2: Ventilatory Threshold

Question 1

Ventilatory Threshold (Tvent)
Theory

Answer 1

greter CO2 as bicarbonate buffers

Question 2

What is Lactate threshold (LT)?

Answer 2

highest O2 consumption or exercise intensity achieved with less than 1.0 mM increase in blood concentraiton above the pre-exercise level

Question 3

What is Onset of Blood Lactate Accumulation? (OBLA)

Answer 3

blood lactate concentration systemically increases to 4.0 mM

Question 4

Appearance of lactate threshold Results from what 4 factors?

Answer 4

1. Imbalance between the rate of glycolysis and mitochondrial respiration
2. Decreased redox potential (increased NADH relative to NAD+)
3. Lower blood O2 content
4. Lower blood flow to skeletal muscle

Question 5

Answer 5

Zone 1 - training below lactate and ventilatory threshold, clearance of lactate greater than production. Ventilates matches O2 cocumption and CO2 production. moderate easy to maintain

Zone 2 - In the middle VT 1 & VT2. Harder to maintain. blood lactate increases, so clearance increases

Zone 3 - bw LT2, VT2 and VO2max, only maintain for a short amount of time

Question 6

Does Ventilation Limit Aerobic Endurance?

Answer 6

• Little to no adaptation in pulmonary structure and function occurs in aerobic training versus cardiovascular and neuromuscular function
• Pulmonary function does not form a “weak link” in the O2 transport system