Pulmonary system

Question 1

Anaerobic threshold in endurance

Answer 1

• AT is good predictor of marathon times
• cannot work at VO2 max for more than a few minutes due to H and La build up
• exercise up until AT is mostly aerobic
• “red line” is 85% VO2 max for athletes

Question 2

anaerobic threshold

Answer 2

The point at which the aerobic system is not providing ATP well enough and needs help from the anaerobic system.
- slow > fast glycolysis (increase H and La)
- BLa rise, minute ventilation decrease disproportionate to O2 consumption
- good indicator of endurance times, training intensity

Question 3

how is AT measured

Answer 3

AT is identified by disproportionate increase in BLa and/or gas exchange parameters during exericse
- blood lactate (LT)
- ventilatory variables (VT)

Question 4

lactate threshold (LT)

Answer 4

Point during incremental exercise where BLa is higher than resting levels (LT1) (> 2mmol)
LT2 indicates rapid BLa increase and upper limit of production and clearance of La (>4mmol)
- visual methods, OBLA, MLSS

Question 5

ventilatory threshold (VT)

Answer 5

Point during exercise when ventilation rate is higher than VO2.
VT1: breathing rate increases
VT2: start to be out of breath
- measured vs PO, time, %VO2, VCO2

Question 6

intensity zone 1