Anaerobic threshold in endurance
- 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
anaerobic threshold
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
how is AT measured
AT is identified by disproportionate increase in BLa and/or gas exchange parameters during exericse
- blood lactate (LT)
- ventilatory variables (VT)
lactate threshold (LT)
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
ventilatory threshold (VT)
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
intensity zone 1
