Originally Posted by
Bearhawker
Not quite clear on what a "threshold heart rate" is - presuming its a rate you can maintain for a period of time?
"Threshold heart rate" is your heart rate at lactate threshold. It's usually defined as the highest heart rate you can sustain for up to 1 hour.
Coggan describes how lactate threshold feels:
Essentially continuous sensation of moderate or even greater leg effort/fatigue. Continuous conversation difficult at best, due to depth/frequency of breathing. Effort sufficiently high that sustained exercise at this level is mentally very taxing.