Originally Posted by
cyclinfool
AJ,
You are probably at a much higher fitness level than I. I see my HR move fairly quickly, not immediate - several second of lag but not minutes. I would not expect to hit above LT immediately but after 60 seconds of effort I would expect to see HR there or close - at least for me. Throughout the season I usually use PE but have switch backed to the HRM so as not to fool myself. PE is a good indicator but there is definitely a mood component, us engineers like gauges not guesses
Power meter or stopwatch. Time over a fixed distance traveled is power. HR is very inaccurate for those type of efforts.