pan y agua
Join Date: Aug 2005
Bikes: Wilier Zero 7; Merlin Extralight; Co-Motion Robusta; Schwinn Paramount; Motobecane Phantom Cross; Cervelo P2; Motebecane Ti Fly 29er; Calfee Dragonfly Tandem
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I think the powertap is a good tool, and it does help but it's not a panacea. Read Allen and Coggan's book training with power, and you'll get a good idea of what it can do for you. One of the big differneces I've seen with the Powertap, as oppossed to HR is that the intervals tend to be a more sustained hard effort.
For example doing steady states by HR, you inevitably have to ease up at times to keep your HR in the zone. However, going off power, you have to maintain the power for the prescribed time. With less confounders, such as heat and dehydration, power is a more useful measure.
And if you train with a coach, the ability to share the data with the coach is very helpful.