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 06-09-04, 08:18 PM #1 cnudell Member Thread Starter   Join Date: Jun 2004 Bikes: Posts: 34 Mentioned: 0 Post(s) Tagged: 0 Thread(s) Quoted: 0 Post(s) HR Zones calculation methods I have a few questions regarding the 2x20 and other methodologies: The 2x20 method generates a linear line. Is “effort” really linear? Other methods suggest none liners graphs (or is it really related to Exertion). The non-linear line is taking into account a Factor increases with effort. Other methodologies do not use same percentages range for Zones. For example, a recovery Zone is much larger than the Aerobic or Lactate Threshold. Are the Zones really generic or individuals may have various Zones. Like the MHR, the Zone ranges can vary. How can I make the transition/translation between these methods?
06-10-04, 06:37 AM   #2
BikeInMN
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 Originally Posted by cnudell I have a few questions regarding the 2x20 and other methodologies: The 2x20 method generates a linear line. Is “effort” really linear? Other methods suggest none liners graphs (or is it really related to Exertion). The non-linear line is taking into account a Factor increases with effort. Other methodologies do not use same percentages range for Zones. For example, a recovery Zone is much larger than the Aerobic or Lactate Threshold. Are the Zones really generic or individuals may have various Zones. Like the MHR, the Zone ranges can vary. How can I make the transition/translation between these methods?
I'll use this chance to pass along my favorite HRZone Calculator LINK which helps you establish your zones based on max HR or what you think your max HR is.

I do 2x20s regularly in the early season and while the power (measured in watts) generated is linear, the perceived effort is not. I'm quite comfortable for the first 14-15 minutes of the interval while the remaining 5+ minutes are done at a higher perceived effort. My HR is also not constant in that it will sometimes take close to 5 minutes to reach my TT HR before it levels off.