Subject: RE: HR Zones: 220-Age - the TRUTH!I have seen this as well. The best answer I can really give you, unfortunately, is 'it depends'.
It depends on your sweat rate, how well you do in the heat, the humidity, how well you are hydrated and so on.
The best advice I can give you is to 'know' your variations in different temps. Maybe in mid 60s your HR only is 10 bpm off, but in the mid 70s it's 20 bpms off. If you 'know' your HRs at certain temps, you should have an idea of what numbers you will see and you can correlate this to RPE - rate of perceived exertion.
I know this doesn't help much, but it's such a hard question to answer.
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