Measuring my max heart rate

TheDrunkMonk
TheDrunkMonk Posts: 181
I've bought this book about training for sportives, and its all based on heart rate zones, fair enough.

It says to measure your maximum heart rate on a turbo trainer slowly cranking up the effort over 15 minutes until you can crank up no more.

If I don't want to setup my turbo trainer, would it be a safe enough assumption that the maximum heart rate I acheived go up a bloody steep climb midway through a sportive would end up the same as this trubo trainer practice?

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