MHR Test Results... strange stuff happened

[Ssushi]

I tried to test my max HR today, I aniled it until I flat lined at 173, this seemed low as I'm 31 but as I eased off I my HR jumped 17 BBM to 189.

Anyone have the same experience or an explaination?

Which should I use to calc. my training zones?
Cheers
Ssushi

 

[Ssushi]

Results attached....

 

[2LAP]

Reply, looks like there was an error with your HRM as the plataux is 'unphysiological' in shape.

As the rest of the curve looks OK, I'd go with the higher value of 189 for the time being and repeat the test in a week!

 

[maarten]

Looks like your hrm blocked. didn't get a signal and kept with the last reading 173 and then made contact again and gave the proper reading 189 at that time.