What HRM are you using? If it was optical/wrist based then there's a chance it was just under-reading the entire time.
If you were pushing it then there's no way your HR was ~40bpm down on normal.
Yes - wrist based. Are they that shit? It seems fairly accurate on longer runs ie it hits my max HR.
@Greenbank started
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What HRM are you using? If it was optical/wrist based then there's a chance it was just under-reading the entire time.
If you were pushing it then there's no way your HR was ~40bpm down on normal.