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That’s interesting. There must be an element of heat rate lag too ie it’s drifting up slowly on the start of the downhill as a result of the effort on the previous uphill? Presumably adrenaline would also push HR up a bit?
Is there an element of needing to train high cadence for downhill work? I know the bmx team used to work on super high cadence including bikes with no chain, rollers and watt bikes on low resistance, aiming to be able to instantly switch on the power they had as soon as there was a spot to get in a pedal. That’s definitely something you can train away from trails.
Sorry to bang on but this is why training for MTB is so far outside my experience - here's the section I linked to above, average power of 57 watts but an average HR of 162.
I'm making an effort - but it's (almost) all about moving the bike around rather than pedalling it.
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