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@Big_Block
here is the ride data supplied By Bad Science and following PMs, posted as requested by BS to allow for forum discussion
In my view there had been good contact with the sensors before the 'event' with what appears to be consistent readings.
The event does not appear related to a loose chest strap as the elevation does not play a role (as would occur with leaning forward on a long downhill run)
during the 'event' the heart rate does not appear to respond to changes in effort, ie increased speed or minor changes in elevation.
As the distance travelled over the 8 min 26 sec highlighted would also appear to rule out localised EMF spikes.
So good Doctors, over to you for comment.