Join Date: May 2005
Location: North Bend, WA
Bikes: Cervelo Soloist / Cervelo P3
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If the person next to you has the same model HRM and they are close enough, then it may be a problem for as long as they are that close; it probably depends on the HRM. Otherwise this isn't something to worry about.
If you wear one for a while you may develop a good sense of how pace, terrain, and how you feel correlates with heart rate; I can now usually predict mine +/-3 beats. An anomolous reading then often indicates dehydration, illness, or picking up somebody else's transmitter.