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reciprocal beat a heartbeat resulting from an atrial or ventricular complex caused by a return of an impulse to its chamber of origin; called also echo beat. sinus beat a heartbeat with sinus rhythm. ventricular beat an ectopic beat originating in a ventricle.
A back beat, or backbeat, is a syncopated accentuation on the off beat. In a simple 4/4 rhythm these are beats 2 and 4. A big part of R&B's attraction had to do with the stompin' backbeats that make it so eminently danceable, according to the Encyclopedia of Percussion.