Recent studies have shown a decrease in the amplitude of intracardiac electrograms during exercise in patients with permanent pacemakers.1-3 However, the mechanism by which exercise decreases the amplitude of the intracardiac electrograms has not been investigated. Because exercise is associated with both an increase in heart rate and an increase in circulating catecholamines,4,5 the purpose of this study was to determine how these factors influence the amplitude of the atrial and ventricular electrograms.
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http://deepblue.lib.umich.edu/bitstream/2027.42/28488/1/0000282.pdf