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To the Editor:—
Relative to the significant communication on sinus bradycardia by Dr. Paul D. White (The Journal, Oct. 24, 1942, p. 642) it may be of interest to report briefly my experiences in the examinations of approximately 36,000 men aged 18 to 45 at this station.Sinus bradycardia below 50 was observed in relatively few instances. A rate of 44 was the lowest noted, occurring in 2 men; 1 was an athlete (professional boxer), the other was not. The majority of the examinees exhibiting sinus bradycardia below 50 were either athletes or men engaged in strenuous activity. Many well known athletes examined at this station, including Al Hostak, former World's middleweight boxing champion, George Athans, Olympic diver from Canada, and college football players, revealed no sinus bradycardia. The absence of sinus bradycardia under 40 in 36,000 consecutive men would seem to indicate that sinus bradycardia of such pronounced degree
Wilburne M. SINUS BRADYCARDIA. JAMA. 1943;121(9):700. doi:10.1001/jama.1943.02840090070030
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