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Table 2 Prevalence of training related ECG changes in the male and female marathon runners

From: Prevalence of abnormal and borderline electrocardiogram changes in 13, 079 Chinese amateur marathon runners

  Men
(n = 9897)
Women (n = 3182) Total
(n = 13,079)
P*
n % n % n %
Sinus bradycardia 1544 15.60% 375 11.79% 1919 14.67% < 0.01
Sinus arrhythmia 790 7.98% 268 8.42% 1058 8.09% > 0.05
Left ventricular high voltage 400 4.04% 8 0.25% 408 3.12% < 0.01
Right ventricular high voltage 9 0.09% 0 0.00% 9 0.07% > 0.05
Early Repolarization/ ST segment elevation 130 1.31% 33 1.04% 163 1.25% > 0.05
1° AVB 39 0.39% 4 0.13% 43 0.33% < 0.01
Mobitz type 1 (Wenckebach) 2° AVB 1 0.01% 0.00% 1 0.01%  
Ectopic atrial or junctional rhythm 5 0.05% 1 0.03% 6 0.05% > 0.05
Incomplete RBBB 118 1.19% 9 0.28% 127 0.97% < 0.01
Any of the above findings 2071 20.93% 546 17.16% 20.01% < 0.01
  1. Some participants had to have more than one ECG abnormality
  2. Note: *: p value of chi-square test between men and women
  3. AVB atrioventricular block, RBBB right bundle branch block