Athletic heart syndrome in dogs competing in a long-distance sled race.

@article{Constable1994AthleticHS,
  title={Athletic heart syndrome in dogs competing in a long-distance sled race.},
  author={Peter D Constable and K W Hinchcliff and Jean L. Olson and Robert Louis Hamlin},
  journal={Journal of applied physiology},
  year={1994},
  volume={76 1},
  pages={433-8}
}
The cardiac effects of endurance training were evaluated by cardiac auscultation and electrocardiographic examination of 48 heavily trained sled dogs (3,000-5,000 km of training), 18 lightly trained sled dogs (300-800 km of training), 19 untrained sled dogs, and 14 mongrel dogs. A grade I-II/VI early- to midsystolic cardiac murmur was auscultated with increasing frequency as training level increased. The QRS duration (66.1 +/- 7.4 ms) and QT interval (236 +/- 20 ms) were significantly (P < 0.05… CONTINUE READING

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