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Avaliou-se o perfil eletrocardiográfico de 60 eqüinos da raça Mangalarga Marchador, clinicamente sadios, com idades variando de um a 28 anos, sendo 39 fêmeas e 21 machos. A freqüência cardíaca tendeu a diminuir com a idade e a amplitude da onda P aumentou ao longo do crescimento do animal. Os parâmetros de duração de QRS e amplitude de S foram maiores em machos que em fêmeas.<br>For the electrocardiographic evaluation of Mangalarga Marchador breed horses, 60 electrocardiograms were recorded from clinically healthy equines aging from one to 28-year-old, being 39 females and 21 males. The heart rate tended to decrease with age and the amplitude of P wave increased with the growth of the animals. The duration of the QRS complex and the amplitude of S wave were greater in males than in females.