Body Surface Potential Mapping during Ventricular Depolarization in Athletes with Prolonged PQ Interval after Exercise.

Background: Prolongation of the PQ interval, generally associated with an atrioventricular conduction delay, may be related to changes in intraventricular impulse spreading.

Objective: To assess, using body surface potential mapping (BSPM), the process of ventricular depolarization in athletes with prolonged PQ intervals at rest and after exercise.

Methods: The study included 7 cross-country skiers with a PQ interval of more than 200 ms (Prolonged-PQ group) and 7 with a PQ interval of less than 200 ms (Normal-PQ group).

Body Surface Potential Mapping during Ventricular Depolarization in Rats after Acute Exhaustive Exercise.

Background: Exhaustive physical exercise can cause substantial changes in the electrical properties of the myocardium.

Objective: To evaluate, using body surface potential mapping, the electrical activity of the heart in rats during ventricular depolarization after acute exhaustive exercise.

Methods: Twelve-week-old male rats were submitted to acute treadmill exercise at 36 m/min until exhaustion.