If you are keen for your baby to be introduced to swimming before he is six weeks old your partner, or someone else, can take him. Some private baby swim classes start as early as four weeks but most classes at public pools begin at around 4 months.
Electrocardiogram (EKG, ECG) General Description. As the heart undergoes depolarization and repolarization, the electrical currents that are generated spread not only within the heart, but also throughout the body. This electrical activity generated by the heart can be measured by an array of electrodes placed on the body surface.
Making the world better, one answer at a time. The TP interval reflects the period between ventricular repolarization (recovery) and atrial depolarization (excitation). This shortens during exercise because in order to meet increased skeletal muscle demand, the heart rate increases.ost of this shortening occurs in the TP interval. The QT i â¦ nterval also shortens, but only slightly. then the interval shortens as the heart rate increases.