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5.3a Analyse and evaluate the effect of exercise on the ECG trace The heart is a hollow, muscular organ which through a muscle contraction generates the force to circulate blood throughout the body. Heart contractions result from a series of electrical potential changes, this is known as depolarization waves. The depolarization waves travel through the heart just before to each beat. (Seeley 2000) Two systems control the effects of the contraction on the heart. 1. The first is the autonomic nervous system, which is situated through the vagus nerve. This nervous system controls the accelerations and decelerations of heart rate. 2. The second system is the intrinsic conduction system which ensures that heart muscle tissue depolarizes in order, e.g. from atria to ventricles, which therefore results in a coordinated heart beat. The intrinsic conduction system is composed of several important components, * The SA (sinoatrial) node, * The AV (atrioventricular) node, * The...

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