KIN335 - Lab #2

KIN335 - Lab #2 - 2. Calculating cardiac rate The R-to-R...

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Elisa Giordano KIN 335 Due: February 28, 2007 Lab #2 Resting Electrocardiogram 1. Definitions Electrocardiogram (EKG or ECG) – a machine that displays the normal cycle of the hearts electrical activity. Isoelectric Line – the baseline voltage of the EKG Arrhythmia – a condition in which the heart contraction is irregular. SA Node – the “pacemaker” of the heart. It is the small mass of specialized muscle tissue in the heart which generates impulses to the right and left atria. AV Node – continues the electrical impulse from the atria to the ventricles, the impulse is delayed. Bundle of His – a bundle of cardiac muscle fibers which continues the impulse which regulate the heart beat. Left and/or Right Bundle Branch – these branches carry the signal to the right and left ventricles. Purkinje Fibers – the specialized cardiac fibers which send an electrical impulse to enable the heart to contract. It is signaled by the QRS complex.
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Unformatted text preview: 2. Calculating cardiac rate The R-to-R Method Big Boxes: 3 x 0.2 = 0.6 Small Boxes: 3.5 x 0.04 = 0.14 0.6 + 0.14 = 0.74 60/0.74 = 81.08 bpm Dubins Method Heart Rate is about 70 bpm 3. (See attached page) 4. Pathways that determine/influence heart rate The baroreceptors located in the aortic arch and carotid sinus, as well as stimulation from the cortex in the brain, sends inputs to the cardiovascular center in the medulla. The heart is then activated by the efferent pathways from the medulla by way of the vagus and sympathetic nerves. *Bonus Changes in the appearance of an individuals S-T segment on an EKG can be interpreted as a cardiac abnormality. These abnormalities can include things such as myocardial infarction, ischemia, and coronary artery disease. Resources: McArdle, W; Katch, F; Katch V. Essentials of Exercise Physiology. Baltimore, MD. Lippincott Williams & Wilkins. 2006....
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This note was uploaded on 05/04/2008 for the course KIN 335 taught by Professor Unknown during the Fall '06 term at Rhode Island.

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