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 – Dubin’s 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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- Fall '06
- heart rate, Cardiac electrophysiology, electrical impulse, cardiac muscle fibers, Elisa Giordano KIN