Why is a high resting BP considered a risk for exercise testing? Based on your knowledge of BP responses to exercise, what effect would high resting BP have on the myocardium when a person reaches heavy and maximal levels of exercise? (Refer to RPP in your response)
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Why is a high resting BP considered a risk for exercise testing? Based on your knowledge of BP responses to exercise, what effect would high resting BP have on the myocardium when a person reaches heavy and maximal levels of exercise? (Refer to RPP in your response)
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- Other than heart rate what are two other variables that increase with exercise and why do they increase? Possibly variables include systolic BP, Diastolic BP, MAP, R-T interval, etc.Is cardiovascular exercise as beneficial for developing muscular hypertrophy as resistance training? Why or why not?Describe how cardiac performance is measured in cardiac output. In your answer, be sure to describe the role of stroke volume (SV) and HR by defining each and discussing factors that influence SV in particular both during acute exercise and following chronic exercise training.
- Caffeine lowers the heart rate by increasing rates of depolarization at the SA node True False Nicotine raises the heart rate because it stimulates the activity of the sympathetic neurons in medulla oblongata True False The Frank-Starling Law of the Heart states that the force of heart contraction is directly proportional to the initial length of the muscle fiber, within optimal limits of length True False If the sarcomeres stretched beyond the optimal length, the force of contraction would go down, but that can potentially happen only during open heart surgery when the heart is not constrained by the pericardium, lungs, ribs and diaphragm. True False It is the Na+ channel-driven spontaneous depolarization that is affected by sympathetic and parasympathetic inputs to speed up or slow down the firing rate of the SA node and other conductive cells. True FalseExplain the protocol for administering a clinical exercise test. What are the normal heart rate and blood pressure responses to exercise? What is the diagnostic value of exercise testing for ischemic heart disease?A 43-year-old woman has congestive heart failure after a myocardial infarction. Before the myocardial infarction, she had a cardiac output of 5 L/min and a right atrial pressure of 0 mm Hg at rest. The solid curve in the graph shows the relationship between right atrial pressure and cardiac output in a normal heart. Which of the following lettered points best represents the change in this relationship after the development of congestive heart failure?
- Why is exercise heart rate crucial during cardiovascular exercise and how does this affect treatment?A Zumba instructor remembers the data given in the following table, which shows the recommended maximum exercise heart rates for individuals of the given ages. Age (x years) 20 40 60Maximum heart rate 170 153 136(y beats per minute) d. Use the equation from part c to predict the maximum exercise heart rate for a person who is 72.e. Is the procedure in part d an example of interpolation or extrapolation?Blood doping (using injected substances to artificially enhance performance) is illegal in many sports. Two substances used are erythropoietin and hypoxia-inducible factors (HIF). One of the actions of HIF is to increase formation of new blood vessels (angiogenesis). Explain how administering erythropoietin can increase performance and how HIF can increase performance through angiogenesis.
- After being rescued from the pool by the lifeguards, Marco now makes his way to the powerlifting competition, where he must deadlift (lift off the floor) 500kg. Consider how the following parameters would change during this bout of static exercise. Assume Marco can't actually lift the weight, but is trying really hard to do so. Cardiac output MAP AV conduction time [Choose ] [Choose ] [Choose ]Why is the rate of cardiac muscle relaxation faster when a positive inotropic agent is present?Explain the term “Exercise is cardio-protective”?