Which of the following statements about physical activity and heart attacks is false? Ninety percent of heart attacks are associated with physical activity; 10 percent are not. The risk for those who engage in habitual vigorous activity increases only slightly during exercise. Inactive people are 50 times more likely to have a heart attack during exertion than when they are not exercising. In order for inactive people to lower the risk of a heart attack during exercise, it is important they start a program slowly.
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Madhur L.
All of the following were critical updates to the 1995 physical activity recommendations EXCEPT a. Vigorous-intensity exercise is not recommended b. Muscular strength activities were added c. Moderate- and vigorous activity can be combined to meet recommendations d. Clarification of a short bout to 10 minutes An indicator used to measure activity level and energy expenditure during physical activity is called _________. a. MET b. ACSM c. RMR d. CDC Stroke volume is equal to the difference between left ventricular end diastolic volume and left ventricular end systolic volume. Frequency of exercise is an important component to the FITT Principle for all of the following reasons EXCEPT a. Provides a consistent stress to the body b. Overall health benefits c. Allows for adequate recovery between bouts d. Overall aerobic capacity benefits To calculate target heart rate using the Karvonen Method the lower limit % HR is ____and upper limit % HR max is____. a. 50%, 85% b. 55%, 85% c. 50%, 70% d. 55%, 70% During ventricular filling, deoxygenated blood flows into the right atria and ventricle all while the _______ valves are open and the ______ valves are closed.
Adi S.
45. Myocardial efficiency will be improved if stroke volume is decreased and/or heart rate is increased for a given workload. 46. When going from moderate levels of exercise (e.g., 30-50% of maximal effort) intensity up to maximal levels of exercise intensity, the observed increase in cardiac output is due to an increase in heart rate. 47. Because hemoglobin is an allosteric protein, the binding of oxygen to hemoglobin and the unloading of oxygen from hemoglobin is cooperative (i.e., the binding of oxygen to one heme enhances the binding of oxygen to other hemes and vice-versa, the unloading of oxygen from one heme enhances the unloading of oxygen from other hemes) resulting in a 2-fold increase in the availability of oxygen to muscle tissue; in addition, shifting of the hemoglobin-oxygen dissociation (Hb-O2) curve to the right does not affect the amount of oxygen loaded on hemoglobin in the lungs but increases the amount of oxygen released from hemoglobin to the muscle tissue and hence, oxygen availability to the muscle tissue is increased. 48. During exercise at sea level, there is usually not enough time for the complete diffusion of oxygen and carbon dioxide between the lungs and the blood as well as between the blood and the muscle tissue. 49. The partial pressure of oxygen (PO2) in the blood has minimal effects on cardiorespiratory responses or oxygen availability to the muscle tissue. 50. Elevations in altitude above 1,500 meters decrease maximal oxygen uptake rate (VO2max) and consequently hinder endurance performance. 51. Whereas volume of training refers to the percent of a one-repetition maximum that is lifted in strength training or the percent of maximal heart rate in endurance training, intensity of training refers to the number of repetitions per set times the number of sets completed in strength training or the duration or distance in endurance training. 52. According to the Surgeon General's Report, every American should accumulate 20 minutes of vigorous activity most if not all days of the week. 53. According to the American College of Sports Medicine's Position Stand on the recommended quantity and quality of exercise for developing and maintaining cardiorespiratory fitness, individuals should train 3-5 days per week at 60-90% of heart rate maximum for 20-60 minutes per session.
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