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Thread: Cardio#3

  1. #1
    IMG SURVIVOR's Avatar
    IMG SURVIVOR is offline Moderator 536 points
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    Cardio#3

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    An exercise prescription to walk briskly 2 miles per day 5 days per week is given to the following patients: a healthy 20-year-old woman; a 50-year-old man who takes β-blockers for hypertension; and a healthy 70-year-old woman.
    Which of the following statements about this prescription in these patients is true?
    A. The absolute intensity of exercise is nearly the same in these patients.
    B. The exercise dose differs among the patients because of the differences in their ages.
    C. This exercise prescription lacks sufficient information about modality and frequency.
    D. This exercise prescription is inadequate to provide significant health benefits.
    E. A walking program is unlikely to provide benefit in the 20-year-old woman.

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    why even bother with the obvious. Just know where you are need it and where you can help the most.

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    Bubbamier is offline Newbie 510 points
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    B. Because exercise prescription usually depends on the max heart rate. The max heart rate is usually calculated with the age HRmax = 220 - age. So the patient should be advised, to exercise and to maintain the HR to a value lower than their max HR.
    -------------------
    Dr. Mier
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    Educational Objectives
    Understand the components of an exercise prescription.
    critique
    The recommendations provided to these three persons include information on all of the key components of an exercise prescription: intensity, frequency, and modality. Here, intensity is prescribed as absolute intensity, such as brisk walking, and not as relative intensity, such as percentage of maximum heart rate or oxygen uptake. The relative intensity will vary because each individual will exercise at a different percentage of his or her peak capacity or heart rate. The frequency is 5 days per week. Although an exact time to complete the task is not given, the duration of exercise is implied by the recommendation to walk 2 miles at a brisk pace. The time needed to complete the 2-mile walk may vary, but if each person walks briskly, individual times should not differ significantly. The exercise modality is walking. The exercise dose (the approximate amount of energy expended per unit time) is similar among all participants because they are performing the same amount of exercise weekly. Age affects the relative intensity of exercise, but does not substantially affect the amount of energy expended because the pace and duration will be nearly the same in all participants. Brisk walking (3 to 4 miles per hour) is usually considered a moderately intense exercise. When performed 5 days per week, persons of all age groups should achieve health benefits.
    Moderator: USMLE AND Residency Forums.

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    why even bother with the obvious. Just know where you are need it and where you can help the most.

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