Mandy is 23 years old and just graduated with a degree in education. She wants to spend the summer getting in shape for her new job as a teacher starting in the fall. What will Mandy's predicted HRmax be as she begins to exercise regularly? Question 19 options: A) 197 beats per minute B) 190 beats per minute C) 176 beats per minute D) 185 beats per minute
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Medical researchers have determined that for exercise to be beneficial, a person's desirable heart rate, R, in beats per minute, can be approximated by the formulas: for women: R = 206 - (0.88 * a) for men: R = 220 - a where a represents the person's age. If the desirable heart rate for a man is 135 beats per minute, how old is he? a. 22.5 years old b. 40 years old c. 45 years old d. 42.5 years old Please select the best answer from the choices provided.
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Concern the maximum heart rate (MHR). which is the maximum number of times a person's heart can safely beat in one minute. If MHR is in beats per minute and $a$ is age in years, the formulas used to estimate MHR, are $$For females: \mathrm{MHR}=226-a$$ $$For males: MHR $=220-a$$ Recently $^{21}$ it has been suggested that a more accurate predictor of MHR for both males and females is given by $$ \mathrm{MHR}=208-0.7 a $$ (a) At what age do the old and new formulas give the same MHR for females? For males? (b) Which of the following is true? (i) The new formula predicts a higher MHR for young people and a lower MHR for older people than the old formula. (ii) The new formula predicts a lower MHR for young people and a higher MHR for older people than the old formula. (c) When testing for heart disease, doctors ask patients to walk on a treadmill while the speed and incline are gradually increased until their heart rates reach 85 percent of the MHR. For a 65 -year-old male, what is the difference in beats per minute between the heart rate reached if the old formula is used and the heart rate reached if the new formula is used?
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