Question

Answer the following parts

Walking and running study related to heart rate: A researcher wants to know which exercise program: 1) a fast walking program, or 2) a running program is most effective in reducing the risk of a myocardial infarction. The researcher anticipates that the target heart rate for the program is an important additional variable that needs to be considered. The researcher will recruit 100 volunteers from a local exercise facility in a large retirement community. Subjects must be between 70 to 80 years old, willing to follow the assigned program three days a week for up to ten years, and with no serious heart disease or other problems that would limit participation in the exercise programs. Subjects will be randomly assigned to one of four groups: 1) fast walking for 30 minutes at a pace and at an incline adequate to keep the heart rate in the range of 55-65% of the age-adjusted maximum heart rate, 2) fast walking for 30 minutes at a pace and at an incline adequate to keep the heart rate in the range of 70-80% of the age-adjusted maximum heart rate, 3) running for 30 minutes at a pace and at an incline adequate to keep the heart rate in the range of 55-65% of the age-adjusted maximum heart rate, 4) running for 30 minutes at a pace and at an incline adequate to keep the heart rate in the range of 70-80% of the age-adjusted maximum heart rate. Subjects will be followed for 10 years and the number of MIs will be compared among the four groups.

Part 1) In the walking and running study related to heart rate, which is the dependent variable? (multiple answers allowed)

a) both exercise program and percentage of the age-adjusted maximum heart rate

b) fast walking program

c) percentage of the age-adjusted maximum heart rate

d) number of MIs

e) running program

Answer 1

• (a) Both exercise programme and percentage of the age adjusted maximum heart rate.
• By the help of exercise programme i.e fast walking and running programme the effect on reducing risk of myocardial infraction was compared.
• Heart rate is an important variable. So exercise programme and percentage of the age adjusted maximum heart rate are dependent variables.