(c) The doctor divided her coronary heart disease patients randomly into two equal groups.
Each group was given different instructions:
•
group A
.
patients were given a daily exercise plan
group B-patients were told to make their own exercise plan.
The doctor measured the heart rate (HR) of each patient immediately after doing exercise
and again one minute later.
She calculated their heart rate recovery using this formula:
heart rate recovery = HR immediately after exercise - HR one minute after exercise.
She then calculated the average heart rate recovery for each of the two groups of patients.
The doctor repeated these measurements after three months and after six months.
The results are shown in Fig. 2.1.
30-
Key:
high
group A
fitness
group B
medium
average
heart rate recovery
15-
/beats per minute
25-
2018
fitness
10-
low
5-
fitness
0+
0
3
6