Jim’s heart rate was monitored during periods of exercise and periods of rest. The graph shows the result of one 50-minute test.Which statement is an inference that can be made by using the graph?
Answer
A
Jim’s heart rate was 60 beats per minute at the start of the test.
B
Jim’s maximum heart rate during the test was 140 beats per minute.
C
Jim’s heart rate increased steadily as he continued exercising.
D
Jim’s heart rate decreased quickly after 30 minutes since he is in good shape.