During exercise, your increased heart rate is measured and compared to your resting baseline measurement taken before exercise started.
(exercise; started; ) (your increased heart rate; is measured; T:During exercise) (your increased heart rate; compared; to your resting baseline measurement; T:During exercise) (your resting baseline measurement; taken; T:before exercise started)
exercise your increased heart rate your increased heart rate your resting baseline measurement
started is measured compared taken
T:During exercise
to your resting baseline measurement T:During exercise
T:before exercise started