The amount of exercise was standardized by heart rate and represented the highest target heart rate that is used clinically for this test.
(The amount of exercise; was standardized; by heart rate) (The amount of exercise; represented; the highest target heart rate that is used clinically for this test) (the highest target heart rate; is used clinically; for this test)
The amount of exercise The amount of exercise the highest target heart rate
was standardized represented is used clinically
by heart rate
the highest target heart rate that is used clinically for this test
for this test