During maximal exercise, heart rates were similar in both tests as the metabolic demands of exercise became more significant in setting heart rate.
(heart rates; were; similar in both tests; T:as the metabolic demands of exercise became more significant in setting heart rate; T:During maximal exercise) (the metabolic demands of exercise; became; more significant in setting heart rate)
heart rates the metabolic demands of exercise
were became
similar in both tests T:as the metabolic demands of exercise became more significant in setting heart rate T:During maximal exercise
more significant in setting heart rate