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Experimental protocol of hypoxic trails (placebo and beetroot) in this study. Norm, normoxia; EX, exercise; HR, heart rate; bpm, beats per minute. Gray squares indicate the values at baseline, the last 5 min during submaximal exercise, and the last 30 sec at each work rate during maximal exercise. Data for the last 5 min and last 30 sec were used to calculate relative changes from the baseline values in near infrared spectroscopy signals (see Data analysis in the text).
