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Mean (± SE) plasma epinephrine and norepinephrine levels for each study group at rest and during selected times during exercise and recovery. Day 1 data represent baseline (no blockade). During day 2 testing, parasympathetic blockade with atropine was administered beginning at 12 min of exercise. See Plasma catecholamine levels for details of significant changes in plasma epinephrine and norepinephrine levels.
