It's a physiological response to heavy mental exertion similar to what researchers have found with hockey goaltenders. While forwards and defense peaked around 150 during shifts, their heart rate dropped dramatically when on the bench, while goaltenders heart rates stayed consistently high (120ish) when the puck was in the offensive end and increasing to 150ish when the puck was active in the defensive end.
LSU researchers (and others) have confirmed the impact of mental activity on heart rate (and other physiological responses).
Your competition should feel at ease knowing your head was in the game (race)

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