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Arm blood flow is possibly influenced also by sympathetically mediated vasoconstriction, as indicated by increased norepinephrine spillover over the arms when leg exercise is added. Catecholamines and noradrenaline spillover at rest and during arm (A) and combined arm and leg (A + L) exercise. Values are means ± SE; n = 10. *P < 0.05, different from rest; +P < 0.05, different from A. (Reproduced from Ref. 212 with permission.)
