The catecholamines—primarily epinephrine, but also norepinephrine and dopamine—are secreted by the adrenal medulla and are important for the acute expression of strength and power because the hormones act as central motor stimulators and peripheral vascular dilators to enhance enzyme systems and calcium release in muscle.
This excerpt explains the importance of optimal nutritional strategies in conjunction with good sleep hygiene and how that can help mitigate damaging effects of deployment and shift work on performance.