Definition: The term introduced by W.R. Hess to denote those mechanisms and the functional status of the nervous system that favor the organism's capacity to expend energy, as distinguished from the trophotropic mechanisms promoting rest and reconstitution of energy stores. In general, the balance between ergotropic and trophotropic nervous mechanisms corresponds in large part to that between the sympathetic and parasympathetic subdivisions of the autonomic nervous system.
[ergo- + G. tropos, a turning]
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Examples: glitazone, GI cocktail, etc.