Dictionary.net

• The production of force, especially of muscular or nervous energy.

1920 - A practical medical dictionary.
By Stedman, Thomas Lathrop

• A term used by Brown-Sequard to indicate the capac­ity to call forth an increased activity in any organ; usually employed in adjective form, as dynamogenic action.

1916 - Appleton's medical dictionary
By Smith Ely Jelliffe