K+ channel blockers like 3. 4-diaminopyridine (DAP) can double isometric muscle force. Functional movements require more complex concentric and eccentric contractions. however the effects of K+ channel blockade on these types of contractions in situ are unknown. https://www.roneverhart.com/Neumann-KK-205-Supercardioid-Capsule-Head-Black-008654-p29875/