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Edit for Hysterical Strength
Hysterical strength is a display of extreme strength by humans, beyond what is believed to be normal, usually occurring when people are in life-and-death situations. Common anecdotal examples include parents lifting vehicles to rescue their children. The extra strength is commonly attributed to increased adrenaline production, though supporting evidence is scarce, and inconclusive when available. Research into the phenomenon is difficult, though it may be possible as adrenaline is known to affect muscle twitch and endurance.

Unexpected strength is claimed to occur during excited delirium.

Early experiments showed that adrenaline increases twitch, but not tetanic force and rate of force development in muscles. It is questionable whether adrenaline, released from the adrenal medulla into the venous circulation, can reach the muscle quickly enough in order to be able to cause such an effect in the midst of a crisis. It may be that norepinephrine released from sympathetic nerve terminals directly innervating skeletal muscle has more of an effect over the timescale of seconds.