Hysterical strength, also known as superhuman 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. Such examples, however, have not been proven and have been dismissed by doctors across the world. The extra strength is commonly attributed to enhanced adrenaline production, tho’ supporting evidence is scarce, and inconclusive when available; research into the phenomenon is difficult, however it is thought that it is theoretically possible. 
Superhuman strength may occur during excited delirium. [Two] [Trio]
The most common anecdotal examples are of parents lifting vehicles to rescue their children, and when people are in life and death situations. Hysterical strength can result in ripped muscles due to higher mechanical stress.
- In 1982, in Lawrenceville, Georgia, Tony Cavallo was repairing a one thousand nine hundred sixty four Chevrolet Impala automobile from underneath. The vehicle was propped up with jacks, but it fell. Cavallo’s mother, Mrs. Angela Cavallo, lifted the car high enough and long enough for two neighbours to substitute the jacks and pull Tony from underneath the car. [Four]
- In 2006, Ivujivik, Quebec resident Lydia Angiyou saved several children by fighting a polar bear until a local hunter shot it. [Five]
- In 2006, in Tucson, Arizona, Tom Boyle observed as a Chevrolet Camaro hit 18-year-old Kyle Holtrust. The car pinned Holtrust, still alive, underneath. Boyle lifted the Camaro off the teenager, while the driver of the car pulled the teenage to safety. [Four]
- In 2009, in Ottawa, Kansas, 1.70 m (Five ft seven in), eighty four kg (185 lb) Nick Harris lifted a Mercury sedan to help a 6-year-old chick pinned underneath. 
- In 2011, in Tampa, Florida, 1.91 m (6 ft three in), one hundred thirty four kg (295 lb) University of South Florida college football player Danous Estenor lifted a 1,600 kg (Three,500 lb) car off of a man who had been caught underneath. The man was a tow truck driver who had been pinned under the rear tire of a one thousand nine hundred ninety Cadillac Seville, which had lurched forward as he worked underneath it. The man suffered only minor injuries. 
- In 2012, in Glen Allen, Virginia, 22-year-old Lauren Kornacki rescued her father, Alec Kornacki, after the jack used to prop up his BMW slipped, pinning him under it. Lauren lifted the car, then performed CPR on her father and saved his life. 
- In 2013, in Oregon, teenage sisters Hanna (age 16) & Haylee (age 14) lifted a tractor to save their father pinned underneath. [Ten]
- In 2015, in St. John’s, Newfoundland, Nick Williams lifted a four-wheel-drive vehicle to save a youthfull boy pinned underneath its tire. 
- In 2015, in Vienna, Virginia, Charlotte Heffelmire was able to momentarily use incredible strength to free her father from a GMC pick-up truck. 
Early experiments displayed that adrenaline increases twitch, but not tetanic force and rate of force development in muscles.  It is questionable, however, as to 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 noradrenaline released from sympathetic nerve terminals directly innervating skeletal muscle,  has more of an effect over the timescale of seconds.
Amphetamine and other stimulants are used by some athletes for their psychological and performance-enhancing effects.   In competitive sports, this form of use is prohibited by anti-doping regulations.  In healthy people at oral therapeutic doses, amphetamine has been shown to increase physical strength,   acceleration,   stamina,  [Eighteen] and stamina,  [Legitimate] while reducing reaction time.  Like methylphenidate and bupropion, amphetamine increases stamina and stamina in humans primarily through reuptake inhibition and release of dopamine in the central jumpy system.  [Eighteen]
- ^ Ransom Riggs (25 March 2011). "Does Hysterical Strength Truly Exist?". mentalfloss.com.
- ^"White Paper Report on Excited Delirium Syndrome"Archived October 11, 2010, at the Wayback Machine., ACEP Excited Delirium Task Force, American College of Emergency Physicians, September Ten, 2009
- ^ Sztajnkrycer, Matt D.; Baez, Amado A. "Cocaine, Excited Delirium and Unexpected Unexpected Death" (PDF) . Retrieved twenty nine November two thousand twelve .
- ^ ab Clark, Josh. "How can adrenaline help you lift a Trio,500-pound car?", eleven December 2007. HowStuffWorks.com. Retrieved thirteen November 2008.
- ^ Jane George (2006-02-17). "Polar bear no match for fearsome mother in Ivujivik". Nunatsiaq News / Nortext Publishing Corporation (Iqaluit) . Retrieved 2009-01-01 .
- ^ Huicochea, Alexis. "Man lifts car off pinned cyclist", Arizona Daily Starlet, twenty eight July 2006. Retrieved twenty one November 2010.
- ^ Associated Press. "Kansas dad somehow lifts car off 6-year-old dame", eighteen December 2009. news.yahoo.com. Retrieved nineteen December 2009.
- ^ Greg Auman (2011-06-24). "USF Bulls offensive lineman Danous Estenor lifts car to free trapped man". St. Petersburg Times (Tampa Bay, FL).
- ^ Newcomb, Alyssa. "Superhero Woman Lifts Car Off Dad – ABC News". ABC News . Retrieved twelve January two thousand sixteen .
- ^"Oregon man pinned under Trio,000-pound tractor saved by teenage daughters". Fox News. Eleven April two thousand thirteen . Retrieved twelve January two thousand sixteen .
- ^"Shea Heights hero finds strength to lift vehicle off injured boy". CBC News. Twenty eight September two thousand fifteen . Retrieved twenty eight September two thousand fifteen .
- ^ McCrum, Kirstie (11 January 2016). "Teenage chick uses ‘superhuman strength’ to lift searing truck off dad and save family". Mirror . Retrieved eleven January two thousand sixteen .
- ^ Hoh, JF; Rossmanith, GH; Kwan, LJ; Hamilton, AM (1988). "Adrenaline increases the rate of cycling of crossbridges in rat cardiac muscle as measured by pseudo-random binary noise-modulated perturbation analysis". Circulation Research. 62: 452–461. doi:Ten.1161/01.RES.62.Three.452.
- ^ Grassi, C; Passatore, M (February 1988). "Act of the sympathetic system on skeletal muscle.". Italian journal of neurological sciences. 9 (1): 23–8. PMID2965685.
- ^ abcdefg Liddle DG, Connor DJ (June 2013). "Nutritional supplements and ergogenic AIDS". Prim. Care. 40 (Two): 487–505. PMID23668655. doi:Ten.1016/j.pop.2013.02.009. Amphetamines and caffeine are stimulants that increase alertness, improve concentrate, decrease reaction time, and delay exhaustion, permitting for an enhanced power and duration of training .
Physiologic and spectacle effects
• Amphetamines increase dopamine/norepinephrine release and inhibit their reuptake, leading to central jumpy system (CNS) stimulation
• Amphetamines seem to enhance athletic spectacle in anaerobic conditions thirty nine 40
• Improved reaction time
• Enlargened muscle strength and delayed muscle tiredness