Adrenaline rush

noun

a sudden burst of energy from an increase in the hormone and neurotransmitter adrenaline, esp. increased heart rate and blood pressure, perspiration, blood sugar, and metabolism
Examples

Bungee jumping gives most people an adrenaline rush.
Contemporary Examples

“There’s an adrenaline rush in being in war zones, and there’s no doubt Lara thrived on it,” says CBS News Chairman Jeff Fager.
The Price Lara Logan Paid Howard Kurtz February 19, 2011

And ultimately, he makes you feel the catharsis in violence, the adrenaline rush, and the shame in that.
The Power of ‘Straw Dogs’ Malcolm Jones September 18, 2011

After the adrenaline rush of the emergency came the seemingly never-ending effort to clear away the debris.
Rockaway Finds Warmth Amid the Cold as Residents Rebuild After Sandy Michael Daly November 19, 2012

The adrenaline rush of anticipation, the extra weight of fear as those men walked on into the unknown.
The Marine and His Cousin the Firefighter Maurice Emerson Decaul September 10, 2013

Mike McCurry, the former Clinton White House spokesman, says the “adrenaline rush” of campaigning is clearly changing Obama.
Barack Obama Finds His Voice in Heat of the 2012 Presidential Campaign Howard Kurtz September 24, 2012

“I started with drugs, but it turned out that taking stuff was more of an adrenaline rush than drugs,” says another.
Great Weekend Reads The Daily Beast July 2, 2011

She admits she sometimes misses the adrenaline rush of the lifestyle, danger and all.
Hollywood’s Kept Women Gina Piccalo October 9, 2010