So how do you figure, science dudes?
To determine the impact that such mental fatigue might have on subsequent exercise, the researchers first asked 10 healthy, active young men to visit an exercise lab on several occasions. During each visit, the men began by having monitors and an electrode attached to one leg and then vigorously contracting their leg muscles, while the electrode zapped a small amount of electricity into the muscles, augmenting their effort so that they reached their maximum contractile force at that moment. Tired muscles would be expected to produce less force and respond more feebly to the electrical zapping, telling scientists to what degree the body has developed both localized and central fatigue.
Then, during one session, the men sat for 90 minutes before a computer screen, intently watching individual letters flash by while they counted every four and punched various keys, depending on how each grouping of the letters was configured. This test is known reliably to induce mental fatigue.
.... Isn't that like surfing the internet?
