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Memory-boosting trick: Exercise 4 hours after learning

An athlete stretches in front of Recreio dos Bandeirantes beach before the Rio de Janeiro International Marathon in Rio de Janeiro July 17, 2011. REUTERS/Ana Carolina Fernandes (BRAZIL - Tags: SPORT ATHLETICS)
An athlete stretches in front of Recreio dos Bandeirantes beach before the Rio de Janeiro International Marathon in Rio de Janeiro July 17, 2011. REUTERS/Ana Carolina Fernandes (BRAZIL - Tags: SPORT ATHLETICS)

Washington: Turns out, going to the gym not only makes you stronger, but also smarter.

A new study has suggested an intriguing strategy to increase your chances of remembering new information: Just hit the gym four hours later. The findings show that physical exercise after learning improves memory and memory traces, but only if the exercise is done in a specific time window and not immediately after learning.

“It shows that we can improve memory consolidation by doing sports after learning,” says Guillen Fernandez of the Donders Institute at the Radboud University Medical Center in the Netherlands.

In the new study, Fernandez, along with Eelco van Dongen and their colleagues, tested the effects of a single session of physical exercise after learning on memory consolidation and long-term memory. Seventy-two study participants learned 90 picture-location associations over a period of approximately 40 minutes before being randomly assigned to one of three groups: one group performed exercise immediately, the second performed exercise four hours later, and the third did not perform any exercise.

The exercise consisted of 35 minutes of interval training on an exercise bike at an intensity of up to 80 percent of participants’ maximum heart rates. Forty-eight hours later, participants returned for a test to show how much they remembered while their brains were imaged via magnetic resonance imaging (MRI).

The researchers found that those who exercised four hours after their learning session retained the information better two days later than those who exercised either immediately or not at all. The brain images also showed that exercise after a time delay was associated with more precise representations in the hippocampus, an area important to learning and memory, when an individual answered a question correctly.

“Our results suggest that appropriately timed physical exercise can improve long-term memory and highlight the potential of exercise as an intervention in educational and clinical settings,” the researchers conclude.

The study appears in the Cell Press journal Current Biology. (ANI)

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