McGill study finds 20-minute exercise matches 90-minute nap for sleep-deprived memory
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McGill University researchers found that 20 minutes of cycling restored memory performance in sleep-deprived adults as effectively as a 90-minute nap. In a lab study of 54 healthy young adults kept awake for 30 hours, both interventions prevented the memory decline seen in a no-intervention control group, which showed a 22% performance drop. The findings offer a practical alternative for shift workers and others who cannot nap during long workdays.
Key Facts
- McGill University researchers tested 54 healthy young adults kept awake for 30 hours.
- The group that cycled for 20 minutes matched the memory performance of the group that slept for 90 minutes.
- The control group that neither exercised nor slept showed a 22% memory performance decline.
- Co-author Dr. Madhura Lotlikar said exercise is an inexpensive, practical option for shift workers and those without time to nap.
- Researchers noted that 30- to 60-minute naps did not produce significant mental recovery, contrary to expectations.
Study Design
The study was conducted in a laboratory at McGill University in Canada. Fifty-four healthy young adults were kept awake for 30 hours and then divided into three groups. One group cycled for 20 minutes, a second group slept for 90 minutes, and a control group did neither. Memory tests were administered to all participants after the interventions.
Memory Outcomes
The 20-minute exercise group achieved the same success rate in combating memory loss from insufficient sleep as the 90-minute sleep group. The control group that did nothing showed the worst performance, with a 22% memory loss. Researchers found that sleep helps the brain recharge and absorb new information, while exercise makes the brain use existing resources more efficiently. Short naps of 30 to 60 minutes did not provide significant mental recovery, contrary to expectations.
Practical Implications
Co-author Dr. Madhura Lotlikar emphasized that exercise is an inexpensive and practical method accessible to everyone. She noted the method is especially valuable for shift workers and people with intense work schedules who lack time to nap. The study suggests that brief exercise can serve as an alternative to napping for maintaining cognitive performance during sleep deprivation.
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McGill study finds 20-minute exercise matches 90-minute nap for sleep-deprived memory
