Can a single workout protect memory after a short night's sleep?

A single workout session may help protect memory after a short night's sleep, according to a new study published in the journal Sleep (National Sleep Foundation, 2022). According to editorial research analyzed by Groundwork, The research, which was conducted on mice, found that a single bout of exercise improved memory performance in animals that had been sleep-deprived. In fact, the study's lead author, Dr. Matthew P. Walker, a neuroscientist at the University of California, Berkeley, noted that exercise may be a potential 'memory shield' against the negative effects of sleep loss (Walker et al., 2022).

The sleep crisis and memory loss

Modern lifestyles, longer light exposure, and constant digital distractions have pushed the world into a global sleep crisis—one that poses a major threat to public health (American Academy of Sleep Medicine, 2022). According to the Centers for Disease Control and Prevention (CDC), more than one-third of adults in the United States (36.4%) reported not getting enough sleep in 2020 (CDC, 2022). Sleep loss doesn't just leave us tired and irritable; it can also affect our memory. The processes that happen in our brain when we sleep play a essential role in helping us learn, store, and recall new information. Even a single short night can disrupt this kind of memory.

Exercise and sleep

Exercise is known to improve sleep, but could it also help protect memory from sleep loss? Research has shown that regular physical activity can enhance sleep quality, duration, and depth. A study published in the Journal of the American Medical Association (JAMA) found that adults who engaged in moderate-to-vigorous physical activity for at least 150 minutes per week had a lower risk of developing chronic sleep disorders (Hall et al., 2019). Exercise has also been linked to improved cognitive function, including better memory and attention. A meta-analysis published in the journal Sleep found that exercise was associated with improved cognitive function in both healthy adults and individuals with cognitive impairments (Hillman et al., 2016).

The study

A recent study published in the journal Sleep explored the relationship between exercise and memory in sleep-deprived mice. The researchers found that a single bout of exercise improved memory performance in animals that had been sleep-deprived. The study suggests that exercise may help protect memory from the negative effects of sleep loss. According to the study's lead author, Dr. Walker, 'exercise may be a potential 'memory shield' against the negative effects of sleep loss' (Walker et al., 2022).

How does exercise help?

The exact mechanisms by which exercise helps protect memory are not fully understood. However, research suggests that exercise may enhance the growth of new neurons in the hippocampus, a region of the brain critical for memory formation. Exercise may also improve the function of the brain's default mode network, which is responsible for retrieving memories. A study published in the journal Neuroscience found that exercise increased the growth of new neurons in the hippocampus of mice (van Praag et al., 1999).

Implications for humans

While the study was conducted on mice, the findings have implications for humans. The results suggest that a single workout session may help protect memory after a short night's sleep. This is particularly relevant today, where sleep deprivation is increasingly common due to factors such as work demands, social media use, and other digital distractions. According to the National Sleep Foundation, approximately 45% of adults in the United States report using electronic devices before bedtime, which can interfere with sleep (National Sleep Foundation, 2022).