Adults who completed more moderate-to-vigorous physical activity performed better on memory tests the following day, while longer periods of REM and deep sleep were also associated with improved cognition.
By yourNEWS Media Newsroom
A single period of moderate-to-vigorous exercise may improve memory and cognitive performance for as long as 24 hours, according to a recent study that tracked adults’ daily activity, sleep and brain function.
Researchers monitored 76 adults in the United Kingdom over eight consecutive days using wearable activity and sleep trackers. Participants also completed daily cognitive assessments measuring memory, attention and processing speed.
The study found that every additional 30 minutes of moderate-to-vigorous physical activity was associated with stronger episodic and working memory performance the following day.
Moderate-to-vigorous exercise included activities such as brisk walking, running, cycling and resistance training.
Light physical activity was associated with weaker benefits, while sedentary behavior did not produce measurable cognitive improvement, according to the researchers.
The findings suggest that the mental benefits of exercise may continue well beyond the period immediately after a workout.
Previous studies have shown that physical activity can temporarily increase alertness and improve executive function. The new research indicates that some memory effects may remain detectable the next day.
Researchers divided participants’ activity into three categories: sedentary behavior, light activity and moderate-to-vigorous activity.
The trackers recorded both the amount and intensity of movement throughout the day.
Each participant completed tests assessing episodic memory, working memory, attention and processing speed.
Episodic memory refers to the ability to recall experiences, events and information from the past. Working memory allows a person to temporarily hold and manipulate information while completing a task or making a decision.
The study also examined sleep stages, including rapid eye movement sleep and deep sleep.
Researchers attempted to separate the effects of exercise and sleep by accounting for factors such as caffeine consumption and the amount of sleep participants received the previous night.
Every additional 30 minutes of REM or deep sleep was associated with improvements in memory and attention the following day, according to the findings.
The results suggest that exercise and sleep may produce independent but complementary benefits for brain function.
Moderate-to-vigorous activity could improve the biological conditions needed for memory and concentration, while restorative sleep may help consolidate information and support the brain’s recovery.
Several biological mechanisms may explain the connection between exercise and cognition.
Aerobic activity and strength training can increase blood flow to the brain, improve oxygen delivery and reduce chronic inflammation.
Exercise may also stimulate changes in the hippocampus, the region of the brain strongly involved in learning and memory.
Research on both aerobic and resistance exercise has found that regular physical activity can support memory retention, protect brain volume and improve cognitive performance.
One small study found that a single exercise session triggered brief bursts of electrical activity in the hippocampus known as ripples.
Those ripples are associated with memory encoding and the organization of newly learned information.
Other research has examined brain-derived neurotrophic factor, commonly known as BDNF.
BDNF is a protein that supports the growth, survival and repair of neurons. It is sometimes described as fertilizer for the brain because of its role in maintaining neural connections.
A 12-week cycling study involving overweight adults found that regular exercise increased BDNF levels.
That finding provides one possible biological explanation for why physical activity may strengthen memory and learning.
Exercise also influences insulin-like growth factor 1, or IGF-1, a hormone involved in muscle growth, nerve development and brain function.
Physical activity may signal the body to produce more growth-related compounds that support both muscular and neurological health.
Researchers have suggested that this response may reflect the conditions under which the human brain evolved.
Regular movement was essential for food gathering, navigation, survival and social activity. Physical exertion may therefore continue to activate biological pathways that support alertness, memory and adaptation.
The study’s findings may have practical implications for people preparing for mentally demanding work.
Researchers suggested that exercising before a day requiring sustained concentration, learning or memory could help improve performance.
A brisk walk, bicycle ride or resistance-training session may be sufficient to produce measurable effects.
The results do not indicate that people must complete strenuous workouts.
Moderate-to-vigorous intensity generally means activity that noticeably raises the heart rate and breathing rate.
Brisk walking may qualify when the pace is fast enough that speaking is possible but singing would be difficult.
Running, cycling, swimming, weight training and many recreational sports can also fall within this category.
Earlier research from Australia found that morning exercise improved working memory in older adults.
That study suggested that physical activity early in the day may help support cognitive performance during the hours that follow.
The current findings extend that possibility by indicating that the effects may persist into the next day.
Sleep quality appeared to be equally important.
REM sleep is involved in emotional processing, learning and memory integration. Deep sleep supports physical recovery and helps the brain organize and preserve newly acquired information.
Participants who spent more time in those restorative sleep stages performed better on memory and attention tests.
Researchers emphasized sleep habits that can improve consistency and quality, including maintaining regular bedtimes and receiving morning light exposure.
Morning light helps regulate the body’s circadian rhythm, which influences sleep timing, hormone production and alertness.
Limiting bright light late at night, keeping a cool and quiet bedroom and avoiding excessive caffeine in the evening may also support deeper sleep.
The study’s results suggest that exercise and sleep should not be viewed as separate health behaviors.
Physical activity can improve sleep quality, while better sleep may help people recover from exercise and maintain the energy needed to remain active.
Together, the two behaviors may create a reinforcing cycle that supports cognitive performance.
Adequate nutrition may contribute as well.
Research on everyday health habits has consistently linked regular exercise, sufficient sleep and a nutrient-dense diet with stronger cognitive function.
These lifestyle measures are generally inexpensive and accessible compared with medical interventions.
They may be especially useful for people seeking to preserve brain function as they age.
Moderate aerobic exercise has also been associated with lower stress and anxiety.
Reducing chronic stress may indirectly improve memory because high levels of stress hormones can interfere with attention, learning and recall.
Exercise may therefore support cognition through both direct neurological effects and improvements in emotional health.
The findings should be interpreted cautiously.
The study was observational, meaning researchers recorded the participants’ natural activity and sleep rather than randomly assigning them to specific exercise programs.
As a result, the study cannot prove that exercise caused the improvements.
People who exercised more may have differed in other ways that influenced cognitive performance.
They may have had better overall health, different diets, stronger motivation or more consistent daily routines.
Although researchers attempted to control for several factors, observational studies cannot eliminate every possible explanation.
The sample was also relatively small, involving 76 adults over only eight days.
A larger and longer study could determine whether the same pattern appears across different ages, occupations and health conditions.
Randomized controlled trials will be needed to confirm how long the cognitive effects last and identify the most effective exercise intensity, duration and timing.
Future studies could compare brisk walking, running, cycling and resistance training to determine whether certain activities produce greater next-day benefits.
Researchers may also examine whether the effects differ among younger adults, older adults and people with memory impairment.
The optimal exercise dose remains uncertain.
The study found benefits associated with each additional 30 minutes of moderate-to-vigorous activity, but it did not establish a minimum amount required for every person.
It also did not prove that progressively longer workouts would produce continuously greater improvements.
Excessive training without adequate recovery can increase fatigue and potentially reduce concentration.
The most useful approach is likely to involve regular, sustainable activity combined with sufficient sleep.
People who are sedentary can begin with short periods of brisk walking and gradually increase the duration and intensity.
Those with cardiovascular disease, mobility limitations or other medical conditions should seek guidance before beginning a strenuous exercise program.
The study adds to evidence that physical activity benefits the brain across the lifespan.
Research summarized in the Routledge Handbook of Physical Activity and Mental Health has linked physical fitness in children with academic achievement and greater hippocampal volume.
Among adults, exercise has been associated with stronger memory, improved mood and a lower risk of cognitive decline.
The new findings suggest that the benefits are not limited to long-term fitness improvements.
A single active day may influence how well a person remembers and processes information the next day.
That possibility makes exercise relevant not only to long-term disease prevention but also to everyday performance.
A student preparing for an examination, an employee facing a demanding project or an older adult trying to preserve memory may all benefit from combining movement with quality sleep.
The study does not establish exercise as a treatment for dementia or other neurological disorders.
It does, however, support the broader conclusion that daily habits can influence measurable aspects of brain function.
Moderate-to-vigorous physical activity, particularly when paired with adequate REM and deep sleep, may provide a practical way to support attention, working memory and recall.
Further research will be needed to confirm the effect and determine the best exercise prescription.
For now, the findings provide another reason to replace some sedentary time with purposeful movement and to treat restorative sleep as an essential part of brain health.
Source: Natural News
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