Exercise and cognition
14 papers in the library, strongest Moderate.
Graded Moderate · Almost 247,000 adults were followed for up to eleven years; as an observational study it cannot separate cause from effect, and risk factors were asked only once.
Papers 14
- Lonely, Low Mood and Inactive: The Riskiest Mix for DementiaModeraten = 246,9682026Journal of Alzheimer's disease : JADRisk factors for dementia rarely come alone. A large Dutch analysis looked at which combinations in later life were most closely tied to developing dementia. The highest risk showed up in a group where loneliness, low mood and too little physical activity came together. Their risk was 23 percent higher than in people with the most favourable profile. The data came from a 2012 health survey of almost 247,000 adults. The researchers looked at ten risk factors people can change, including high blood pressure, diabetes, hearing loss, alcohol, smoking and depression. A statistical method sorted people into groups with similar patterns. For those over 65, the team tracked who developed dementia up to 2023. A group marked by heavy drinking and smoking had a 16 percent higher risk. A group with heart and metabolic problems had a 12 percent higher risk. These figures already account for social and demographic differences. Still, the study shows links, not causes. It cannot tell whether easing loneliness or moving more in old age prevents dementia. The risk factors were also measured in a single survey.
- Exercise and Engagement Linked to 7 More Years of Clear ThinkingModeraten = 54,2172026Alzheimer's & dementia : the journal of the Alzheimer's AssociationPeople who exercised a lot and also stayed mentally and socially active had the most years free of memory and thinking problems. From age 50, they could expect 24.7 such years on average. People who did little of either could expect 17.5. That is a gap of 7.2 years. Researchers pooled repeated surveys from four long-running studies of aging in Asia, North America and Europe. Participants reported how much structured exercise they did and how engaged they were mentally and socially. Lots of exercise alone went with 23.2 clear years, high engagement alone with 20.1. With both, the risk of developing thinking problems was 30 percent lower than with little of either. With just one, it was about 20 percent lower. So one did not stand in for the other. The most active group also lived longer overall, and spent more years with thinking problems. Everything rests on self-reports and observation, and results varied quite a bit between the four studies. The data cannot show that exercise and engagement themselves caused the difference.
- Mixed Workouts: Older Adults Scored Higher on Thinking TestsModeraten = 6232026Frontiers in aging neuroscienceOlder adults with mild problems in memory and thinking did better on thinking tests after a mixed exercise program. These programs combine several kinds of training, such as endurance, strength and balance. That is the result of an analysis that pooled ten studies with 623 participants in total. In all ten studies, chance decided who exercised. The comparison groups got usual care or health education. Training was mostly moderate, lasting 30 to 90 minutes, two to five times a week, for 8 to 48 weeks. The benefit showed up in overall thinking ability and, more weakly, in skills like planning and adapting. Switching flexibly between tasks clearly improved. For working memory, no clear difference was found. Most studies reported no problems caused by the exercise. Still, results varied widely from study to study. Participants always knew whether they were exercising, which can bias results. The researchers therefore rate the evidence for overall thinking ability as low. Whether a growth factor for nerve cells called BDNF rises stayed unclear: only two studies measured it, with conflicting results.
- Creatine After 45: More Strength Even Without TrainingModeraten = 732026Journal of the International Society of Sports NutritionAdults aged 45 to 65 who had barely exercised took creatine for twelve weeks. Even without training, they gained lean mass, meaning mostly muscle. After twelve weeks the gain averaged about 1.1 kilograms, with wide uncertainty. They also got stronger on the bench press and the leg press than people taking a dummy powder. The study enrolled 73 healthy, inactive adults. Each first chose whether to join a program of exercise and a weight-loss diet. Then chance decided who took 5 grams of creatine twice a day and who got an identical-looking dummy powder. The exercise group did supervised strength and endurance training three times a week. In the end, 64 people finished. With exercise and diet, creatine also added lean mass and strength, and body fat percentage fell further. Memory tests showed only scattered gains, which the researchers call preliminary. Creatinine, a blood value used to check the kidneys, rose slightly. Side effects were rare and similar across groups. The main limit: the four groups ended with only 13 to 20 people each, and exercise was chosen, not assigned by chance.
- Longer Bursts of Brisk Activity Linked to Less DementiaModeraten = 66,4832026Translational psychiatryDoes a single longer stretch of activity count for more than many short ones scattered through the day? Until now, nobody knew. Data from the UK point toward the longer stretch. People whose activity came in longer bouts of moderate to vigorous effort were later diagnosed with dementia less often. The lowest risk came with bouts of 13 minutes: 72 percent lower than in people who never moved that hard. The 66,483 adults wore a wrist activity tracker for one week. They take part in the UK Biobank, a large British health study. Researchers then followed them for about seven and a half years on average. Longer bouts also went along with less depression and anxiety. Here the lowest risk appeared at 36 minutes in one go, roughly half the risk. This held even after accounting for how much people moved in total. Brain scans from part of the group fit the picture. Longer bouts went with a larger left hippocampus, a brain region whose shrinking is a known sign of Alzheimer's. The study only observed people, so it cannot show that the activity itself protects. Only 425 people developed dementia, and most participants were white.
- Early Memory Problems: Every Type of Exercise Beat Doing NothingModeraten = 4,6032026Frontiers in aging neuroscienceMild cognitive impairment is a stage between normal aging and dementia. People who have it are more likely to develop dementia later. A large analysis now finds that every type of exercise studied did better than no training for overall thinking ability. But a different kind of exercise came out on top for each mental skill. The researchers pooled 55 studies with 4,603 people, most of them aged about 60 to 85. In every study, chance decided who trained. Six forms were compared: aerobic, strength, dance, aerobic plus strength, mixed programs with several parts, and gentle mind-body practices such as Tai Chi or Qigong. Mixed programs ranked highest for overall thinking. Tai Chi and similar practices ranked highest for memory. Strength training ranked highest for planning and switching between tasks. Mixed programs at moderate effort, done at least five times a week, were linked to larger gains. That finding comes from comparing different studies, so the authors call it exploratory. Only 21 studies looked at memory and 15 at planning, and not all were free of weaknesses. Whether exercise delays dementia was not tested.
- Aerobic Exercise: 14 of 16 Trials Report Gains in ThinkingModeraten = 162026Frontiers in aging neuroscienceFourteen out of 16 trials pointed the same way. Older adults who did aerobic exercise scored better on thinking tests afterwards than comparison groups. Most participants had mild cognitive impairment, meaning early problems with memory or thinking. The authors describe this kind of mental frailty in later life as a condition that may be reversible. The researchers searched for trials in which chance decided who exercised. Programs ranged from plain aerobic training to Tai Chi, the Chinese Baduanjin routine or kayak paddling, and to exercise done while solving a mental task. All plain aerobic trials and both dual-task trials found improvements. Only the one trial where people exercised first and practised thinking skills separately later found no clear benefit for thinking. The review cannot say how big the benefit is. It simply counted whether each trial found an improvement. Most trials followed people for six months or less, so any effect on dementia risk is unknown. None of the trials measured physical frailty with validated tests.
- Early Memory Problems: Exercise Programs Lifted Test ScoresModeraten = 1,3042026BMJ global healthBy 2050, two-thirds of people with dementia will live in low- and middle-income countries. Yet most prevention programs are being developed in wealthier nations. A new analysis of trials from poorer countries found that in people with early memory problems, exercise programs led to better scores on thinking tests than in comparison groups. The researchers pooled 25 studies with 1,304 participants from six countries, 17 of them in China. In every study, chance decided who joined a program. Participants had mild thinking problems or felt their own memory was slipping. Programs lasted one to six months. Fifteen studies had enough data to combine. The advantage was clear and strongest for exercise. Programs that combined several elements also did better. There is a catch. Small studies without positive results were missing more often than expected, a sign that such results were less likely to be published. Only 9 of the 25 studies met the top quality rating. The analysis cannot say whether these programs prevent dementia: no study counted dementia diagnoses, and thinking was tested right after each program ended.
- Active in Midlife, Slightly Sharper Memory Later OnModeraten = 33,2952026Frontiers in neuroendocrinologyPeople who were physically active between 40 and 59 did a little better on thinking tests years later. This held for overall thinking ability, for memory of words and for mental speed. The differences were small. Still, the authors consider them meaningful when looking at the population as a whole. The team searched for studies that had followed adults without memory problems over many years. Fifteen studies with 33,295 people met the criteria, and just under two thirds were women. Eight could be combined in one calculation. The comparison was between people with little activity and those with moderate to high activity. There was no clear difference in planning and switching between tasks. The same was true for how quickly words came to mind. Every study asked people how active they were instead of measuring it. The results of the single studies also varied widely. Whether the link differs between women and men cannot be said, because only one study looked at the sexes separately. And as observational data, the studies do not show that exercise directly protects thinking.
- Strength Training Shrank Alzheimer-Prone Brain Areas SlightlyModeraten = 902026Age and ageingSix months of strength training changed the brains of older adults in a Spanish study. Afterwards, brain areas that suffer early in Alzheimer's looked slightly thinner and smaller on scans. That sounds worrying at first. The researchers read it more as an adaptation: people whose areas shrank more tended to do better at planning and controlling their thinking. The study included 90 people around 72 years old, none with memory problems. They were chosen at random: 46 trained in a group three times a week for an hour, using elastic bands and body weight. The other 44 kept living as usual. The effect was small. It was larger in people with amyloid, protein deposits typical of Alzheimer's. In people without deposits, no clear difference showed up. A second measure of fine tissue structure did not change clearly either. Whether the change is good or bad cannot be said for sure. The brain changes did not statistically explain the thinking results. Only about one in five had deposits, and nobody was followed after the program ended.
- After One Workout, Thinking Often Gets Sharper for Up to an HourModeraten = 1012026Muscles (Basel, Switzerland)A single brisk cardio session can sharpen thinking for a short while. That pattern runs through 101 studies in adults. After moderate to hard aerobic exercise, people consistently did better on mental tasks, the author reports. They planned and switched between tasks more easily, processed information faster and held more in mind. The boost appeared within minutes and usually lasted up to 30 to 60 minutes. The author searched two large research databases for studies in which adults exercised once or on up to seven days. Thinking was tested before and after. Most studies looked at cardio, but strength training also improved planning and task switching in several of them. Levels of BDNF, a messenger that helps nerve cells grow, often rose in the blood. Yet most studies found no tight link between that rise and better test scores. Exhausting workouts sometimes made it harder to learn new movements. The limits are clear. Most studies had only 15 to 40 people, often young and healthy. A single person picked the studies, and their quality was not formally rated. Whether regular exercise improves thinking in the long run was not what this review asked.
- Exercise and the Brain in Animal Studies: Dose Makes the DifferencePreliminary2026Ageing research reviewsExercise is known as a strong influence on how the brain ages. A new review looks at one stress signal in particular and finds that the type and amount of exercise matter a lot. The signal is a protein called p21. It puts the brakes on cell division and plays a part in cell aging, but it is not the same thing as an aged cell. The direct evidence is sparse and comes from animal studies. Regular, moderate training lowered traces of p21 in the hippocampus, the brain's memory hub, or in the outer brain layer. This held in animals with metabolic stress, natural aging or Alzheimer-like protein deposits. A single treadmill session, by contrast, raised the signal briefly. Excessive swimming kept it high for a long time, along with cell damage, cell death and poorer thinking skills. The authors sort the findings into three states: relief with moderate training, short-term adaptation, and overload. In their view, the evidence fits better with exercise preventing cell stress than with exercise clearing out aged brain cells. What applies to people cannot be read from this work.
- Active Adults Have More Orderly Wiring in the BrainPreliminaryn = 4,1882026Aging cellThe brain's white matter is made of the cables that link one brain region to another. Its condition is considered a sensitive sign of how healthy the brain's blood vessels are. In a study from Bonn, Germany, people who burned more energy in daily life had more orderly nerve fibres in these cables. The gap was largest among the least active. At high activity levels, it levelled off. Researchers looked at 4,188 adults aged 30 to 94 from the Rhineland Study. Each wore a small motion sensor that tracked activity in everyday life, and each had a brain scan. With older age, activity was more strongly tied to favourable readings in some fibre tracts. One finding was unexpected: in the tracts that steer movement, more active people had a lower density of nerve branches. A large part of the links could be explained statistically by body weight, heart and metabolic measures and inflammation markers in the blood. All data come from a single point in time. So the study cannot tell whether activity protects the brain's wiring or whether people with healthier brains simply move more. The participants were also relatively well educated and fairly active.
- Old Rats Remembered More After Interval Runs Than Steady OnesPreliminaryn = 322026BMC sports science, medicine & rehabilitationOld rats that ran in intervals for six weeks remembered a hidden target better than rats that ran at a steady pace. In the final memory test in a water pool, they stayed longer in the right area. While learning the route, both running groups were faster than old rats that did not train. Researchers split 24 old and 8 young male rats at random into four groups. One group of old rats ran steadily on a treadmill for 30 minutes, three times a week. A second group switched between five minutes slow and one minute twice as fast. The other rats did not train. After interval running, the hippocampus, a brain area key to memory, held more BDNF. This is a growth factor for nerve cells. A substance that calms inflammation was also higher there. Steady running instead raised a protective enzyme against cell stress in the hippocampus. In one anxiety test, interval rats hugged the walls less, while a second test showed no clear difference. Each group held only eight male animals. The authors stress that the results transfer to humans only to a limited degree.
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