Wellness
Exercise improves brain function, possibly reducing dementia risk
Insulin, which is produced by the pancreas and travels to the brain to perform its functions, plays a central role in promoting brain blood flow and neuronal functioning for cognition.
A study led by scientists at Rutgers University-New Brunswick has shown that specialized cells involved in how the body responds to insulin are activated in the brain after exercise, suggesting that physical activity may directly improve brain function.
A study, published in Aging Cell, a journal focused on the biology of aging, indicates that therapies targeting this insulin action may be developed to offset or even prevent dementia progression.
“We believe this work is important because it suggests exercise may work to improve cognition and memory by improving the abilities of insulin to act on the brain,” said Steven Malin, an associate professor in the Department of Kinesiology and Health in the Rutgers School of Arts and Sciences and lead author of the study.
Conducted in collaboration with the National Institutes of Health’s National Institute on Aging, the researchers focused on the role of neuronal extracellular vesicles, specialized cells released by the brain.
Extracellular vesicles, once dismissed by researchers as “cell dust,” have in the past 15 years grown exponentially in recognition as important players in the microscopic world of the human body, facilitating transport of key molecules such as proteins between cells. For this study, the scientists targeted vesicles produced in the brain that ferry several proteins involved in insulin sensitivity – one of which is called Akt.
Insulin sensitivity is a measure of how well the body responds to insulin, a hormone that controls blood sugar levels. People with high insulin sensitivity can use blood glucose more effectively in the body, such as in its muscles, which reduces blood sugar. People with diabetes, with its key symptom of low insulin sensitivity or insulin resistance, have brain cells that are less responsive to insulin. This can have negative impacts on cognition.
Researchers were able to study the vesicles by isolating them in the blood of participants in an experimental study. The trial, conducted over two weeks, included a group of 21 volunteers who had an average age of 60 and had prediabetes. Over the course of the study, they engaged in 12 individual, supervised, 60-minute exercise sessions of moderate to high intensity. The participants ingested a glucose drink before and after training. Researchers then collected blood samples before and during the drink from the participants at the start and end of exercise training.
The blood samples showed that the number of neuronal vesicles carrying proteins involved in insulin sensitivity increased after each training, with Akt being most notable.
“We showed for the first time that exercise impacts insulin signaling from neuronal extracellular vesicles in relation to clinical improvements in blood sugar,” Malin said. “And we use these neuronal extracellular vesicles as an indicator of brain insulin sensitivity.”
Exercise, therefore, is potentially able to improve the brain’s capacity to respond to insulin for neuronal function, he said.
Insulin is a hormone increasingly recognized to regulate cognition, the mental process of acquiring knowledge through thought, experience and the senses. Prediabetes is a serious health condition that occurs when blood sugar levels are higher than normal but not high enough to be diagnosed as Type 2 diabetes. Those with prediabetes run the risk of having insufficient levels of insulin in their bodies, particularly the brain, which increases the chances of developing diseases of dementia such as Alzheimer’s, Malin said.
Insulin also plays a crucial role in memory formation, recall, processing speed and the functioning of synapses, structures that allow brain cells to communicate with one another.
“If insulin is insufficient in the brain, that means not only will brain cells become potentially dysfunctional, but also they may fail to interact with each other properly,” Malin said. “It’s like playing the game telephone with a friend. At some point the message gets lost when the brain becomes insulin resistant.”
Exercise has long been believed to improve cognition, but the mechanisms involved have been unclear. Past studies have uncovered evidence that high blood sugar contributes to a decrease in the brain’s ability to recall information and learn new information.
Malin said that insulin, which is produced by the pancreas and travels to the brain to perform its functions, plays a central role in promoting brain blood flow and neuronal functioning for cognition.
“Our work suggests that therapies that target brain insulin action may be able to ward off dementia,” Malin said.
In a new study, Malin and his colleagues are examining whether a single bout of exercise can enhance the ability of intranasal insulin to support cognitive health in aging adults with obesity by measuring brain blood flow and neuronal extracellular vesicles. Their future plans are to conduct a long-term exercise training study that assesses brain insulin sensitivity improvements in relation to cognition in older adults.
Other Rutgers scientists on the study included Michal Beeri, director of the Herbert and Jacqueline Krieger Klein Alzheimer’s Research Center at Rutgers
Robert Wood Johnson Medical School; and Daniel Battillo, a doctoral candidate in the kinesiology and applied physiology graduate program. Scientists from the National Institute of Health’s National Institute on Aging involved in the study included Dimitrios Kapogiannis, Maja Mustapic and Francheska Delgado-Peraza.
Wellness
Exercise to treat depression yields similar results to therapy
Depression is a leading cause of ill health and disability, affecting over 280 million people worldwide. Exercise is low-cost, widely available, and comes with additional health benefits, making it an attractive option for patients and healthcare providers.
Exercise may reduce symptoms of depression to a similar extent as psychological therapy, according to an updated Cochrane review. When compared with antidepressant medication, exercise also showed a similar effect, but the evidence was of low certainty.
Depression is a leading cause of ill health and disability, affecting over 280 million people worldwide. Exercise is low-cost, widely available, and comes with additional health benefits, making it an attractive option for patients and healthcare providers.
The review, conducted by researchers from the University of Lancashire, examined 73 randomized controlled trials including nearly 5,000 adults with depression. The studies compared exercise with no treatment or control interventions, as well as with psychological therapies and antidepressant medications.
The results show that exercising can have a moderate benefit on reducing depressive symptoms, compared with no treatment or a control intervention. When compared with psychological therapy, exercise had a similar effect on depressive symptoms, based on moderate-certainty evidence from ten trials. Comparisons with antidepressant medication also suggested a similar effect, but the evidence is limited and of low certainty. Long-term effects are unclear as few studies followed participants after treatment.
Side effects were rare, including occasional musculoskeletal injuries for those exercising and typical medication-related effects for those taking antidepressants, such as fatigue and gastrointestinal problems.
“Our findings suggest that exercise appears to be a safe and accessible option for helping to manage symptoms of depression,” said Professor Andrew Clegg, lead author of the review. “This suggests that exercise works well for some people, but not for everyone, and finding approaches that individuals are willing and able to maintain is important.”
The review found that light to moderate intensity exercise may be more beneficial than vigorous exercise, and that completing between 13 and 36 exercise sessions was associated with greater improvements in depressive symptoms.
No single type of exercise was clearly superior, although mixed exercise programmes and resistance training appeared more effective than aerobic exercise alone. Some forms of exercise, such as yoga, qigong and stretching, were not included in the analysis and represent areas for future research. Long-term effects are unclear as few studies followed participants after treatment.
This update adds 35 new trials to previous versions published in 2008 and 2013. Despite the additional evidence, the overall conclusions remain largely unchanged. This is because the majority of trials were small, with fewer than 100 participants, making it difficult to draw firm conclusions.
“Although we’ve added more trials in this update, the findings are similar,” said Professor Clegg. “Exercise can help people with depression, but if we want to find which types work best, for who and whether the benefits last over time, we still need larger, high-quality studies. One large, well-conducted trial is much better than numerous poor quality small trials with limited numbers of participants in each.”
Wellness
Aerobic exercise may be most effective for relieving depression/anxiety symptoms
While supervised and group exercise may be best for reducing depression, shorter (up to 8 weeks) lower intensity exercise may be best for relieving anxiety.
Aerobic exercise, such as running, swimming, and dancing, may be most effective for relieving the symptoms of depression and anxiety, finds an overarching (umbrella) review and data synthesis of the available evidence, published in the British Journal of Sports Medicine.
While supervised and group exercise may be best for reducing depression, shorter (up to 8 weeks) lower intensity exercise may be best for relieving anxiety.
But all forms of exercise are as good as, or better than, medication and talking therapies, regardless of age or sex, the findings indicate.
Depression and anxiety affect up to 1 in 4 people worldwide, with the highest prevalence among young people and women, note the researchers. And previously published research suggests that exercise compares favourably with psychotherapy and medication for easing the symptoms, they add.
But it’s not clear how well exercise might work at different ages, frequency, and intensities.And previous overarching syntheses have focused only on adults or included participants with potentially influential factors, such as long term conditions.
The researchers therefore set out to comprehensively estimate the impact of exercise on depression and anxiety symptoms across all age ranges, including in those with and without a clinical diagnosis; and to find out whether the type, length, frequency, intensity, and supervision of exercise, and individual or group participation might influence outcomes.
They scoured research databases for pooled data analyses of randomised controlled trials that compared exercise with either another type of activity, or a placebo, or no active intervention, and published in English up to July 2025.
Eligibility criteria included planned, structured, repetitive and purposeful physical activities to improve physical and mental health; and all forms, intensities, frequencies and settings (individual or group) of exercise.
For depression, 57 pooled data analyses, comprising 800 component studies, involving 57,930 participants aged between 10 and 90, were included in the overarching synthesis.
These participants had been diagnosed with clinical depression or were experiencing depressive symptoms, but had no other co-existing conditions. Exercise interventions were categorised as aerobic (19 pooled data analyses); resistance, such as strength training (8); mind–body, such as yoga, tai-chi, and qigong (16); or a mix (39).
For anxiety, 24 pooled data analyses, comprising 258 component studies, involving 19,368 participants, aged between 18 and 67, were included in the overarching synthesis. Exercise interventions were categorised as aerobic (7); resistance (1); mind–body (9); or mixed (13).
Synthesis of the pooled data analyses showed that exercise had a medium sized effect on depression symptoms and a small to medium sized effect on anxiety symptoms, with the most substantial effects found for young adults (18-30) and women who had recently given birth.
All forms of exercise were associated with positive effects, with aerobic, group based and supervised formats the most effective for relieving depression symptoms. Aerobic, resistance, mind–body and a mix of different exercise formats had a medium sized impact on the relief of anxiety symptoms.
The effects were on a par with, or better than, medication or talking therapies.
The researchers acknowledge some limitations to their findings. These include the variable interpretations of exercise intensity and length among the pooled data analyses, and the relative paucity of pooled data analyses on the impact of exercise across the lifespan.
But they nevertheless conclude: “This meta-meta-analysis provides robust evidence that exercise effectively reduced depression and anxiety symptoms across all age groups, comparable with, or exceeding, traditional pharmacological or psychological interventions.
“Group and supervised formats gave the most substantial benefits, underscoring the importance of social factors in mental health interventions. With evidence that different characteristics of exercise appear to impact depression and anxiety at varying magnitudes, tailored exercise programmes must be prescribed.”
They continue: “Given the cost effectiveness, accessibility, and additional physical health benefits of exercise, these results underscore the potential for exercise as a first line intervention, particularly in settings where traditional mental health treatments may be less accessible or acceptable.”
Wellness
Dance effective in fighting against cognitive decline in Parkinson’s
Dance can be beneficial in halting the cognitive decline associated with Parkinson’s disease and, for some participants, they even showed signs of improvement.
A new study led by researchers at York University shows that dance can be beneficial in halting the cognitive decline associated with Parkinson’s disease and, for some participants, they even showed signs of improvement. Faculty of Health Associate Professor Joseph DeSouza, co-author of the study, says since cognition is nearly always expected to decline as the illness progresses and this was a multi-year study, the findings are quite remarkable.
“The classic progression of Parkinson’s disease is that cognition gets bad as well as motor symptoms, and some people already have significantly impaired cognition by the time they get to a diagnosis,” says DeSouza, who worked closely on the study with lead author Simran Rooprai, a second-year interdisciplinary master’s student at York. “So finding that no one in the dance group had further cognitive decline over six years, we think that’s pretty significant.”
The study, published in the Journal of Alzheimer’s Disease, looked at 43 participants from a group with Parkinson’s participating in the Sharing Dance Parkinson’s program at the National Ballet of Canada and the Dance for Parkinson’s Disease program through Trinity St. Paul’s Church, both located in Toronto, and a reference group of 28 people with Parkinson’s who were sedentary and not engaged in any physical activity.
Dance classes would begin with a seated warm-up, followed by “barre” exercises, and sessions ended with floorwork dances. One group was also taught a specific choreography in preparation for an upcoming performance.
The researchers found that the cognitive scores for the dance group had improved compared to the reference group, where they saw no changes, or a slight decline.
Rooprai says the research shows that dance could help with cognitive preservation, or perhaps even improvement in those with Parkinson’s.
“We can’t really fix the brain, but we’re trying to show that with dance, maybe we can delay the onset of further cognitive decline,” says Rooprai.
While Parkinson’ disease is most closely associated with the characteristic tremors of the disease, it is also associated with cognitive decline, with four out of five people with the illness eventually experiencing severe cognition problems as the disease progresses.
Earlier research led by DeSouza at York that he worked on with fellow author and former York PhD student Karolina Bearss, now a professor at Algoma University, has shown the benefits of dance for depression and motor symptoms of the illness, suggesting the benefits of dance are widespread.
“Dance engages many parts of the brain,” says Rooprai. “While dancing, you’re listening to music, learning new steps, remembering the different sequences, and you’re engaging with other dancers so you’re aware of your surroundings. Dance is physical, mental, and social all at once.”
DeSouza and Rooprai are working on a follow-up study in collaboration with the Baycrest Academy for Research and Education, where they will look at how working memory is affected for people with Parkinson’s taking weekly dance classes.
“Given how dance has so many different positive impacts on cognition, we expect to see improvements,” says DeSouza.
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