Research
How exercise preserves physical fitness during ageing – study

New findings may represent promising strategies for promoting muscle function during ageing.
Proven to protect against a wide array of diseases, exercise may be the most powerful anti-ageing intervention known to science.
However, while physical activity can improve health during ageing, its beneficial effects inevitably decline. The cellular mechanisms underlying the relationship among exercise, fitness and ageing remain poorly understood.
In a paper published in the Proceedings of the National Academy of Sciences, researchers at Joslin Diabetes Center investigated the role of one cellular mechanism in improving physical fitness by exercise training and identified one anti-ageing intervention that delayed the declines that occur with aging in the model organism.
Together, the scientists’ findings open the door to new strategies for promoting muscle function during ageing.
“Exercise has been widely employed to improve quality of life and to protect against degenerative diseases, and in humans, a long-term exercise regimen reduces overall mortality,” said co-corresponding author T. Keith Blackwell, MD, PhD, a senior investigator and section head of Islet Cell and Regenerative Biology at Joslin.
“Our data identify an essential mediator of exercise responsiveness and an entry point for interventions to maintain muscle function during ageing.”
That essential mediator is the cycle of fragmentation and repair of the mitochondria, the specialised structures, or organelles, inside every cell responsible for producing energy.
Mitochondrial function is critical to health, and disruption of mitochondrial dynamics the cycle of repairing dysfunctional mitochondria and restoring the connectivity among the energy-producing organelles — has been linked to the development and progression of chronic, age-related diseases, such as heart disease and type 2 diabetes.
“As we perceive that our muscles undergo a pattern of fatigue and restoration after an exercise session, they are undergoing this mitochondrial dynamic cycle,” said Blackwell, who is also acting section head of Immunobiology at Joslin.
“In this process, muscles manage the aftermath of the metabolic demand of exercise and restore their functional capability.”
The effect of exercise
Blackwell and colleagues — including co-corresponding author Julio Cesar Batista Ferreira, PhD, Institute of Biomedical Sciences, University of Sao Paulo — investigated the role of mitochondrial dynamics during exercise in the model organism C. elegans, a simple, well-studied microscopic worm species frequently used in metabolic and ageing research.
Recording wild type C. elegans worms as they swam or crawled, the investigators observed a typical age-related decline in physical fitness over the animals’ 15 days of adulthood. The scientists also showed a significant and progressive shift toward fragmented and/or disorganized mitochondria in the aging animals.
For example, they observed in young worms on day one of adulthood, a single bout of exercise induced fatigue after one hour. The 60-minute session also caused an increase in mitochondrial fragmentation in the animals’ muscle cells, but a period of 24 hours was sufficient to restore both performance and mitochondrial function.
In older (day five and day 10) worms, the animals’ performance did not return to baseline within 24 hours. Likewise, the older animals’ mitochondria underwent a cycle of fragmentation and repair, but the network reorganisation that occurred was reduced compared to that of the younger animals.
“We determined that a single exercise session induces a cycle of fatigue and physical fitness recovery that is paralleled by a cycle of the mitochondrial network rebuilding,” said first author Juliane Cruz Campos, a postdoctoral fellow at Joslin Diabetes Center.
“Ageing dampened the extent to which this occurred and induced a parallel decline in physical fitness. That suggested that mitochondrial dynamics might be important for maintaining physical fitness and possibly for physical fitness to be enhanced by a bout of exercise.”
In a second set of experiments, the scientists allowed wild type worms to swim for one hour per day for 10 consecutive days, starting at the onset of adulthood. The team found that — as in people — the long-term training programme significantly improved the animals’ middle-aged fitness at day 10, and mitigated the impairment of mitochondrial dynamics typically seen during aging.
Exercise and lifespan
Finally, the researchers tested known, lifespan-extending interventions for their ability to improve exercise capacity during aging.
Worms with increased AMPK — a molecule that is a key regulator of energy during exercise which also promotes remodelling of mitochondrial morphology and metabolism — exhibited improved physical fitness. They also demonstrated maintenance of, but not enhancement of, exercise performance during ageing. Worms engineered to lack AMPK exhibited reduced physical fitness during ageing as well as impairment of the recovery cycle. They also did not receive the age-delaying benefits of exercise over the course of the lifespan.
“An important goal of the aging field is to identify interventions that not only extend lifespan but also enhance health and quality of life,” said Blackwell, who is also a professor of genetics at Harvard Medical School.
“In ageing humans a decline in muscle function and exercise tolerance is a major concern that leads to substantial morbidity. Our data point towards potentially fruitful intervention points for forestalling this decline — most likely along with other aspects of aging. It will be of great interest to determine how mitochondrial network plasticity influences physical fitness along with longevity and aging-associated diseases in humans.”
News
NHS to review cost effectiveness of new Alzheimer’s drugs

NICE will review whether new Alzheimer’s drugs should be offered on the NHS after an appeal found their wider impact was not fully counted.
An appeal found that the National Institute for Health and Care Excellence had failed to properly account for the wider impact of the treatments, including the heavy burden on unpaid carers, when calculating the cost effectiveness of the medicines.
Both treatments, lecanemab and donanemab, will now return to a NICE committee for further consideration.
“Today’s ruling is an opportunity for NICE to consider the real cost of Alzheimer’s on people and their families, and we welcome the decision to look again at whether new medicines could be provided on the NHS,” said David Thomas, head of policy and public affairs at Alzheimer’s Research UK.
Lecanemab and donanemab do not cure Alzheimer’s, but they slow it by targeting and clearing clumps of amyloid proteins, sticky protein build-ups in the brain linked to the disease.
While the drugs are available privately in the UK for people who can afford them, NICE ruled last year that they were too expensive to be made available on the NHS in England and Wales.
It is estimated informal dementia care costs the economy more than £20bn a year.
Alzheimer’s Research UK wants NICE to update how it assesses the value of new dementia drugs and factor in the huge additional costs this condition places on society and the wider economy.
NICE and its expert committees assess whether new drugs are good value for money for the NHS based on a wide range of evidence.
This includes how treatments perform in clinical trials, the experiences of patients and carers, and the costs of new drugs as well as any changes to NHS services needed to provide access.
When NICE weighs up whether a new Alzheimer’s drug is cost effective for the NHS, it carries out a limited assessment of the impact dementia has on the health of carers.
But the condition takes an enormous toll on families and society because caring for someone with dementia can lead people to become more isolated and give up work.
It can have a major emotional impact and put families under financial strain.
Thomas said: “Research has delivered new treatments with the potential to provide people with valuable extra months of independence, lessening the burden on carers.
“While these treatments offer modest benefits and can cause serious side effects, they provide the foundation for a future where dementia becomes a treatable condition.
“Now we need NICE to look again at how these medicines could benefit both people with early Alzheimer’s and their carers.”
Chris, whose mother Shirley is living with Alzheimer’s disease, said: “The real cost of Alzheimer’s is far greater than many people realise.
“In order to give my mum the care she needed, I moved back home to help my dad as the care was too much for him alone. After my dad passed away from Covid in 2021, I became sole carer for my mum.
“It was a very difficult period, working a full-time job, caring for Mum and dealing with the loss of my dad. Eventually I got some in-home care support to help.
“The family has borne most of the cost of Mum’s care, both in time and fees, and the family home has been sold to finance it.”
“The emotional and financial strain Alzheimer’s has taken on our family is horrendous, and I know many families across the UK are experiencing this pressure.”
He is backing Alzheimer’s Research UK’s call for NICE to change how it evaluates new dementia treatments.
The timeframe for the next NICE meetings to discuss the drugs is still to be set, and it is not certain follow-up hearings would change NICE’s guidance on access to the medicines.
But Alzheimer’s Research UK is continuing to push to make sure dementia is now a main priority for political and NHS decision-makers.
The head of the ongoing independent review into adult social care, Baroness Louise Casey, has called on the government to act, show leadership and prioritise dementia.
She has proposed appointing a dementia tsar to drive forward the prevention, treatment and care of dementia.
Baroness Casey has also argued for more funding for dementia treatment trials.
With more than 130 Alzheimer’s drugs in clinical trials worldwide, the charity says it is vital the NHS runs trials of new treatments now to understand how to deliver them to eligible patients in future.
In addition to changing how NICE assesses new medicines, the health service needs to collect real-world evidence on new dementia drugs and prepare for diagnostic tests and innovative treatments that are coming.
“Alzheimer’s Research UK is calling on the government to give dementia the same political determination that transformed cancer care,” Thomas said.
“We urgently need investment and a clear UK-wide plan so new treatments can be assessed in the NHS and reach the people who stand to benefit.”
Health and social care secretary Wes Streeting has said dementia is “one of the greatest challenges of our time” and pledged that the UK should become a world leader in dementia clinical trials.
News
Osteoporosis drugs could reduce dementia risk, study suggests
News
Gut health supplement relieves arthritis pain, research finds

A prebiotic fibre supplement may ease arthritis pain and improve grip strength in people with knee osteoarthritis, a study suggests.
The daily supplement, made from inulin, a dietary fibre found in chicory root, Jerusalem artichokes and other vegetables, also lowered pain sensitivity and saw fewer people drop out than a digital physiotherapy programme tested alongside it.
Dr Afroditi Kouraki, lead author of the study from the University of Nottingham, said: ‘Our findings suggest that targeting gut health with a prebiotic supplement is a safe, well-tolerated, and effective way to reduce pain in people with knee osteoarthritis.
“The very low dropout rate compared to the exercise group is also encouraging from a public health perspective, people were able to fit this supplement easily into their daily lives.’
Osteoarthritis of the knee, a wear-and-tear joint condition, affects hundreds of millions of people worldwide and is a leading cause of pain and disability, particularly in older adults.
Current treatments rely heavily on pain medication, which can cause side effects, or exercise programmes, which many patients find hard to maintain.
The INSPIRE trial, led by researchers at the University of Nottingham, involved 117 adults with knee osteoarthritis and tested four groups: inulin alone, digital physiotherapy-supported exercise alone, a combination of both, and a placebo. Both inulin and physiotherapy independently reduced knee pain.
However, inulin alone improved grip strength and reduced pain sensitivity, measures linked to how the nervous system processes pain, while physiotherapy did not.
The dropout rate for those taking the supplement was just 3.6 per cent, compared with 21 per cent for the physiotherapy group, suggesting a daily supplement may be easier for people to stick with than an exercise programme.
Inulin works as a prebiotic, meaning it feeds beneficial bacteria in the gut.
This leads to the production of compounds called short-chain fatty acids, particularly butyrate, which can affect inflammation and pain pathways throughout the body.
Participants taking inulin also showed increased levels of both butyrate and GLP-1, a gut hormone linked to pain regulation and muscle health.
Higher GLP-1 levels were associated with improved grip strength, pointing to a possible gut-muscle connection.
Senior author Professor Ana Valdes added: ‘The link we observed between GLP-1 and grip strength is particularly intriguing and points to a broader gut-muscle-pain axis that warrants further investigation. This could have implications not just for osteoarthritis, but for understanding how gut health influences ageing and physical resilience more broadly.’
Professor Lucy Donaldson, director of research at Arthritis UK, said: “The pain of arthritis can severely impact quality of life. Our recent lived experience survey showed that six in ten people are living in pain most or all of the time due to their arthritis.
“Researchers are starting to explore the role of the gut microbiome in our experience of pain.
“This exciting preliminary research highlights how diet and physiotherapy can act in different ways to have benefits for people with arthritis.
“We know a variety and balance of healthy foods, including fibre, and regular physical activity matter, and we’re glad to be supporting research that explores how they work to help people with arthritis.”
News4 weeks agoCentenarian study probes healthy ageing
News4 weeks agoActive sitting linked to lower dementia risk
Technology4 weeks agoEndogenex raises US$50m for diabetes procedure
News4 weeks agoWorking nights undermines type 2 diabetes management – study
News4 weeks agoUK government announces £6.3m fund to boost men’s health
News4 weeks agoBrain health collaboratory launches in Gulf South
Wellness4 weeks agoSocial isolation is a horrible consequence of dementia – AI could be an answer
News3 weeks agoDiabetes patients face increased risk of undiagnosed heart failure

















