Tuesday, 03 October 2023 04:31

Your dementia risk is highest if you sit for longer than this each day

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  • The chances of developing dementia increase if you spend the day sedentary 
  • Experts say this risk increases the longer you spend at a desk or driving Spending more than 10 hours a day sitting down in front of the TV or driving increases the risk of dementia, a study suggests.  Researchers have discovered the chances of developing the condition increase dramatically among adults who spend the majority of their day engaged in sedentary behaviours.                                   A team from the University of Southern California and the University of Arizona analyzed data on more than 50,000 British adults aged 60 and over.

They wore devices on their wrist for 24 hours a day over the course of a week. These devices monitored activity levels and could distinguish between sitting down and sleeping.

While watching TV or driving are common sedentary behaviors, others can include playing video games, using a computer, sitting while commuting or sitting at a desk at work.

The participants were followed for around six years, during which time 414 were diagnosed with dementia.

Analysis revealed that sitting down for 10 hours or more per day was linked to an increased risk of the disease.

Compared to those who spent closer to nine hours a day sitting down, those who spent 10 hours a day sedentary were 8 per cent more likely to develop dementia.

Meanwhile those who spent 12 hours a day sitting down were 63 per cent more likely to be diagnosed, while those who clocked up 15 sedentary hours a day were three times more likely.

Study author Professor Gene Alexander said: ‘We were surprised to find that the risk of dementia begins to rapidly increase after 10 hours spent sedentary each day, regardless of how the sedentary time was accumulated.

‘This suggests that it is the total time spent sedentary that drove the relationship between sedentary behaviour and dementia risk.

‘Importantly lower levels of sedentary behaviour, up to around 10 hours, were not associated with increased risk.’

The study, published in the journal Jama Network Open, also revealed the way sedentary behaviour is accumulated over the course of the day – for example a long period of sitting down followed by activity, or sitting down interspersed with standing up – had a similar link to dementia.

Professor David Raichlen, who also worked on the study, added: ‘Many of us are familiar with the common advice to break up long periods of sitting by getting up every 30 minutes or so to stand or walk around.

‘We found that once you take into account the total time spent sedentary, the length of individual sedentary periods didn’t really matter.’

What is dementia? 

A global concern 

Dementia is an umbrella term used to describe a range of progressive neurological disorders (those affecting the brain) which impact memory, thinking and behaviour. 

There are many types of dementia, of which Alzheimer’s disease is the most common.

Some people may have a combination of different types of dementia.

Regardless of which type is diagnosed, each person will experience dementia in their own unique way.

Dementia is a global concern but it is most often seen in wealthier countries, where people are likely to live into very old age.

How many people are affected? 

The Alzheimer's Society reports there are more than 900,000 people living with dementia in the UK today. This is projected to rise to 1.6 million by 2040.

Alzheimer's disease is the most common type of dementia, affecting between 50 and 75 per cent of those diagnosed.

In the US, it's estimated there are 5.5 million Alzheimer's sufferers. A similar percentage rise is expected in the coming years.

As a person’s age increases, so does the risk of them developing dementia.

Rates of diagnosis are improving but many people with dementia are thought to still be undiagnosed.

Is there a cure?

Currently there is no cure for dementia.

But new drugs can slow down its progression and the earlier it is spotted, the more effective treatments can be.

 

Alzheimer’s Society 

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