Sleep disorder linked with brain changes found in dementia
Sydney, July 5: A sleep disorder that causes repeated shallow or paused breathing may be associated with changes in brain structure that are also seen in the early stages of dementia.
Obstructive sleep apnoea (OSA), common among elderly, is a condition where the walls of the throat relax and narrow during sleep, stopping breathing, and is known to reduce levels of oxygen in the blood. It has also been linked with heart diseases, strokes and cancer.
The new study suggested that the drop in oxygen may be linked to a shrinking of the brain's temporal lobes and a corresponding decline in memory.
"Between 30 and 50 per cent of the risk for dementia is due to modifiable factors, such as depression, high blood pressure, obesity and smoking. In recent years, researchers have recognized that various sleep disturbances are also risk factors for dementia," said lead author, Sharon Naismith, from the University of Sydney, Australia.
"We wanted to look specifically at obstructive sleep apnoea and its effects on the brain and cognitive abilities," Naismith added.
In the study, published in European Respiratory Journal, the researchers analysed data from nearly 100 participants aged between 51 and 88 years, who had visited doctors with concerns over their memory or mood but had no OSA diagnosis.
The results showed that patients who had low levels of oxygen in their blood while they were sleeping tended to have reduced thickness in the left and right temporal lobes of the brain -- regions known to be important in memory and affected dementia.
Further, the team found that this alteration in the brain was linked with participant's poorer ability to learn new information.
"There is no cure for dementia so early intervention is the key. On the other hand, we do have an effective treatment for OSA. This research shows that diagnosing and treating OSA could be an opportunity to prevent cognitive decline before it's too late," Naismith added.
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BCCI likely to remove assistant coach Abhishek Nayar; support staff set for overhaul
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New Delhi (PTI): Just eight months into the biggest assignment of his career, it could be curtains for Mumbai stalwart Abhishek Nayar as the Indian cricket team's assistant coach amid speculation that he has fallen out with a high-profile member of the support staff.
If board sources are to be believed, Nayar has already been intimated of the BCCI's decision to part ways with him.
Fielding coach T Dilip, and Strength and Conditioning coach Soham Desai are also on their way out after completing more than three years in their respective positions.
The new Standard Operating Procedure (SOP) of the BCCI has capped the support staff's tenure at three years.
It is learnt that India's first ever Strength and Conditioning coach Adrian Le Roux is likely to return for a second stint. The South African is widely credited for ushering in a new fitness culture in the then Sourav Ganguly-led Indian team during the 2003 World Cup.
When BCCI secretary Devajit Saikia was contacted by the PTI, he neither confirmed nor denied the development.
"Certain things are being finalised. You will receive a press note from BCCI in some days," Saikia said asked about the swirling speculation.
The 41-year-old Nayar, a former all-rounder who played three ODIs but was largely a domestic stalwart with 103 first-class games, didn't respond to a text message sent by PTI.
His presence deemed "counter-productive"
It is learnt that Nayar's removal was on cards after Sitanshu Kotak was added to the Indian team's support staff as an additional batting coach.
"...just after the tour of Australia, there was a review meeting conducted by the BCCI. The top officials of the board, including secretary Devajit Saikia and vice-president Rajeev Shukla, were present along with important members associated with the Indian team, and the national selectors," a senior BCCI source told PTI on conditions of anonymity.
"On the sidelines of the meeting, a powerful member of the support staff expressed his apprehensions about Nayar's presence and said how him being in the dressing room is proving to be counter-productive.
"While the BCCI didn't act immediately but they brought in Kotak, the former Saurashtra run-accumulator. It was a way of side-lining Nayar during the Champions Trophy," the source added.
It is understood that Nayar was never the first-choice assistant for head coach Gautam Gambhir when the appointments were finalised. The 41-year-old Nayar was appointed as he was seen as someone who could act as a bridge between Gambhir and skipper Rohit Sharma.
Nayar and Dilip have been the Indian skipper's "most trusted lieutenants" and it is not known whether Rohit was kept in the loop by the BCCI mandarins about these decisions.
