Navigation Links
Clock-shifts affect risk of heart attack

Adjusting the clocks to summer time on the last Sunday in March increases the risk of myocardial infarction in the following week. In return, putting the clocks back in the autumn reduces the risk, albeit to a lesser extent. This according to a new Swedish study published in the prestigious New England Journal of Medicine.

Scientists at Karolinska Institutet have examined how the incidence of myocardial infarction in Sweden has changed with the summer and winter clock-shifts since 1987. Their results show that the number of heart attacks, on average, increases by about five per cent during the first week of summer time.

"There's a small increase in risk for the individual, especially during the first three days of the new week," says Dr Imre Janszky, one of the researchers behind the study. "The disruption in the chronobiological rhythms, the loss of one hour's sleep and the resulting sleep disturbance are the probable causes."

The team also observed that the readjustment back to winter time on the last Sunday in October, which gives us an extra hour's sleep, is followed by a reduction in the risk of heart attack on the Monday. The reduction for the whole week is, however, less than the increase related to the summer adjustment.

According to the scientists, the study provides a conceivable explanation for why myocardial infarction is most common on Mondays, as demonstrated by previous research.

"It's always been thought that it's mainly due to an increase in stress ahead of the new working week," says Dr Janszky. "But perhaps it's also got something to do with the sleep disruption caused by the change in diurnal rhythm at the weekend."

Even though the increase and decrease in risk are relatively small for the individual, the team believes that the study can improve our understanding of how disruptions to diurnal rhythms impact on our health.

"Roughly 1.5 billion people are subjected to these clock-shifts every year, but it's hard to make any generalised statement about how many heart attacks they can cause," adds Dr Rickard Ljung, another member of the research team.


Contact: Sabina Bossi
Karolinska Institutet

Related medicine news :

1. Cutting Salt Wont Affect Foods Safety
2. A childs IQ could be affected by maternal epilepsy
3. Sexual function affected by stem cell transplant according to long-term study
4. Family history of alcoholism affects response to drug used to treat heavy drinking
5. Obesity Wont Affect Seniors Memory
6. Genetic variation affects smoking cessation treatment
7. Schizophrenia candidate genes affect even healthy individuals
8. R rating might be unlikely to affect teens exposure to smoking in movies
9. Painful condition affecting kidney failure patients increases risk of death
10. Patients perceived cancer care unaffected by lower Medicare reimbursements
11. The Current Recall of Boy Scouts of Americas Plastic Badges Does Not Affect Embroidered Insignia, Badges & Awards Produced by Lion Brothers Company Inc.
Post Your Comments:
(Date:11/27/2015)... ... November 27, 2015 , ... The rapid speed at ... people age, more care is needed, especially with Alzheimer’s, dementia and other cognitive ... being overworked. The forgotten part of this equation: 80 percent of medical care ...
(Date:11/27/2015)... ... November 27, 2015 , ... An inventor, ... to dispense prescription medications at home, so he invented the patent-pending ELECTRONIC M.D. ... dispense prescription medications. In doing so, it could help to prevent potential overdose ...
(Date:11/27/2015)... ... 27, 2015 , ... Lizzie’s Lice Pickers just announced a special promotion that ... of their purchase of lice treatment product. In addition, customers will receive a complimentary ... spokesperson. “Finding lice is a sure way to ruin the holidays, so we encourage ...
(Date:11/27/2015)... ... November 27, 2015 , ... ProSidebar: Fashion is a set ... With ProSidebar: Fasion, video editors can easily add an informative sidebar to any ... opener. Utilize presets featuring self-animating drop zones, lines, bars, and text with the ...
(Date:11/27/2015)... ... November 27, 2015 , ... ... through sharing, the 2016 Building Better Radiology Marketing Programs meeting will ... on Sunday, March 6, 2016, at Caesars Palace in Las Vegas with a ...
Breaking Medicine News(10 mins):
(Date:11/26/2015)... FRANCISCO , November 26, 2015 ... billion by 2022, according to a new report by Grand ... Chronic Kidney Disease (CKD) which demands kidney transplantation is expected ... and cost effective substitute for organ transplantation. --> ... billion by 2022, according to a new report by Grand ...
(Date:11/26/2015)... --> ... att använda SyMRI för att hitta optimal ... med multipel skleros (MS) eller hjärntumörmetastaser och ... för att kunna använda SyMRI Research Edition ... kan man generera flera konstrastbilder från en ...
(Date:11/26/2015)... DUBLIN , Nov. 26, 2015 ... the addition of the "2016 Future Horizons ... Monitoring (TDM) Market: Supplier Shares, Country Segment Forecasts, ... offering. --> ... comprehensive analysis of the Italian therapeutic drug monitoring ...
Breaking Medicine Technology: