Moving clocks forward raises MI risk by 5 per cent

Moving the clocks forward an hour to mark the start of summertime increases the risk of MI in the following week, a Swedish study has found.

The researchers examined how the incidence of MI in Sweden had changed with the summer and winter clock shifts since 1987.

Overall, they found that the number of heart attacks increased by 5 per cent during the first week of summertime.

The risk was greatest in the first three days after the clocks went forward, and for people under the age of 65.

But readjusting the clocks back to winter time reduced the risk of suffering a heart attack in the following week.

Lead researcher Dr Imre Janszky, from the Karolinska Institute in Stockholm, said that the disruption in the chronobiological rhythms, the loss of one hour's sleep and the resulting sleep disturbance were the probable causes for the increased MI risk.

The researchers add that they hope the research findings will lead to an improved understanding of how night and day cycles can have an impact on patients' health.

NEJM 2008; 359: 1,966-68

Comment below and tell us what you think

Have you registered with us yet?

Register now to enjoy more articles and free email bulletins

Register

Already registered?

Sign in

Before commenting please read our rules for commenting on articles.

If you see a comment you find offensive, you can flag it as inappropriate. In the top right-hand corner of an individual comment, you will see 'flag as inappropriate'. Clicking this prompts us to review the comment. For further information see our rules for commenting on articles.

comments powered by Disqus