Featured Research

from universities, journals, and other organizations

Internal Body Clock Dictates Timing Of Different Types Of Stroke

Date:
August 18, 2006
Source:
BMJ Specialty Journals
Summary:
The internal body clock, or circadian rhythm, seems to influence the timing of different types of stroke, suggests research published ahead of print in the Journal of Neurology Neurosurgery and Psychiatry. The research team analysed data from almost 13,000 patients who had had one of three types of stroke for the first time, diagnosed by brain scan.

The internal body clock, or circadian rhythm, seems to influence the timing of different types of stroke, suggests research published ahead of print in the Journal of Neurology Neurosurgery and Psychiatry.

The research team analysed data from almost 13,000 patients who had had one of three types of stroke for the first time, diagnosed by brain scan.

These patients' data had been collected on a stroke register, showing that cerebral infarction, where blood flow to brain arteries is restricted, was the most common type of stroke. The rate was 89 per 100,000 of the population.

Subarachnoid haemorrhage, where bleeds occur in the arteries at the brain's surface, was the least common type at 18 per 100,000 of the population. Intracerebral haemorrhage, where bleeds occur within the brain, numbered 45 per 100,000 of the population.

Where the timing of the stroke was recorded as either during waking hours or during sleep, the researchers looked for any obvious patterns among the different types, by dividing the wake-sleep cycle into 12 two hour intervals.

Men tended to be around five years younger than women for all the different types, but there was little variation between the sexes in respect of the timing of the various types of stroke.

All three stroke types registered two peaks during the day, one between 6 and 8 in the morning and the other between 6 and 8 in the evening, with a significant dip in the numbers of strokes occurring during sleep.

But closer analysis showed that cerebral infarction had a higher peak in the morning and a lower peak in the afternoon than the other two.

Intracerebral haemorrhage and subarachnoid haemorrhage, on the other hand, were more likely to have lower peaks in the morning and higher peaks in the afternoon than cerebral infarction.

Around one in five cases of cerebral infarction occurred during sleep, with most cases concentrated in the period immediately before waking up, although the stroke would probably have begun earlier, say the authors.

Sleep lowers blood pressure in the body, so cuts the risk of stroke, but low blood pressure is a risk factor for cerebral infarction, say the authors.


Story Source:

The above story is based on materials provided by BMJ Specialty Journals. Note: Materials may be edited for content and length.


Cite This Page:

BMJ Specialty Journals. "Internal Body Clock Dictates Timing Of Different Types Of Stroke." ScienceDaily. ScienceDaily, 18 August 2006. <www.sciencedaily.com/releases/2006/08/060818174401.htm>.
BMJ Specialty Journals. (2006, August 18). Internal Body Clock Dictates Timing Of Different Types Of Stroke. ScienceDaily. Retrieved September 1, 2014 from www.sciencedaily.com/releases/2006/08/060818174401.htm
BMJ Specialty Journals. "Internal Body Clock Dictates Timing Of Different Types Of Stroke." ScienceDaily. www.sciencedaily.com/releases/2006/08/060818174401.htm (accessed September 1, 2014).

Share This




More Health & Medicine News

Monday, September 1, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Get on Your Bike! London Cycling Popularity Soars Despite Danger

Get on Your Bike! London Cycling Popularity Soars Despite Danger

AFP (Sep. 1, 2014) Wedged between buses, lorries and cars, cycling in London isn't for the faint hearted. Nevertheless the number of people choosing to bike in the British capital has doubled over the past 15 years. Duration: 02:27 Video provided by AFP
Powered by NewsLook.com
Can You Train Your Brain To Eat Healthy?

Can You Train Your Brain To Eat Healthy?

Newsy (Sep. 1, 2014) New research says if you condition yourself to eat healthy foods, eventually you'll crave them instead of junk food. Video provided by Newsy
Powered by NewsLook.com
We've Got Mites Living In Our Faces And So Do You

We've Got Mites Living In Our Faces And So Do You

Newsy (Aug. 30, 2014) A new study suggests 100 percent of adult humans (those over 18 years of age) have Demodex mites living in their faces. Video provided by Newsy
Powered by NewsLook.com
Liberia Continues Fight Against Ebola

Liberia Continues Fight Against Ebola

AFP (Aug. 30, 2014) Authorities in Liberia try to stem the spread of the Ebola epidemic by raising awareness and setting up sanitation units for people to wash their hands. Duration: 00:41 Video provided by AFP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins