Hi, lin52,
Due to medical concerns, my physician advised me to avoid consumption
of any foods/liquids containing caffeine. He vaguely outlined the
problems caffeine could cause me, but it wasn't until I started
researching your question that I realized just how hazardous this drug
can be to some folks. Thanks for pointing me to this interesting
topic!
Now, back to your question, "How long can caffeine be detected in
blood after consumption?" According to the author of this November,
2003 article, Ron Colburn, here's your answer.
"The metabolic half-life of caffeine ranges from 2.5 to 7 hours
(meaning that, after 7 hours, half the caffeine is still present). It
requires approximately 30 hours for 97% of it to clear the
bloodstream; traces can remain in the body for up to a week."
row2k features
http://www.row2k.com/columns/index.cfm?action=read&ID=135
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Another article gives a time frame that falls within that given by Mr.
Colburn, and provides an example using a definite amount of consumed
caffeine.
"The half-life (of how long the caffeine stays in your body) is about
6 hours. That means that if you consume a big cup of coffee with 200
mg of caffeine in it at 3:00 PM, then by 9:00 PM about 100 mg of that
caffeine is still in your system."
Caffeine
http://www.mcvitamins.com/caffeine.htm
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Here's another that doesn't mention half-life, but generally says that
caffeine takes a considerable time to leave the bloodstream.
"Caffeine is a long-acting drug and it reaches its peak concentration
about 30-60 minutes after ingestion. Since caffeine is broken down
slowly, it can remain in the bloodstream 12 or more hours after
ingestion and this is why, for some people, a lunchtime cup of coffee
can still interfere with nighttime sleep."
21st Century Tips Part I
The Effects of Caffeine on Your Health
http://www.discoverfitness.com/Tips_of_the_Month/March_2002.html
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And finally, an observation with no facts presented can be found here
on this webpage about insomnia.
"A 1995 study showed that poor sleepers do not clear caffeine from
their systems as rapidly as normal sleepers. Even one cup of coffee at
breakfast only was enough to keep them awake at night."
Diagnose-Me: Conditions: Insomnia
http://www.diagnose-me.com/cond/C402606.html
I hope this is useful to you.
Regards,
revbrenda
Search strategy:
caffeine remain bloodstream time
://www.google.ca/search?q=caffeine+remain+bloodstream+time&btnG=Google+Search&hl=en&ie=UTF-8&oe=UTF-8 |
