[CQ-Contest] Sleep Deprivation

[Ronald Rossi]

Folks,

The graph is showing the performance of two populations...those which
eventually were given caffeine and those which never received any. By
showing the two populations as indivual lines allows you to verify the
correlation of them prior to receiving the drug. It seemed clear to me,
but it is not all that obvious I guess.


Mike Gilmer - N2MG wrote:
> 
> I don't know...It is a confusing graph and set of
> captions/words.
> 
> Since there are separate lines (black and red) for
> caffeine and non-caffeine BEFORE the 48hour point,
> that tells me that they we administering caffeine all
> along. The result being that little benefit was gained
> from the caffeine prior to the pre-48-hour point.
> 
> However on another page, it says, "we established that
> a single dose of caffeine (300-600 mg; the equivalent
> of 3-6 cups of brewed coffee) can improve performance
> for 10-12 hours after 48 hours without sleep"
> 
> This seems to imply that no caffeine was administered prior to teh 48-hr point.  So why the separate graph
> lines (red and black) prior to 48 hours?
> 
> Mike N2MG
> 
> On Thu, 04 October 2001, Sylvan Katz wrote:
> 
> >
> >
> > >http://wrair-www.army.mil/depts/behavbio/caf2.gif
> > >
> > > which for those who can't be bothered to click on it, shows that for 48
> > > hours at least, a placebo worked as well as caffeine....
> > >
> > > 73s Tim EI8IC
> >
> >
> > Ooops - that is not the way I read the graph.
> >
> > The graph seems to say that if 600 mg of caffeine is administer after 48
> > hours of sleep deprivation (note the arrow to the 48 hours mark under the
> > legend) those that receive caffeine exhibited a significant increase in
> > throughput (about 25% increase) for the next 10-12 hours compared to the
> > placebo group.
> >
> > In fact in the text the researchers say:
> > "In a search for a safe, effective stimulant to sustain performance when
> > sleep is not possible due to operational reasons, we established that a
> > single dose of caffeine (300-600 mg; the equivalent of 3-6 cups of brewed
> > coffee) can improve performance for 10-12 hours after 48 hours without sleep
> > (see figure: Caffeine after 48 Hours of Sleep Deprivation: Performance on
> > Serial Addition/Subtraction). Caffeine, in tablet form, is currently
> > considered the drug of choice for the stimulant to sustain performance
> > component of the Sleep Management System."
> >
> > This restores my faith in a couple of good cups of Java during a contest :-)
> >
> > .. sylvan
> 
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