http://y42.briefcase.yahoo.com/bc/zekebrules/vwp?.dir=/My+Docum ents&.dnm=halflives.JPG&.src=bc&.view=t&.hires=t

quote:

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Originally posted by beefmaster:
Thats pretty cool. You could actually reverse the data and come up with detection times as well. Not everyone has a yahoo password to view it though so I bet thats why responses have been low.

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Do you mean swap x and y? I don't do Yahoo, and I see it ok.

Or at least, not necessarily USEFUL to us the way it is shown.

Why?

Consider this, there is a differnce between something being "in the body:" and it being active.

Sure, the moment , THE MOMENT that you inject TestCyp into your body, its 100% IN THERE. Correct. But is it ACTIVE? No.

It takes a few days or weeks for the more popular Esters to RELEASE the Test so that it is actually moving throughout your body.

So, there are actually 2 things at work here - firsty, how long does it take for the ester to release the substance, then how long does that substance stay active once it has been released.....

I think if you look at that, actually the avalaible amount of Test in your system due to various component, you would see a "bump" sort of graph, starting at zero concentration at time zero ...... rising to a maximum level over time (depending upon how long it took for the ester to release that actual Test into your system. ........ then for the conecntration to lower as the available amount was released and utilized.

Nothing personal to the bro who did the graph.

It look alsmots as if someone took one opf those little "half life" table, and pout that into Exccel, and graphed it ouyt based on a descending slope formula (whatever the std formula is for a half-life numeric progression ....)

Q(t) = Qo * exp(r * t)

r is a constant function of the halflife.
I believe it's -ln(2)/halflife. If anyone
is curious I can re-derive it. I left
everything at work.

Here is the way I would use a plot such as
this. Most of the drug that is in the body
at any moment is bound to the ester and
sitting dissolved in oil in the muscle
tissue where it was injected. Since for a
relatively small percentage of the time the
drug is actually in the bloodstream and
doing it's work, I think the rate at which
the drug is leaving the body at any moment
would correlate very nicely to the amount
of the drug entering the bloodstream and
therefore correlate to the steroidal effect
at that moment. In other words, what should
be looked at is the first derivative with
respect to time or the slope of the plot.

This makes sense because as everyone knows,
test with shorter halflives works faster
than test with longer halflives. This is
because it is entering the bloodstream and
being used by muscles at a much faster rate
or in other words the slope is steeper on my
plot.

One effect is that of the ester release - so, this would start at zero, and we would see it rise up to a level of 100% (nominalized of course, saying that at some time in the futute, 100% of the Test which was bound to the ester had in fact been released into the bboody or bloodstreem .... my limited detailed knowledge of biology starting to show when we get into specifcs....)

Then a second effect, which was, of the Test which HAD been released, we would see that this would indded drop off at a constant rate.

This would give us a bump, whose delay from ingestion (how long it takes to get to a usable conentration) and the relative "letngth" of that bump would be determined by the ester involved.

But these graphs which show 100% at day or TIME zero are meaningless for our uses.