I forgot one. In this discussion, it was discovered that the negative effects that are being blame on caffeine are in fact that result of an increase in epinephrine release. This is also why I was pointing that anything that increases your heart rate would have the same effect. Well, with that in mind, if caffeine and epi release was so harmful to health and activity, then it would follow that those who are one beta blockers which decrease heart rate would be healthier than those who experience a higher release of epi, right? Wrong. The study, “Exercise metabolism in healthy
volunteers taking celiprolol, atenolol, and
placebo”
(A Head, S Maxwell and MJ Kendall
Department of Sport Sciences, Brunel University College, Isleworth, Middlesex, United Kingdom. ) showed that while those taking the beta blockers experienced significantly lower mean exercising heart rates, this decrease may have also contributed to the increase in fat oxidation during exercise, not exactly going in the positive direction as far as preventing obesity which is the major contributor of insulin resistance.
I wish there was a spell check feature on this board…Please disregard the previous copy due to mistakes and errors:
I forgot one. In this discussion, it was discovered that the negative effects that are being blamed on caffeine are in fact the result of an increase in epinephrine release. This is also why I was pointing that anything that increases your heart rate would have the same effect. Well, with that in mind, if caffeine and epi release were so harmful to health and activity, then it would follow that those who are on beta blockers, which decrease heart rate, would be healthier than those who experience a higher release of epi, right? Wrong. The study, “Exercise metabolism in healthy
volunteers taking celiprolol, atenolol, and
placebo”
(A Head, S Maxwell and MJ Kendall
Department of Sport Sciences, Brunel University College, Isleworth, Middlesex, United Kingdom. ) showed that while those taking the beta blockers experienced significantly lower mean exercising heart rates, this decrease may have also contributed to the decrease in fat oxidation during exercise, not exactly going in the positive direction as far as preventing obesity which is the major contributor of insulin resistance.
I’m actually mostly in agreement with
Professor X here. I am not in competition
with anyone here. And I would rather determine
the “truth” - even if it means I am “wrong.”
I posted that reference about exercise
partly offsetting (note that they didn’t
say "completely offsets) the effects of
caffeine on insulin resistance because it was
relevant, and specifically because it provided
contrary evidence. If I was trying to push
some agenda, and make myself “right” and
others “wrong” I wouldn’t have posted it. As
far as Prof X’s objections go, if you take the
time to read the other messages I’ve posted on
this subject, you’ll basically see that 1)I
already admitted that exercise improves
insulin sensitivity, 2)that I think that
athletes are at lower risk for problems from
caffeine that sedentary folk, and 3)that diet
and exercise are more important than caffeine
in addressing insulin resistance. However
caffeine is still an important and
contributing factor. Also as I’ve already
said, IF you are both an athlete, and do NOT
have any genetic predisposition to insulin
resistance, then caffeine will not pose much
risk to you. If you are sedentary and/or if
you are an athlete with a genetic history
of insulin resistance, then caffeine does pose
some risk. (I happen to fall into the latter
category, and I have single digit % body fat
and exercise regularly, yet caffeine still
truly messes me up. So the argument that Prof
X makes at the end of his previous post is
true for many people. But not for all people.)
As far as I’m concerned, there is much less
disagreement here than people are making it
out to be. And if you read the other posts I
wrote on this, you would see that. Everything
I’ve written in this message is a repeat of
what I’ve already written on this topic.
Professor X, I am glad to see you are finally doing some research before making comments. I agree with your analysis of these studies for the most part. The study did say that “exercise reduces the detrimental effects of caffeine on insulin action in muscle”; however it did not totally eliminate it. I just feel if you have great glucose tolerance while you are on caffeine you will have even better glucose tolerance when off of caffeine, even if you exercise often. There needs to be a study done which addresses this more directly in athletes over a longer time frame. Thanks for the great discussion Professor X and Free Ex.