Thursday, August 16, 2007

Drink that coffee?

There seems to be ongoing controversy about the use of caffeine and its healthy - or not so healthy - effects. Some say that it can benefit and improve athletic performance. Others are less enthusiastic. I think the jury is still out on this one.

On Tuesday this week I O.D.'ed on a strong double espresso and felt really dizzy. That may have due to the fact that some people say that coffee can cause an insulin spike which may have knocked my blood sugar down a bit.

Any way, this article seems to indicate that caffeine has some deleterious effect on the body. This was looking at caffeine supplements - not coffee - but in any case it maybe time to cut back a bit.....

Effect of caffeine supplementation on haematological and biochemical variables in elite soccer players under physical stress conditions

Objective: To evaluate the effect of caffeine on white cell distribution and muscle injury markers in professional soccer players during exercise.

Methods: 22 male athletes completed a placebo controlled double blind test protocol to simulate a soccer match, followed by a Yo-Yo intermittent recovery test.

Results: Exercise caused an increase in packed cell volume that was enhanced by caffeine. Caffeine and exercise had a synergistic effect on the blood lymphocyte count, which increased by about 38% after exercise, and by an additional 35% when combined with caffeine. Caffeine promoted an exercise independent rise in circulating monocytes, and a synergistic action of exercise and caffeine was observed on segmented neutrophils. Caffeine promoted thrombocytosis. Plasma adenosine deaminase, aspartate aminotransferase, and lactate dehydrogenase concentrations were enhanced by exercise, and alanine transaminase concentration was enhanced in both groups, with a synergistic effect of caffeine.

Conclusions: The pronounced increase in the white cell count in the group receiving caffeine appeared to be caused by greater muscle stress and consequently more intense endothelial and muscle cell injury. The use of caffeine may augment the risk of muscle damage in athletes.

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