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Old 12-08-2011
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Question Caffeine and enhanced athlete performance!

A seasoned marathon runner drinks a cup of strong black coffee about an hour before his race to enhance his performance. By which of the following mechanisms does caffeine directly contribute to enhanced performance?
A. Allosteric activation of adenylyl cyclase
B. Allosteric activation of glycogen phosphorylase
C. Allosteric activation of hormone sensitive lipase
D. Inhibition of dephosphorylation of protein kinase A
E. Inhibition of phosphodiesterase


Any explanation will be very helpfully
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Old 12-08-2011
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Caffine like theophyline increases the cAMP level by Inhibition of phosphodiesterase.
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Old 12-08-2011
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Quote:
Originally Posted by aknz View Post
Caffine like theophyline increases the cAMP level by Inhibition of phosphodiesterase.
Although what you said makes sense caffeine also causes release of epinephrine which causes more hormone sensitive lipase action and hence the answer is C in my opinion. Also this is what wiki says.

Nevertheless good question and hopefully the correct ans is posted soon
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Old 12-08-2011
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@aknz , sorry it mentions direct effect,then you are correct.
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