Originally Posted by frettish
I read that Caffine isn't that great for cardio work outs.
Bronkaid? Hmm. I will have to check it out.
As far as what's wrong with Ephedra? I don't know. I loved the old formula Xenadrine and the results I got from it, hence this post.
Caffine is good for cardio, that's why it is considered an ergogenic.
Caffeine is a stimulant that has well documented ergogenic effects.
It has been shown to decrease marathon run times and cycling time trials. Caffeine affects the body in several different ways. One way caffeine improves performance is by affecting the central nervous system causing increased neuronal excitability, consequently reducing reaction time. Another theory is that caffeine increases free fatty acid oxidation so that fatty acids are used for energy in place of glycogen (your body's main source of energy that is used during exercise). This allows glycogen levels to be maintained for a longer period of time, allowing you to ride longer.
Caffeine research has shown that consuming 3 to 6 milligrams of caffeine per kilogram body weight (or about 1.4-2.7 mg of caffeine per pound) can improve endurance by 20% to 50% without raising urinary caffeine levels above the International Olympic Committee limit of 1200 mg. Therefore, a 175 pound man will need 245 to 472 mg of caffeine. This level can be obtained by drinking 24 ounces of tea or 2 cups of coffee.