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2. What does pre-workout do and is it really effective? Know the ...

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   Pre-workout may contain vitamins, creatine and caffeine. Is it worth trying?

3. Pre-workout - Wikipedia

   en.wikipedia.org/wiki/Pre-workout

   Caffeine is now one of the most common ingredients, found in one study to be in 86% of the bestselling pre-workout supplements. [3] Caffeine works with the central nervous system to increase the blood flow. [13] Caffeine is a popular ingredient in pre-workout because it increases alertness, mental concentration, and energy. [14]

4. Heart Disease: Does Too Much Caffeine Cause High Blood Pressure?

   www.aol.com/lifestyle/heart-disease-does-too...

   Researchers say consuming more than 400 milligrams of caffeine per day could raise the risk of cardiovascular disease. Excessive caffeine from coffee, tea, energy drinks, and other beverages may ...

5. Caffeine - Wikipedia

   en.wikipedia.org/wiki/Caffeine

   Caffeine increases intraocular pressure in those with glaucoma but does not appear to affect normal individuals. [134] The DSM-5 also includes other caffeine-induced disorders consisting of caffeine-induced anxiety disorder, caffeine-induced sleep disorder and unspecified caffeine-related disorders.

6. Caffeine dependence - Wikipedia

   en.wikipedia.org/wiki/Caffeine_dependence

   Caffeine dependence can cause a host of physiological effects if caffeine consumption is not maintained. Withdrawal symptoms may include headaches, fatigue, difficulty concentrating, lack of motivation, mood swings, nausea, insomnia, dizziness, cardiac issues, hypertension, anxiety, backaches, and joint pain; these can range in severity from mild to severe. [18]

7. Performance Anxiety: Causes & How to Overcome Them - AOL

   www.aol.com/performance-anxiety-causes-overcome...

   Beet juice may also affect blood pressure. If you have high blood pressure (hypertension), foods that are high in nitrates like beets and beet juice can lower your blood pressure. ... Caffeine may ...

8. Adenosine receptor - Wikipedia

   en.wikipedia.org/wiki/Adenosine_receptor

   Caffeine keeps you awake by blocking adenosine receptors. Each type of adenosine receptor has different functions, although with some overlap. [3] For instance, both A 1 receptors and A 2A play roles in the heart, regulating myocardial oxygen consumption and coronary blood flow, while the A 2A receptor also has broader anti-inflammatory effects throughout the body. [4]

9. Does Creatine Live Up to the Hype? We Asked the Experts - AOL

   www.aol.com/lifestyle/does-creatine-live-hype...

   Creatine is a popular supplement linked to a range of health benefits. It’s often used to help boost athletic performance. Experts explain the uses and risks.