Caffeinated gum: a game changer for volleyball?

This study looked at whether chewing caffeinated gum can improve volleyball performance in trained female players. Eleven healthy athletes took part in three sessions: one with placebo gum, one with a single 300 mg dose of caffeine gum, and one with three 100 mg doses spaced out. Researchers measured attack, block, and defense efficiency, as well as jump height and heart rate, during a volleyball-specific game.