Introduction
In recent years, resistance training has become increasingly popular. Training methods typically involve lifting some sort of weight, such as barbells, dumbbells, and pulleys. This type of training focuses primarily on counteracting the force of gravity. In contrast, flywheel training, also known as inertial training, uses the inertia of the flywheel to provide resistance during the concentric (muscle shortening) and eccentric (muscle lengthening) phases of movement. Recent literature using inertial flywheel resistance training has shown that strength, power and performance, such as the vertical jump and the first 5 m of the sprint test, are usually significantly improved after 4–8 weeks of flywheel trainingCaffeine consumption is widespread, with approximately 90% of adults consuming some form of caffeine in their diet and approximately 30–60% of athletes consuming caffeine as a sports supplementHowever, it is still unclear whether caffeinated chewing gum supplementation can improve the performance of the Romanian deadlift on a flywheel. Therefore, the aim of this study was to investigate the effect of a caffeinated chewing gum supplementation on the performance of the Romanian deadlift on a flywheel training device.