Training masks

There is some evidence that they may improve endurance capacity (VO2 max) and power output, but research into their benefits has so far generally proven inconclusive.

Originally designed to simulate training at altitude, the concept failed to deliver in multiple research trials.

However, they appear to add resistance to the respiratory muscles by limiting air supply, thus triggering an adaptive physiological response.

[4] Training masks allow athletes to strengthen their respiratory muscle fitness without having to be confined to stationary devices or special facilities.

By restricting the user's breathing, the devices may improve cardiorespiratory fitness, leading to better sport performance.