| 摘要 |
An apparatus is described for use by an athlete during training exercise. The apparatus comprises a supply 10 of pressurised gas that consists of air with little or no oxygen, a flow regulating and limiting valve 12 for setting the rate of discharge of the gas from the supply, and a discharge pipe 14, 15, 16 for delivering a concentrated stream of the gas into the close vicinity of the athlete's nose to form a stratified region of the gas near the nose. In use, the athlete breathes in stratified streams of the gas and additional ambient air, the inhaled streams resulting in the lungs receiving a lower average oxygen concentration than the ambient air surrounding the athlete. |
