| 摘要 |
<p>An inspiratory muscle training device comprises a chamber (29) having an opening (27) for the passage of air to be inhaled and exhaled and an inlet permitting air to be inhaled to enter the chamber and to pass to the opening. A one-way exhaust valve permits exhaled air entering through the opening to escape from the chamber. Means such as a valve (1; 103) is provided to resist the entry of air to be inhaled into the chamber. The means (1; 103) to resist the entry of air includes means (3, 7, 9; 113, 115) to vary the degree of resistance in dependence upon the volume of air that has passed through the inlet.</p> |
