Abstract
Three types of constant work load ergometer for clinical use were worked up using DC-generators. Type A has a voltage control circuit to stabilize the output voltage of the generator and can impose the work load of 25-200 watts. Type B is an improved one the load current of which is controlled by comparing the multiplied value of the torque by the number of revolutions with the standard voltage. An accuracy of ±2% was obtained. Experimental results using a type B ergometer suggest that the crank diameter of 36cm is favourable for Japanese subjects. Type C ergometer was manufactured in order to investigate the inertia effect. A greater inertia of 1.15×10-2kg·m·sec2 proved to result in less deviation of the revolution speed and the heart rate increase was the same as in case of pedalling with less inertia.
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