A new system for continuous measurement of oxygen uptake by means of telemeter was developed. Oxygen uptake and pulmonary ventilation during rest and exercise was determined using portable oxygen consumption meter (Oxylog, Morgan, England).
　The subject wears a face mask, with inspiratory and expiratory valves, to which is attached a turbine type flow meter to measure inspiratory volume. The oxygen difference between the inspired and expired air was measured by two oxygen electrodes in instrument. From the flow and oxygen difference thus obtained, volume of oxygen extracted from air was calculated by microcomputer.
　An analog signals from the oxylog were transfered to interface in order to digitize using a A-D converter. A FM type telemeter system (model 271, NEC Sanei, Japan) with 76.47 MHz was used to transmit the digital signal.
　The signal from receiver was demodulated and the data of oxygen uptake and pulmonary ventilation were printed out by the printer. Oxygen uptake during sports activities were determined continuously by the telemetory system developed in this study.
　It was found that peak values of energy expenditure during tennis and badminton games were 0.172 and 0.12 kcal/kg/min, respectively.

DESCENTE SPORTS SCIENCE Vol.8/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE