| 摘要 |
A portable system for the measurement of the metabolic parameters of an individual, athlete or patient, in real conditions of physical activity, using a "breath by breath" technique. The portable system includes a portable unit (1) that has a reduced weight and dimensions, and is fixed to the body of the individual by means of an anatomic harness (2) during the test, a turbine flowmeter (3-4-8) applied at the mouth of the individual through an anatomic face mask (6-7-8), a heart rate monitor belt (10), a rechargeable battery (11) for supplying the system, and a receiver unit (12) that is connected to a personal computer (14) by RS232 connection (13), allowing the receipt and display of the measurement in real time on the screen.The portable unit includes a fast CO2 analyzer, an intrinsically slow oxygen analyzer, whose output signal is elaborated in order to obtain a response time short enough to allow the accurate measurements on a "breath by breath" basis, a microprocessor, a memory for data storage, a UHF transmitter, an LCD display, and a keyboard.The receiver unit includes a UHF receiver module and an interface for the connection to the personal computer.The flowmeter is a bidirectional turbine (3) and an optoelectronic reader that, based on the infrared interruption technique, detects the rotations of a blade and consequently the volumes ventilated by the individual.
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