Development of On-line Measurement System for Aerobic and Anaerobic Work Capacity
【Supercategory：7. DESCENTE SPORTS SCIENCE Subcategory：7.4 Vol.4】
A new system for continuous and automatic measurement of O₂ uptake using mini-computer system was developed.
Pulmonary ventilation was measured by the piston type spirometer with rotary-encoder to detect the displacement of the piston which is proportional to the volume changes. Electric pulse generated from the rotary-encoder was integrated with electric counter and transfered to the computer system. O₂ and CO₂ concentrations in the expired gas were determined with O₂ gas analyzer using zirconium sensor and infrared type CO₂ gas analyzer and analog signals from O₂ and CO₂ gas analyzer were inputed to the computer system using A-D converter. O₂ uptake, pulmonary ventilation, CO₂ output, R. Q. etc. were calculated by the computer system.
Accuracy and reliability of the new system were examined comparing with the Douglas bag method. It was found that the difference in O₂ uptake obtained by the new system and the Douglas bag method was less than 5% to the extent of 150l/min of ventilation and 3.5l/min of O₂ uptake.
Main factor of the error depended on the difference of O₂ concentration measured by the Douglas bag method and the new system using mixing chamber. In order to obtain higher accuracy, it will be necessary to improve the mixing chamber.
DESCENTE SPORTS SCIENCE Vol.16/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE
Pulmonary ventilation was measured by the piston type spirometer with rotary-encoder to detect the displacement of the piston which is proportional to the volume changes. Electric pulse generated from the rotary-encoder was integrated with electric counter and transfered to the computer system. O₂ and CO₂ concentrations in the expired gas were determined with O₂ gas analyzer using zirconium sensor and infrared type CO₂ gas analyzer and analog signals from O₂ and CO₂ gas analyzer were inputed to the computer system using A-D converter. O₂ uptake, pulmonary ventilation, CO₂ output, R. Q. etc. were calculated by the computer system.
Accuracy and reliability of the new system were examined comparing with the Douglas bag method. It was found that the difference in O₂ uptake obtained by the new system and the Douglas bag method was less than 5% to the extent of 150l/min of ventilation and 3.5l/min of O₂ uptake.
Main factor of the error depended on the difference of O₂ concentration measured by the Douglas bag method and the new system using mixing chamber. In order to obtain higher accuracy, it will be necessary to improve the mixing chamber.
DESCENTE SPORTS SCIENCE Vol.16/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE
| Researcher | Yasuo Ikegami*1, Miharu Miyamura*1, Hideji Matsui*1, Mitsuru Saito*2 |
|---|---|
| University or institution | *1 Nagoya University, *2 Toyota Technological Institute |
Keywords
On-line Measurement System, Aerobic, Anaerobic Work, O₂ uptake, the Douglas bag method