Abstract.
A new method was developed for continuous isotopic estimation of human whole body
CO2 rate of appearance (Ra) during non-steady state exercise. The technique consisted
of a breath-by-breath measurement of 13CO2 enrichment (E) and a real-time fuzzy logic feedback system which controlled NaH13CO3 infusion rate to achieve an isotopic steady state. Ra was estimated from the isotope
infusion rate and body 13CO2 enrichment which was equal to E at the isotopic steady state. During a non-steady
state incremental cycle exercise (5 w/min or 10 w/min), NaH13CO3 infusion rate was successfully increased by the action of feedback controller so
as to keep E constant.
Keywords:
NaH
13CO
3
- Fuzzy Logic Controller