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O2 during
exercise
Department of Anesthesia and Division of Pulmonary and Critical Care Medicine, Mayo Clinic and Foundation, Rochester, Minnesota 55905
Received 7 July 1995; accepted in final form 22 July 1996.
Proctor, David N., and Kenneth C. Beck. Delay time
adjustments to minimize errors in breath-by-breath measurement of 
O2 during exercise.
J. Appl. Physiol. 81(6):
2495-2499, 1996.
If the delay time between gas concentration and
flow signals is not adequately corrected during breath-by-breath
analysis of expired gas, an error in calculation of oxygen consumption
(O2) will result. To
examine the frequency and delay time dependences of errors in
O2 measurement, six healthy
men exercised at 100, 200, and 250 W on a cycle ergometer while
breath-by-breath assessment of
O2 was made simultaneously
with collection of expired air. Subjects breathed first at normal rates
(15-30 breaths/min) and then at 70 breaths/min. Each subject
performed each level of exercise twice by using erroneous values for
the delay time between gas concentration and flow signals. At normal
breathing frequencies, errors in
O2 measurement were
±10% over the full range of delay times used, and the errors were
not tightly correlated with variations in delay times from optimum.
However, at 70 breaths/min, errors approached ±30% as the
variations in delay times deviated ±0.1 s from the optimal, and the
errors were highly correlated with the variations in delay times. We
conclude that there is greater potential for errors in
O2 measurement with
incorrect delay time at higher breathing frequencies. These findings
suggest that the optimal delay time for breath-by-breath systems should
be adjusted by using high breathing frequencies.
human performance; indirect calorimetry; hyperpnea; gas exchange; equipment validation; oxygen consumption
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