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- W2271113382 abstract "Proctor, David N., and Kenneth C. Beck. Delay time adjustments to minimize errors in breath-by-breath measurement ofV˙o 2 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 (V˙o 2 ) will result. To examine the frequency and delay time dependences of errors inV˙o 2 measurement, six healthy men exercised at 100, 200, and 250 W on a cycle ergometer while breath-by-breath assessment ofV˙o 2 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 inV˙o 2 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 inV˙o 2 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." @default.
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- W2271113382 date "1996-12-01" @default.
- W2271113382 modified "2023-09-23" @default.
- W2271113382 title "Delay time adjustments to minimize errors in breath-by-breath measurement of V˙<scp>o</scp><sub>2</sub>during exercise" @default.
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- W2271113382 doi "https://doi.org/10.1152/jappl.1996.81.6.2495" @default.
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