On Deriving Tidal Volume From Electrocardiogram During Maximal Effort Test

Electrocardiogram-derived respiration (EDR) is a well known method for obtaining respiratory signal estimations only from electrocardiogram (ECG). It has been extensively employed for deriving respiratory rate, whereas much less results concerning tidal volume (TV) estimation have been reported in the literature. In this work, a method for estimating TV from ECG during a maximal effort treadmill test is presented. It is based on the R-S amplitude series and a calibration process of a linear model. The test was divided in stages, and lowest estimation error was obtained for lead V4, with a median relative error as low as 7% in the best-performing stage and lower than 14% in most of them, suggesting that TV can be estimated from the ECG.