Figure 5
From: A Comparative Study of ECG-derived Respiration in Ambulatory Monitoring using the Single-lead ECG

Respiratory rate f(k) and cardiorespiratory parameters \(\bar{{\gamma }_{xy}}(k)\) and Tx→y(k), estimated using rth(n) and \({\widehat{r}}_{sr}(n)\) for normal activity and different respiratory events. Significant differences with respect to normal activity are indicated by *.