Figure 10
From: On the cardiorespiratory coordination assessed by the photoplethysmography imaging technique
Normalized heart rates (TFRs) for (A) main + random group and (B) control group. X-axis: time [min], Y-axis: grey: time courses for individual HR, red: mean HR time courses; CPT at 14–15 min. Normalization of the heart rate allows us to better compare the physiological responses of the different subjects involved in the experiment. In the case of the experimental group, we can notice oscillations in HR throughout the experiment with a significant increase during the CPT.
