Figure 1. EMFi force sensitive sensors were attached on the neck (sensor size 15 cm x 2 cm) near carotid artery and on the ankle near femoral artery (sensor size 10 cm x 2 cm). Additionally, the subject was sitting on a chair with a 42 cm x 36 cm EMFi sensor on the seat. The signals from top to down are ankle signal, carotid pulse, BCG and ECG. Before the measurement the subject had some hypertension (162/98 mmHg, pulse 65 bpm). The signals were band pass filtered with a FIR filter with a pass band 0.5-30 Hz. The x axis is time in seconds. The y axis is in arbitrary units as we did not try to calibrate this measurement.
Figure 2. The same signals as in Figure 1 but here recorded after the sauna bath. The waveforms have changed and the I-J amplitude of the BCG has increased markedly. Blood pressure had decreased to 141/80 mmHg with pulse 80 bpm.