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(a) ECG leads and Polar OH1 arm sensor placement on the participant. (b) The ECG leads connected to the g.Nautilus device. RA and LL are connected to two detachable electrodes, while LA is connected to the reference (REF) channel of the g.Nautilus. (c) The Polar OH1 sensor on the temple is secured by a sweatband. RA: Right arm electrode, LA: Left arm electrode, LL: Lower left chest electrode.
