Table 2.
Wearable sensors used in stress detection.
| Type of Signal | Commercialized Wearable Sensors Used in Relevant Research | Wearable Sensors Not Yet Commercialized but Used in Relevant Research |
|---|---|---|
| Heart activity | Empatica E4 wrist band, AutoSense, Cardiosport TP3, Wahoo chest belt, BioHarness 3 | |
| Brain activity | MindWave mobile EEG headset | Device 1, Device 2 |
| Muscle activity | DataLOG | Device 3 |
| Electrodermal activity | Empatica E4 wrist band, BN-PPGED, Q-sensor, Shimmer sensor | |
| Respiratory | AutoSense, SleepSense | |
| Blood volume pulse/pulse plethysmograph | Empatica E4 wrist band, BN-PPGED | |
| Body/skin temperature | Empatica E4 wrist band, AutoSense | |
| Three-axis accelerometer data | Empatica E4 wrist band, Q-sensor |
Notes: Empatica E4 wrist band is used in [80,81,82,83]; AutoSense is used in [84,85,86]; SleepSense is used in [87,88]; BN-PPGED is used in [89]; Cardiosport TP3 is used in [90]; Q-sensor is used in [70]; Wahoo chest belt is used in [91]; BioHarness 3, Shimmer sensor, and MindWave mobile EEG headset are being used as an integrated system for stress monitoring in [92]; DataLOG is used in [93]; Device 1 is a EEG wearable sensor developed in Online Predictive Tools for Intervention in Mental Illness (PTIMI) project funded by European Union [94]; Device 2 is a noninvasive physiological sensor for stress assessment presented in [95]; Device 3 is used in [96] which they collect the EMG signals of the left trapezius muscle and then remove the contained ECG signal components.