Fig. 9: Applications of three wearable device types.
a Smart photoplethysmography (PPG) watch monitoring physiological signals such as heart rate and blood oxygen, reprinted/adapted with permission from ref. 160. b Myo motion armband capturing acceleration, angular velocity, and electromyography (EMG) signals, reprinted/adapted with permission from ref. 97. c Smart shoe analyzing plantar pressure variations to predict gait postur, reprinted/adapted with permission from161. d Interactive fiber-based apparel for fabric-integrated motion monitoring, respiration tracking, and energy harvesting, reprinted/adapted with permission from ref. 162. e Smart textile glove detecting joint angles and pressure to estimate complex gestures, reprinted/adapted with permission from ref. 104. f Full-texture dual-tactile (pressure/tension) motion suit for monitoring joint stress-strain relationships, reprinted/adapted with permission from ref. 163. g Spray-on electrode tattoo capturing electrophysiological signals including EMG and electrocardiography (ECG), reprinted/adapted with permission from ref. 164. h Cellulose aerogel electronic skin for motion monitoring, thermotherapy, and temperature control, reprinted/adapted with permission from ref. 165. i Ultrathin self-powered PPG sensor for wearable real-time health monitoring, reprinted/adapted with permission from ref. 166.
