Fig. 8. Flexible and stretchable wearable devices for health care applications developed by different groups: (a) multifunctional epidermal electronic device for electrophysiological, temperature, and strain monitoring [4]; (b) a flexible capacitive pressure sensor for radial artery pressure pulse measurement [112]; (c) e-skin with pressure and thermal sensors [113]; (d) a bandage strain sensor for breathing monitoring [58]; (e) electrochemical tattoo biosensors for real-time noninvasive lactate monitoring in human perspiration [116].
