Wearable sensors are compact electronic devices integrated into items such as watches, patches, textiles and shoes to monitor physiological and environmental signals continuously during daily life. Recent research focuses on making these systems more accurate, comfortable and energy efficient while capturing complex health and activity information.

On the materials side, flexible and stretchable substrates, conductive inks and nanomaterials allow sensors to conform to skin and fabric. This supports long term measurement of heart rate, respiration, body temperature, motion, sweat composition and even electrophysiological signals such as ECG and EMG. Researchers are working to improve biocompatibility, durability under repeated bending and resistance to sweat and washing.

Data acquisition and processing are central challenges. Multi sensor platforms often combine accelerometers, gyroscopes, optical sensors, electrodes and chemical sensors. Embedded algorithms filter noise, correct motion artifacts and extract features related to sleep, posture, gait, fatigue and stress. There is growing use of machine learning to recognize activities and detect anomalies linked to disease onset or injury risk.

Energy management is another key theme. Studies explore low power electronics, duty cycling, compressed sensing and on device analysis to reduce wireless transmission demands. Some prototypes harvest energy from motion, heat or light to extend operating life.

Applications span healthcare, sports, occupational safety and rehabilitation. Clinical uses include remote monitoring of chronic conditions, early detection of arrhythmias, tracking of recovery after surgery and personalized feedback for medication or exercise. Research also examines privacy, data security and user adherence, emphasizing designs that are unobtrusive, reliable and easy to integrate into everyday routines.