Electromyography (EMG) sensing technology and nerve conduction studies have a long history of success in diagnosing neurological disorders. Now with the advent of wearable EMG devices, these muscle sensors are finding success in other applications such as robot control, augmented reality, athletic performance training, and biofeedback.
The following sample of articles from around the web shows the diversity of practical applications for wearable muscle sensors (often demonstrated originally with older wired-style EMG sensors).