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Muscle Power Measured A new method measures human muscle strength without implants, using ultra-wideband radar attached to the skin. This is crucial for exoskeletons, robotic prosthetics, and rehabilitation, as these systems must accurately know the force a person is trying to apply. Previously, precise measurements required implanting sensors directly into muscle tissue, making widespread use impossible. The small radar antenna sends short electromagnetic pulses into the muscle and analyzes the reflected signal. As the muscle contracts, its electromagnetic properties change, and the radar detects these changes, allowing strength assessment without surgery. However, there is a technical drawback - measurements occur with a slight delay, and scientists are working to accelerate processing to real-time for instant exoskeleton response. In rehabilitation, electrical muscle stimulation is often used, but without precise sensors, it's easy to cause overexertion or tissue damage, as the doctor can't see how hard the muscle is working. Radar sensors can solve this problem, making therapy safer. In sports, such sensors will help determine the exact moment when it's safe to return to training after an injury, as reported in Science Robotics, 2023. 🔗 Read original →