#$%^&*AU2017272184A120180621.pdf#####ABSTRACT Technology disclosed herein relates to monitoring of effects relevant to head impacts and/or injuries in humans. Embodiments of the invention have been particularly developed for enabling real-time monitoring of head impact data for participants in contact sports systems. This finds application, for example, in the context of managing brain injury risks in the context of sporting activities.5/12 300 Mouthguard Sensor acquires measurements 302 Measurements transmitted to body-worn device 303 FBody-worn device transmits measurements to sideline Laptop, tablet or phone receives 304 measurements, processses them and displays results to coach, trainer or doctor FIG. 3A6/12 310 311 Mouthguard Sensor acquires measurements 312 Measurements transmitted to body-worn device 313 Body-worn device processes data Body-worn device transmits 314 summarised or compressed data to the sideline Laptop, tablet or phone receives 315 data, (optionally) further processses it and displays results to coach, trainer or doctor FIG. 3B