Abstract: A heat response monitor, comprises an accelerometer, a core temperature sensor, an estimation device, and an enabler. The estimation device uses accelerometry-based functionality to provide a gait-based heat stroke risk score, and the estimation device uses an estimated core temperature of a wearer of the core temperature sensor, to provide an estimated core temperature-based heat stroke risk score. The gait-based heat stroke risk score and the estimated core temperature-based heat stroke risk score are used to determine if a wearer of the heat response monitor is in risk of heat injury.