0.5g to 1.0g.
According to multiple studies and test data, the total acceleration threshold for falls is approximately between 0.5g and 1.0g. This refers to the sum of the body's acceleration and the ground acceleration when falling, which is usually recorded and measured by sensors. Research shows that a total acceleration exceeding 1.0g may cause serious injuries such as fractures. Among the elderly, falls are a common accident with serious consequences. Therefore, fall detection and protection technologies have received widespread attention.
Currently, fall detection and early warning technology has been used in some smart wearable devices, rehabilitation assistive devices and medical monitoring systems. By measuring and judging the total acceleration and direction of a fall, these devices can promptly activate early warning and self-rescue mechanisms, effectively reducing the risk of falls and injury rates.