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Position and alignment of the sensing device on a subject’s thigh. (a) The wearable sensor is placed on the subject’s thigh longitudinally aligned with her femur. The sensor is tightly attached to the subject’s thigh with a Velcro strap to prevent it from sliding. The LED in the sensor is turned off when the subject is sitting; (b) and it is turned on every time a valid SiSt transition is detected.
