System and a method wherein a wearable device receives sensor data at a wearable device and compares a first value determined from the sensor data with a second value determined from the sensor data to determine a percentage change in the sensor data from the first sample to the second sample. The system and method may also change a sampling frequency of the sensor at the wearable device according to one or more settings that were set by a user of the wearable device. The system and method optimizes power consumption while optimally recording data sensed by one or more sensors at a wearable device.