A system for power gating for a wearable sensor, the system comprising: a power supply ; a Near Field Communication, NFC, antenna to receive NFC signals; characterized in that the system further comprises: a Radio Frequency, RF, rectifier electrically coupled to the NFC antenna to generate a current based on a first signal received from the NFC antenna; an electronic switch coupled between the power supply and a sensor to control electrical connection between the power supply and the sensor, wherein the RF rectifier is further coupled to the electronic switch to apply the current to the electronic switch to change a state of the electronic switch; a processor , wherein the electronic switch is further coupled between the power supply and the processor, wherein the processor is coupled to the sensor to receive sensor data from the sensor when the switch is closed; a memory coupled to the processor and configured to store the sensor data; and a network interface coupled to the processor, the processor being configured to transmit, in response to a second NFC signal, the sensor data stored in the memory to a remote device using the network interface. a power supply ; a Near Field Communication, NFC, antenna to receive NFC signals; characterized in that the system further comprises: a Radio Frequency, RF, rectifier electrically coupled to the NFC antenna to generate a current based on a first signal received from the NFC antenna; an electronic switch coupled between the power supply and a sensor to control electrical connection between the power supply and the sensor, wherein the RF rectifier is further coupled to the electronic switch to apply the current to the electronic switch to change a state of the electronic switch; a processor , wherein the electronic switch is further coupled between the power supply and the processor, wherein the processor is coupled to the sensor to receive sensor data from the sensor when the switch is closed; a memory coupled to the processor and configured to store the sensor data; and a network interface coupled to the processor, the processor being configured to transmit, in response to a second NFC signal, the sensor data stored in the memory to a remote device using the network interface. a Radio Frequency, RF, rectifier electrically coupled to the NFC antenna to generate a current based on a first signal received from the NFC antenna; an electronic switch coupled between the power supply and a sensor to control electrical connection between the power supply and the sensor, wherein the RF rectifier is further coupled to the electronic switch to apply the current to the electronic switch to change a state of the electronic switch; a processor , wherein the electronic switch is further coupled between the power supply and the processor, wherein the processor is coupled to the sensor to receive sensor data from the sensor when the switch is closed; a memory coupled to the processor and configured to store the sensor data; and a network interface coupled to the processor, the processor being configured to transmit, in response to a second NFC signal, the sensor data stored in the memory to a remote device using the network interface. <EOS>