Interferential treatment with modified beat frequency

A method of interferential treatment, comprising

• applying electrodes to a patient and delivering a first range of beat frequencies to the electrodes, measuring a first indicator of autonomic nervous system activity and determining a level of autonomic nervous system activity in the first range of beat frequencies;
• modifying the level of autonomic nervous system activity by adjusting the beat frequency range to overlay the first range of beat frequencies;
• and
• measuring a second different indicator of autonomic nervous system activity.

A device configured to deliver an electrical interferential treatment, comprising

• a series of electrodes configured to be applied to a patient;
• and
• a system configured to deliver beat frequencies in a first range through the electrodes;
• the system being configured to measure a first indicator of autonomic nervous system activity and thereby determine a level of autonomic nervous system activity in the first range of beat frequencies;
• the system being configured to deliver a beat frequency in a second range of beat frequencies overlaying the first range of beat frequencies as measured by the second indicator;
• and
• the system being configured to measure a second different indicator of autonomic nervous system activity during the delivery of the second range of beat frequencies.