Analgesic therapy consisted of the application of superficial thermotherapy by an infrared lamp (Infra 2000, Enraf Nonius) and TENS (TENSMED 911, Enraf Nonius). The 250-watts infrared lamp was focused at a distance of 50 cm on the cervical area for 15 minutes. TENS application employed 80 Hz frequency, 150 µs pulse duration, with 50x50 mm electrodes (Gel-Trode, Enraf Nonius) placed on the painful or metamers areas for 20 minutes.