In the moxibustion group , the time of pain relief was shorter than that of the far-infrared therapy group [ ( 11.5 + / - 3.9 ) min vs ( 17.8 + / - 3.8 ) min on the 1st day ; ( 9.4 + / - 3.6 ) min vs ( 15.2 + / - 4.3 ) min on the 2nd day ; ( 7.8 + / - 2.7 ) min vs ( 14.3 + / - 3.2 ) min on the 3rd day ; ( 6.4 + / - 3.3 ) min vs ( 10.5 + / - 2.9 ) min on the 4th day ; ( 5.9 + / - 2.9 ) min vs ( 11.2 + / - 1.9 ) min on the 5th day ; ( 5.3 + / - 2.2 ) min vs ( 8.8 + / - 2.3 ) min on the 6th day ; ( 5.4 + / - 1.8 ) min vs ( 9.2 + / - 2.1 ) min on the 7th day ; ( 5.1 + / - 1.4 ) min vs ( 9.5 + / - 2.6 ) min on the 8th day , all P < 0.05 ] .