[Discussion on the temperature characteristic of silver needle in the human body during the warm needling].

To observe the temperature change of traditional silver needle in the human body during the burning of moxa ball.Thirty-six healthy volunteers were randomly divided into a single-needle group and a multi-needle group, 18 cases in each group. For both groups, one silver needle (18 cm in length, 1.1 mm in diameter), which was adopted in this research to measure the temperature change, was punctured in the insertion point of the volunteer (inside the top of the left buttock, 7 cm under the edge of the highest point of the iliac crest, 7 cm lateral to the dorsomedian line), then another four silver needles were punctured 2 cm respectively anterior, posterior and lateral to the insertion point in the multi-needle group, and all the silver needles were inserted with 6 cm depth. Afterigniting the 1.3 g moxa ball on the needle tail, the temperature of the measuring points that were 3 mm, 33 mm, and 63 mm above the silver needle tip were recorded separately by digital temperature measuring instrument.The peak temperature of the three measuring points in the single-needle group was all around 41 degrees C, while those in the multi-needle group were around 43 degrees C, which had significant differences (all P < 0.05), but no significant differences among the highest temperature of the measuring points in the same group could be found (all P > 0.05). The highest temperature of moxa ball in the single needle group was (611.16 +/- 6.91) degrees C, while that of the central moxa ball in the multi-needle group was (628.94 +/- 8.99) degrees C, the difference of which was significant difference (P < 0.01).The temperature conductivity of the silver needle is very well, so the heat of the moxa ball could pass from the tail of needle to the tip during the warming treatment. The peak temperature on the body, tip of the silver needle in the multi-needle group is higher than those in the single needle group. Also, the peak temperature of multi-moxa ball is higher than that of single moxa ball.