To investigate the acupuncture sensations elicited by the Japanese style of acupuncture, penetrating acupuncture and skin-touch\nplacebo needles were randomly administered at various insertion depths (5 and 10mm for the penetrating needles and 1 and\n2mm for the placebo needles) at LI4 to 50 healthy subjects. Among the 12 acupuncture sensations in the Massachusetts General\nHospital Acupuncture Sensation Scale (MASS), ââ?¬Å?heavinessââ?¬Â was the strongest and most frequently reported sensation with the\n10mmneedles, but not with the 5mmneedles. There were no significant differences in number of sensations elicited,MASS index,\nrange of spreading, and intensity of needle pain for 5mm penetration versus 1mm skin press and 10mm penetration versus 2mm\nskin press. The MASS index with 2mm skin-touch needles was significantly larger than that with 1mm skin-touch and 5mm\npenetrating needles. The factor structures in the 12 acupuncture sensations between penetrating and skin-touch needles were\ndifferent. The acupuncture sensations obtained in this study under satisfactorily performed double-blind (practitionerââ?¬â??patient)\nconditions suggest that a slight difference in insertion depth and skin press causes significant differences in quantity and quality of\nacupuncture sensations.
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