Table 1.

Procedure used for the painful stimulation and acupuncture conditions

	Painful stimulation	Acupuncture
Location	non-meridian points (2–3 cm away from ST36)	ST36
Needle gauge	0.3 mm in diameter and 40 mm in length	0.3 mm in diameter and 40 mm in length
Needle insertion depth	under the skin 30 mm	under the skin 30 mm
Insert direction	vertically	vertically