Studies have shown that the same point, under different circumstances, will produce varying results. For example, Lin Hong observes that needling Neiguan (PC6) has regulating effects on normal people's pulse rate. Those with the slower pulse rate after needling sometimes experience an increase. Conversely, those with a rapid pulse find their pulse reduced after needling. The effects of Zusanli (ST36) in regulating the functions of small intestine were observed through Tan Xiao Hong's experiments. The special dual properties of these acupuncture points are also observed clinically as well: Tianshu (ST26) can effectively stop diarrhea and also treat constipation. Baihui (DU20) is used to treat both hypertension and hypotension. Sanyinjiao (SP6) can treat either excessive menstruation or amenorrhea.
Studies also show that needling even one point with a different technique will vary the results. For example, needling using the Setting the mountain on fire technique will relax and expand the capillaries in the nearby area, raising the temperature and producing a warm sensation underneath the needle. Whereas if a different technique, Penetrating-heaven coolness, is used the treatment will constrict the capillaries and lower temperature in the nearby area producing a cool sensation underneath the needle. Needling Zusanli (ST36) with tonifying technique usually decreases heart rate and relaxes blood vessels. However, needling Zusanli with a reducing method will increase heart rate and constrict blood vessels. In addition, using the Setting the mountain on fire technique will decrease the level of eosinophile granulocyte while using the Penetrating-heaven coolness technique will increase. Other methods also produce treatment results just as effectively as various needling techniques. In Shen Guo Wei's observation of chemotherapy patients, needling of Zusanli (ST36) with different techniques will yield different results. When contrasting needling, warm needling and moxibustion on Zusanli (ST36) in the treatment of vomiting, Shen found needling alone stops immediate vomiting more effectively than warm needling or moxibustion. The warm needling technique, however, has a more sustaining effect in stopping vomiting.