I was wondering (in the case that this topic hasn't been raised on this forum before) about retaining needles. In classic texts such as the Systematic Classic of Acupuncture and Moxibustion (jia yi jing), retention times are given as a measure of breaths and seem to indicate that needles are to be retained for one minute at the very most.
Could any acupuncture historians out there care to shed light on when and why acupuncturists started retaining needles for 20+min as many of us have been instructed through modern TCM teachings?
John Macdonald touched on this topic in another discussion but I was wondering if anyone could elaborate.
"Ideas, or, lack of them, can cause disease." - Kurt Vonnegut Jr