Figure 4
From: An in vitro assay of collagen fiber alignment by acupuncture needle rotation
Revolutions to failure (average +/- standard error) during in vitro acupuncture. The number of revolutions before gel tearing was identified from alignment area curves and verified visually from the image sets. Crosslinking the collagen significantly decreased the ability of the collagen gels to withstand needle rotation without tearing (*, 2-way ANOVA, P < 0.001), whereas changing the collagen concentration had no effect (P = 0.274)