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. 2018 Aug 2;84(Suppl 1):30–45. doi: 10.1038/s41390-018-0080-2

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© The Author(s) 2018

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Fig. 11 — Left ventricle rotational mechanics. a Basal rotation occurs in a clockwise direction (negative) and b Apical rotation occurs in an anti-clockwise direction (positive). c The net effect of the opposing rotations is called Twist. d The speed at which twist occurs is called twist rate (LVTR) and the speed at which untwist occurs is called untwist rate (LVUTR)