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. Author manuscript; available in PMC: 2011 May 28.
Published in final edited form as: J Biomech. 2010 Feb 24;43(8):1476–1482. doi: 10.1016/j.jbiomech.2010.01.037

Figure 6.

Figure 6

Perioral stiffness data and quadratic functions for a 68-year old male with Parkinson’s disease in the ON (with anti-PD meds) and OFF (without meds) conditions plotted relative to an age- and sex-matched healthy control.