Hip angular sway during standing with and without vibration of ankle muscles.

<p><b>(A</b>, <b>B)</b> Hip sway during standing with eyes open (EO), and eyes closed (EC), respectively. <b>(C</b>, <b>D</b>, <b>E)</b> Individual hip sway during standing with 40 Hz vibration are plotted against sway during quiet standing in participants of HY, HE, and FR groups, respectively. <b>(F</b>, <b>G</b>, <b>H)</b> Individual hip sway measured during standing with 30 Hz vibration plotted against sway during quiet standing in participants of HY, HE, and FR groups, respectively. Designations as in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0194720#pone.0194720.g003" target="_blank">Fig 3</a>.