COM linear displacements during standing with and without vibration of ankle muscles.

<p><b>(A</b>, <b>B)</b> COM anterio-posterior (AP) displacements during standing with eyes open (EO), and eyes closed (EC), respectively. <b>(C</b>, <b>D</b>, <b>E)</b> Individual AP displacements during standing with 40 Hz vibration plotted against displacements during quiet standing in participants of HY, HE, and FR groups, respectively. <b>(F</b>, <b>G</b>, <b>H)</b> Individual AP displacements during standing with 30 Hz vibration plotted against displacements during quiet standing in participants of HY, HE, and FR groups, respectively. <b>(I</b>, <b>J)</b> COM medio-lateral (ML) displacements during standing with eyes open (EO), and eyes closed (EC), respectively. <b>(K</b>, <b>L</b>, <b>M)</b> Individual ML displacements during standing with 40 Hz vibration plotted against displacements during quiet standing in participants of HY, HE, and FR groups, respectively. <b>(N</b>, <b>O</b>, <b>P)</b> Individual ML displacements during standing with 30 Hz vibration plotted against displacements 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>.