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      Inter-joint coordination of posture on a seesaw device.

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          Abstract

          Even though specific adjustments of the multi-joint control of posture have been observed when posture is challenged, multi-joint coordination on a seesaw device has never been accurately assessed. The current study was conducted in order to investigate the multi-joint coordination when subjects were standing on either a seesaw device or on a stable surface, with the eyes open or closed. Eighteen healthy active subjects were recruited. A principal component analysis and a Self-Organizing Maps analysis were performed on the joint angles in order to detect and characterize dominant coordination patterns. Intermuscular EMG coherence was analysed in order to assess the neurophysiological mechanisms associated with these coordination patterns. The results illustrated a multi-joint organization of posture on both stable ground and on the seesaw, with a higher variability among the individual postural responses observed when standing on the seesaw. These findings challenge the classical assumption of ankle mechanisms as dominating control on seesaw devices and confirm that inter-joint coordination in postural control is strongly modulated by stance conditions. When standing on the seesaw without vision, a decrease in intermuscular coherence was observed without any impact on the joint coordination patterns, likely due to an increase dependence on proprioceptive information.

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          Author and article information

          Journal
          J Electromyogr Kinesiol
          Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology
          Elsevier BV
          1873-5711
          1050-6411
          Jun 2017
          : 34
          Affiliations
          [1 ] Laboratoire Mouvement, Equilibre, Performance, Santé (EA 4445), Département STAPS, Université de Pau & Pays de I'Adour, Tarbes, France. Electronic address: frederic.noe@univ-pau.fr.
          [2 ] Department of Teaching of Musical, Visual and Corporal Expression, University of Valencia, Valencia, Spain.
          [3 ] Laboratoire Mouvement, Equilibre, Performance, Santé (EA 4445), Département STAPS, Université de Pau & Pays de I'Adour, Tarbes, France.
          Article
          S1050-6411(16)30312-1
          10.1016/j.jelekin.2017.04.003
          28411488

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