様々な重心動揺指標を用いた本塾塾生の平衡機能の評価

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  • サマザマナ ジュウシン ドウヨウ シヒョウ オ モチイタ ホンジュク ケイオウ ギジュク ダイガク ジュクセイ ノ ヘイコウ キノウ ノ ヒョウカ
  • サマザマ ナ ジュウシン ドウヨウ シヒョウ オ モチイタ ホンジュク ジュクセイ ノ ヘイコウ キノウ ノ ヒョウカ
  • Samazama na jushin doyo shihyo o mochiita honjuku jukusei no heiko kino no hyoka
  • Evaluations of postural stability in Keio University studen using various measures of static posturography

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Abstract

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The present study aimed to characterize the postural stability of Kew University students using various evaluation measures of the center of the pressure (COP) fluctuations. It also aimed to investigate the association between those parameters and muscle volume of the plantar flexors, which are regarded as the major agonist muscles for postural control during quiet standing. Healthy male (n=45) and female (n=81) students from Keio University participated in the study. Subjects were requested to maintain a quiet standing on a force platform in both eyes-open and eyes-closed conditions. Various time and frequency domain measures of the COP fluctuations were calculated. Muscle volume of the plantar flexors was estimated from muscle thickness measured by ultrasonography. The results showed that some time domain measures such as mean distance (MDIST), root mean square (RMS), and mean velocity (MVELO) had higher values than those previously reported in young adults. Our results suggest the inferiority of this group of Keio University students in the postural control during quiet standing. Gender differences were found in frequency domain measures such as mean and centroidal frequencies (P0.05). Moreover, time domain measures were negatively correlated to the estimated muscle volume in both eyes-open and eyes-closed conditions in males (MDIST, R=-0.514; RMS, R=-0.519; MVELO, R=-0.466; RANGE, R=-0.470; P0.05), but not in females (MDIST, R=-0.150; RMS, R=0.150; MVELO, R=0.151; RANGE, R=0.128). Thus, muscle volume of the plantar flexors may influence time domain measures in posturography in males, but not in females. Although further investigation regarding the mechanisms of the observed gender differences is needed, we believe that this study is useful for resolving factors influencing individual differences in postural stability in healthy young adults.

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