Influences of Head Orientation on the Unperturbed Postural Sway in Human Upright Stance
-
- Tanaka Hideyuki
- Department of Human-Computer Interaction Science, Tokyo University of Agriculture and Technology
-
- Uetake Teruo
- Department of Eco-design, Tokyo University of Agriculture and Technology
この論文をさがす
説明
We examined the effects of head orientation on postural sway during quiet upright standing. Twenty healthy male subjects with diverse balance abilities were included in this study. Postural sway was estimated using an instrumented force platform to record the center-of-pressure (COP) under a subject’s feet during standing. The subjects were tested with the ‘head straight’ (normal) and with the ‘head back’ (I.e., neck extension), both conditions with eyes-open. The COP trajectories were analyzed using a technique of statistical mechanics, better known as stabilogram-diffusion analysis, proposed by Collins and De Luca (1993). The extracted parameters were the effective diffusion coefficients (D) for the short-term (less than approximately 1.0 s) and the long-term (longer than 1.0 s) intervals, respectively, as well as the Hurst exponents (H) for each of the short- and long-term intervals, and some critical point coordinates (I.e., critical mean square displacements and critical time intervals). The short-term D, short-term H, and critical mean square displacements were significantly larger with the head back condition than with the head straight condition. No significant effects of head orientation were found in the long-term D and H or in the critical time intervals. That is, head back or neck extension caused an increase in the stochastic activity and positively correlated (persistent) behavior of the COP during shorter timescales. These results suggest that head backward orientation influences the open-loop (I.e., short-term) control mechanisms, but not the corrective feedback (I.e., long-term) mechanisms used to maintain postural stability.
収録刊行物
-
- Anthropological Science
-
Anthropological Science 111 (3), 333-345, 2003
一班社団法人 日本人類学会
- Tweet
詳細情報 詳細情報について
-
- CRID
- 1390282679287232256
-
- NII論文ID
- 10011217775
-
- NII書誌ID
- AA11307827
-
- ISSN
- 13488570
- 09187960
-
- NDL書誌ID
- 6610617
-
- 本文言語コード
- en
-
- データソース種別
-
- JaLC
- NDL
- Crossref
- CiNii Articles
-
- 抄録ライセンスフラグ
- 使用不可