視覺與表皮感覺對穩定站立姿勢的影響

背景與目的：來自食指輕觸的表皮感覺與視覺皆能提供身體與環境間之相對關係，但仍無證據指出此兩種不同訊息對站姿控制是否具有相互干擾的效應。故本篇探討當視覺提供不同姿勢控制回饋訊息時，以食指輕觸穩定站姿的效果是否會受到影響？方法：共徵召二十位健康受試者，使其在光亮環境，及黑暗環境中有或無一固定於頭上之光點等情況下向前看，以分別獲得正確、固定或無視覺回饋，其中一半的試驗中受試者以食指輕觸於一物體來獲得表皮感覺輸入。在此六種情況下，請受試者皆維持雙腳併攏站立於力板上25秒。結果：根據多變數分析結果，食指輕觸可顯著減少足底壓力中心在水平面上移動總面積與總軌跡長、在前後及左右向平均瞬時移動速率與範圍；而視覺則會影響足底壓力中心移動總面積與總軌跡長、及左右向移動速率與範圍，但不影響前後向移動速率與範圍。至於視覺與表皮覺則無顯著交互作用。結論：食指輕觸能有效地穩定站姿，且不受視覺輸入所影響。此外，兩者雖提供相同訊息，但中樞系統傾向優先利用來自食指輕觸之感覺訊息來穩定站姿。

關鍵字

視覺；表皮感覺；食指輕觸；姿勢控制

並列摘要

Background and Purposes: Different types of sensory inputs can be used simultaneously to regulate postural stability. However, how different inputs that convey similar information for postural control, such as visual and cutaneous, would affect each other is unknown. This study sought to determine how visual inputs and cutaneous inputs from fingertip contact would affect postural stability. Methods: Twenty healthy young adults participated in the study and stood with the feet together on a force platform with eyes open in lighted room (normal, NORM), in darkness (deprived, DPRV), and in darkness with a light fixated onto the head (fixed, FIXD), first without and then with fingertip contact (FC). The variables of interest were center of pressure in the anterior-posterior (AP) and medial-lateral (ML) directions. Results: Vision and FC each was found to have significant main effect, but not interaction. Significantly smaller postural sway was found in FC than without FC. NORM and FIXD had significantly smaller sway trajectory, velocity, and range in the ML but not the AP direction, than DRPV. Conclusions: These findings confirmed the effect of FC in stabilizing standing posture, and demonstrated that this effect was not affected by visual inputs. The effect of visual inputs however, was directionspecific, having a greater effect on the direction that was more challenged, i.e. ML in feettogether standing. What is more, fixed visual inputs, although inaccurate in reflecting postural sway, helped to improve postural stability, suggesting that the role of visual inputs may not necessarily be confined to providing information regarding the relationships between the body and the environment.

並列關鍵字

Vision ； Cutaneous sensation ； Fingertip contact ； Postural control

國際替代計量

視覺與表皮感覺對穩定站立姿勢的影響

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