Wang Junsig, Gillette Jason C
Department of Orthopaedic Surgery, University of Arizona, Tucson, AZ, USA.
Department of Kinesiology, Iowa State University, Ames, IA, USA.
Gait Posture. 2018 Sep;65:39-44. doi: 10.1016/j.gaitpost.2018.06.173. Epub 2018 Jun 30.
Individuals often carry asymmetric loads over challenging surfaces such as uneven or irregular terrain, which may require a higher demand for postural control than walking on an even surface.
The purpose of this study was to assess postural stability in the medial-lateral (ML) direction while carrying unilateral versus bilateral loads when walking on even versus uneven surfaces.
Nineteen healthy young adults walked on even and uneven surface treadmills under three load conditions: no load, 20% body weight (BW) bilateral load, and 20% BW unilateral load. A Pedar in-shoe pressure system (Novel, Munich, Germany) was used to evaluate center of pressure (COP)-based parameters.
Carrying 20% BW bilateral or unilateral loads significantly increased double support ratio. In addition, carrying a 20% BW unilateral load significantly increased coefficient of variation (CV) of double support ratio, CV of ML COP excursion, and CV of ML COP velocity. Walking on an uneven surface significantly increased double support ratio, ML COP excursion, ML COP velocity, and CV of double support ratio. When carrying a 20% BW unilateral load, unloaded limb stance had significantly increased double support ratio and ML COP velocity, although it appears that the loaded limb may be used to make step-by-step adjustments as evidenced by the higher CV of ML COP velocity.
Unilateral load carriage, walking on uneven surfaces, and unloaded leg stance are of particular concern when considering postural stability.
个体在诸如不平坦或不规则地形等具有挑战性的表面上行走时，通常会承受不对称负荷，这可能比在平坦表面行走需要更高的姿势控制要求。
本研究的目的是评估在平坦和不平坦表面行走时，单负荷与双负荷情况下内侧-外侧（ML）方向的姿势稳定性。
19名健康的年轻成年人在平坦和不平坦的跑步机表面上，在三种负荷条件下行走：无负荷、20%体重（BW）的双侧负荷和20%BW的单侧负荷。使用Pedar鞋垫压力系统（德国慕尼黑Novel公司）评估基于压力中心（COP）的参数。
携带20%BW的双侧或单侧负荷显著增加了双支撑比例。此外，携带20%BW的单侧负荷显著增加了双支撑比例的变异系数（CV）、ML COP偏移的CV和ML COP速度的CV。在不平坦表面行走显著增加了双支撑比例、ML COP偏移、ML COP速度和双支撑比例的CV。当携带20%BW的单侧负荷时，无负荷肢体站立时双支撑比例和ML COP速度显著增加，尽管ML COP速度较高的CV表明，负荷肢体可能用于进行逐步调整。
在考虑姿势稳定性时，单侧负荷携带、在不平坦表面行走和无负荷腿站立尤其值得关注。
