Voluntary changes in step width and step length during human walking affect dynamic margins of stability.
Voluntary changes in step width and step length during human walking affect dynamic margins of stability.
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DOI：
10.1016/j.gaitpost.2012.02.020
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发表时间：
2012-06
期刊：
影响因子：
2.4
通讯作者：
Dingwell, Jonathan B.
中科院分区：
文献类型：
--
作者：
Young, Patricia M. McAndrew;Dingwell, Jonathan B.
“谨慎”步态的特征通常是步伐较宽、较短。然而，我们并没有清楚地了解之间的关系，步骤的特点和个人的稳定性。在这里，我们研究了自愿改变步宽（SW）和步长（SL）对个人的稳定性的影响。14名参与者在3个SL（短，正常与节拍器，长）和3个SW（窄，正常和宽）操作条件下完成了3个3分钟的跑步机行走试验。SL操作产生了平均前后（AP）稳定性边缘（MOSap）的显著变化（p < 0.0005），但不产生内外（ML）稳定性边缘（MOSml）的显著变化（p ≥ 0.0579）。采取更宽的步骤增加了平均M0 Sml，同时降低了M0 Sap（p < 0.0005）。以更宽或更长的步幅行走，每种步幅都增加了支撑基础，导致AP和ML MOS变异性增加（p ≤ 0.0468）。MOSml的逐步分析表明，受试者迈出稳定的步伐，随后立即迈出稳定的步伐。总体而言，短期内，自愿采用更广泛的步骤可能有助于增加瞬时横向稳定性，但较短的步骤并没有改变横向稳定性在不受干扰的步行。我们建议在步态训练计划中考虑观察到的稳定性裕度的变化，该计划建议在步骤特征中进行短期改变以提高稳定性。
“Cautious” gait is generally characterized by wider and shorter steps. However, we do not clearly understand the relationship between step characteristics and individuals’ stability. Here, we examined the effects of voluntarily altering step width (SW) and step length (SL) on individuals’ margins of stability. Fourteen participants completed three 3-minute treadmill walking trials during 3 SL (short, normal with metronome, and long) and 3 SW (narrow, normal and wide) manipulation conditions. SL manipulations yielded significant changes in mean anterior-posterior (AP) margins of stability (MOSap) (p < 0.0005) but not mediolateral (ML) margins of stability (MOSml) (p ≥ 0.0579). Taking wider steps increased mean MOSml while decreasing MOSap (p < 0.0005). Walking with either wider or long steps, each of which increases the base of support, yielded increased AP and ML MOS variability (p ≤ 0.0468). Step-to-step analysis of MOSml indicated that subjects took stable steps followed immediately by stable steps. Overall, short-term, voluntary adoption of wider steps may help increase instantaneous lateral stability but shorter steps did not change lateral stability during unperturbed walking. We suggest that the observed changes in stability margins be considered in gait training programs which recommend short-term changes in step characteristics to improve stability.
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