Abstract：
Hindfoot, midfoot, and forefoot motion during the stance phase of walking provide insights into the forward progression of the body over the feet via the rocker mechanisms. These segmental motions are affected by walking speed. Increases in walking speed are accomplished by increasing step length and cadence. It is unknown if taking short, medium, and long steps at the same speed would increase hindfoot, midfoot, and forefoot motion similarly to walking speed. We examined effects of different step lengths at the same preferred walking speed on peak forefoot, midfoot, and hindfoot motions related to the foot rockers. Twelve young healthy adults completed five walking trials under three step length conditions in a random order as feet and lower extremity motion were measured via marker positions for the combined Oxford foot and conventional gait models. Peak hindfoot, midfoot, and forefoot joint angles indicating heel, ankle, and forefoot rockers were identified. When walking at the same preferred speed with increase in step length, there were increases in peak hindfoot-tibia plantarflexion angle (p < 0.001; ηp2 = 0.76) in early stance associated with the heel rocker and peak hindfoot-tibia dorsiflexion angle (p = 0.016; ηp2 = 0.39) in midstance associated with ankle rocker. In late stance, the peak hindfoot-tibia plantarflexion angle, forefoot-hindfoot angle, and forefoot-hallux dorsiflexion angle indicating forefoot rocker motion also increased with step length (p < 0.01). When foot kinematics are compared across different individuals or the same individual across different sessions, researchers and clinicians should consider the influence of step length as a contributor to differences in foot kinematics observed.
摘要：
后脚,中足,和前脚掌运动在站立阶段的行走提供了洞察身体向前的进展在脚上通过摇杆机构。这些分段运动受步行速度的影响。步行速度的增加是通过增加步长和节奏来实现的。如果做空，这是未知的，中等,同样速度的长步会增加后脚，中足,和前脚运动类似于步行速度。我们检查了相同首选步行速度下不同步长对前足峰值的影响，中足,和后脚运动有关的脚摇杆。十二名健康的年轻人在三个步长条件下以随机顺序完成了五次步行试验，因为通过牛津足和常规步态模型的标记位置测量了脚和下肢运动。后脚尖，中足,和前足关节角度指示脚跟，脚踝,并确认了前脚摇滚歌手的身份。以相同的首选速度行走时，步长增加，与脚跟摇摆相关的早期姿势中的后足-胫骨跖屈峰值角（p<0.001；ηp2=0.76）增加，与踝关节摇摆相关的中间姿势中的后足-胫骨背屈峰值角（p=0.016；ηp2=0.39）增加。在后期的立场，后足-胫骨跖屈角的峰值，前脚-后脚角度，表明前足摇杆运动的前足背屈角度也随步长增加（p<0.01）。当脚运动学在不同个体或同一个体在不同会话中进行比较时，研究人员和临床医生应将步长的影响视为观察到的足部运动学差异的一个因素.
