Abstract：
Footwear may moderate the transiently heightened asymmetry in lower limb loading associated with peak growth in adolescence during running. This repeated-measures study compared the magnitude and symmetry of peak vertical ground reaction force and instantaneous loading rates (VILRs) in adolescents during barefoot and shod running. Ten adolescents (age, 10.6 ± 1.7 years) ran at self-selected speed (1.7 ± 0.3 m/s) on an instrumented treadmill under three counter-balanced conditions; barefoot and shod with partial-minimal and conventional running shoes. All participants were within one year of their estimated peak height velocity based on sex-specific regression equations. Foot-strike patterns, peak vertical ground reaction force and VILRs were recorded during 20 seconds of steady-state running. Symmetry of ground reaction forces was assessed using the symmetry index. Repeated-measures ANOVAs were used to compare conditions (α=.05). Adolescents used a rearfoot foot-strike pattern during barefoot and shod running. Use of conventional shoes resulted in a lower VILR (P < .05, dz = 0.9), but higher VILR asymmetry (P < .05) than running barefoot (dz = 1.5) or in partial-minimal shoes (dz = 1.6). Conventional running shoes result in a lower VILR than running unshod or in partial-minimal shoes but may have the unintended consequence of increasing VILR asymmetry. The findings may have implications for performance, musculoskeletal development and injury in adolescents.
摘要：
鞋类可以缓解与跑步过程中青春期的高峰增长相关的下肢负荷的短暂增加的不对称性。这项重复测量研究比较了青少年赤脚和shood跑步时峰值垂直地面反作用力和瞬时载荷率（VILR）的大小和对称性。十个青少年（年龄，10.6±1.7年）在三种平衡条件下，在带仪表的跑步机上以自己选择的速度（1.7±0.3m/s）跑步；赤脚穿着部分最小和常规的跑鞋。所有参与者都在根据性别特异性回归方程估计的峰值高度速度的一年内。脚踏模式，在稳态运行的20秒内记录了峰值垂直地面反作用力和VILRs。使用对称指数评估地面反作用力的对称性。重复测量ANOVAs用于比较条件(α=.05)。青少年在赤脚和穿鞋跑步时使用后脚踩方式。使用常规鞋导致较低的VILR（P<.05，dz=0.9），但VILR不对称性（P<.05）高于赤脚（dz=1.5）或部分最小鞋子（dz=1.6）。传统的跑鞋比单鞋或部分最小的跑鞋导致较低的VILR，但可能会导致增加VILR不对称性的意外后果。这些发现可能会对绩效产生影响，青少年肌肉骨骼发育和损伤。
