ABSTRACT

This study investigated treadmill familiarisation time in different shoe conditions by comparing lower limb consecutive kinematics waveforms using a trend symmetry method to calculate trend symmetry index, range amplitude ratio and range offset. Eighteen young adults (26.6 ± 3.3 years, 7 females) completed three 10-minute running trials at their preferred running speed (2.30 ± 0.17 m/s) on a treadmill with three shoe conditions (i.e., usual, minimalist and maximalist shoes) in a random order. Sagittal lower limb kinematic data were recorded using inertial measurement units. The results showed that sagittal-plane kinematic waveforms in the hip, knee and ankle remained consistent (trend symmetry > 0.95) without extreme excursions (range amplitude ratio ≈ 1) over 10 minutes within each testing shoe condition. Significant time × shoe interaction effect was observed in range offset (i.e., absolute differences in the average degree of kinematic waveforms between consecutive minutes) at ankle (p = 0.029, ŋ_p² = 0.096) and knee (p = 0.002, ŋ_p² = 0.126). Post-hoc analysis suggested that running with novel shoes required a shorter time to achieve stable lower limb kinematics (2 to 3 minutes) compared with usual shoes (7 minutes). In conclusion, young healthy adults need up to 3 and 7 minutes to familiarise to the treadmill when running at their preferred speed with their novel and usual running shoes.

摘要

本研究通过使用趋势对称方法比较下肢连续运动学波形来计算趋势对称指数、范围振幅比和范围偏移，从而调查不同鞋子条件下跑步机的熟悉时间。18 名年轻人（26.6 ± 3.3 岁，7 名女性）在跑步机上以他们喜欢的跑步速度（2.30 ± 0.17 m/s）完成了 3 次 10 分钟的跑步试验，三种鞋子条件（即普通鞋、极简鞋和极简鞋）在随机顺序。使用惯性测量单元记录矢状下肢运动学数据。结果表明，在每种测试鞋的条件下，髋关节、膝关节和踝关节的矢状面运动学波形在 10 分钟内保持一致（趋势对称性 > 0.95），没有极端偏移（范围振幅比 ≈ 1）。_p ²  = 0.096) 和膝盖 (p = 0.002, ŋ _p ²  = 0.126)。事后分析表明，与普通鞋（7 分钟）相比，穿着新鞋跑步需要更短的时间来实现稳定的下肢运动学（2 至 3 分钟）。总之，年轻健康的成年人穿着新奇的普通跑鞋以他们喜欢的速度跑步时，最多需要 3 到 7 分钟的时间来熟悉跑步机。