Abstract The foot seems to demonstrate considerable power absorption and generation characteristics during running. These have been mainly accounted to the mechanics of the ankle joint, however, evidence suggests that joint kinetics have been overestimated by single-segment foot models. The scope of the present study was to estimate the energetics of the ankle-, chopart-, lisfranc- and hallux joint during heel-strike running. Power absorption and generation occuring at different segments of the foot of seven asymptomatic adults was modelled using a four-segment kinetic foot model. Participants ran barefoot with an average running speed 3.5 m/s along a 10 meter walkway. The peak power generation of the ankle, chopart, lisfranc, and hallux joint reached respectively an average of 13.9, 4.12, 1.08 and 0.32 Watt/kg. The Lisfranc joint showed poor power absorption compared to the other three joints. It was further demonstrated that the Ankle and Chopart joints seem to have both receptive and propulsive characteristics. The behavior of the Lisfranc joint complied almost exclusively with propulsive characteristics. Finally, it can be concluded that the midfoot accounts for approximately 25% of the total power absorption occuring at the foot joints and not 50% as initially hypothesized.

中文翻译：

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足关节在人体跑步能量学中的贡献

摘要 脚在跑步过程中似乎表现出相当大的功率吸收和产生特性。这些主要是与踝关节力学有关，然而，有证据表明单节足模型高估了关节动力学。本研究的范围是估计脚跟撞击跑步过程中踝关节、chopart-、lisfranc-和拇趾关节的能量。使用四段动能足部模型对发生在 7 名无症状成人足部不同部位的能量吸收和产生进行建模。参与者在一条 10 米长的走道上赤脚跑步，平均跑步速度为 3.5 m/s。踝关节、chopart、lisfranc和拇关节的峰值发电量分别达到平均13.9、4.12、1.08和0.32 Watt/kg。与其他三个关节相比，Lisfranc 关节表现出较差的功率吸收。进一步证明，踝关节和肖帕特关节似乎同时具有接受性和推进性特征。Lisfranc 接头的行为几乎完全符合推进特性。最后，可以得出结论，中足约占足关节总能量吸收的 25%，而不是最初假设的 50%。