Hobara Hiroaki, Tominaga Shuichi, Umezawa Shingo, Iwashita Koudai, Okino Atsuo, Saito Taku, Usui Fumio, Ogata Toru
Research Institute, National Rehabilitation Center for Persons with Disabilities, Department of Rehabilitation for the Movement Functions, Namiki 4-1, Tokorozawa, Saitama, Japan.
Prosthet Orthot Int. 2012 Sep;36(3):312-7. doi: 10.1177/0309364612442121.
Understanding leg stiffness (K (leg)) in amputee sprinters is important for the evaluation of their sprint ability and development of running-specific prostheses (RSP).
To investigate K (leg) during hopping in amputee sprinters.
Cross-sectional study.
Seven transtibial (TT) and seven transfemoral (TF) amputee sprinters, as well as seven non-active able-bodied subjects, performed one-legged hopping matching metronome beats at 2.2 Hz. Amputees hopped on their sound limb whereas able-bodied (AB) subjects hopped on their dominant limb. Using a spring-mass model, K (leg) was calculated from the subjects' body mass, ground contact and flight times.
Both TT and TF sprinters demonstrated significantly higher K (leg) than AB subjects. K (leg) during hopping on the sound leg significantly correlated with personal records attained in a 100-m sprint in both TT (r = -0.757) and TF sprinters (r = -0.855).
The results of the present study suggest that amputee sprinters have a greater K (leg) during hopping than inactive non-amputees, and that their sprint ability can be predicted from the K (leg) during hopping at 2.2 Hz on the sound limb.
了解截肢短跑运动员的腿部刚度（K（腿））对于评估他们的短跑能力和开发特定跑步假肢（RSP）至关重要。
研究截肢短跑运动员单腿跳时的K（腿）。
横断面研究。
7名单胫骨（TT）截肢短跑运动员、7名经股骨（TF）截肢短跑运动员以及7名不活跃的健全受试者，以2.2赫兹的节拍跟随节拍器进行单腿跳。截肢运动员用其健全肢体单腿跳，而健全（AB）受试者用其优势肢体单腿跳。使用弹簧质量模型，根据受试者的体重、地面接触时间和腾空时间计算K（腿）。
TT和TF短跑运动员的K（腿）均显著高于AB受试者。在健全腿上单腿跳时的K（腿）与TT短跑运动员（r = -0.757）和TF短跑运动员（r = -0.855）在100米短跑中的个人最好成绩显著相关。
本研究结果表明，截肢短跑运动员单腿跳时的K（腿）比不活跃的非截肢者更大，并且可以根据他们在健全肢体上以2.2赫兹单腿跳时的K（腿）来预测其短跑能力。
