Hobara Hiroaki, Saito Sakiko, Hashizume Satoru, Namiki Yuta, Kobayashi Yoshiyuki
1 National Institute of Advanced Industrial Science and Technology, Tokyo, Japan.
2 Tokyo University of Science, Chiba, Japan.
Prosthet Orthot Int. 2018 Dec;42(6):567-570. doi: 10.1177/0309364618767142. Epub 2018 Apr 24.
: Although Paralympic T42 class Men's 200 m sprints are currently competed by athletes with bilateral and unilateral transfemoral amputations, there may be performance differences between the groups. This study aimed to compare the spatiotemporal parameters of a 200-m sprint between bilateral and unilateral transfemoral amputees wearing running-specific prostheses.
: We analyzed 29 races (nine sprinters) with bilateral or unilateral transfemoral amputations from publicly available Internet broadcasts. For each sprinter's race, the average speed, step frequency, and step length were calculated using the number of steps in conjunction with the official race time.
: Average speed of bilateral transfemoral amputees was 5.7% greater than in unilateral transfemoral amputees. Bilateral transfemoral amputees exhibited lower step frequency (-8.9%) but longer step length (16.3%) than unilateral transfemoral amputees. Therefore, even in the same Paralympic classification (T42), different spatiotemporal strategies exist between bilateral and unilateral transfemoral amputees wearing running-specific prostheses during 200-m sprints.
Since different spatiotemporal strategies exist between bilateral and unilateral transfemoral amputees during 200-m sprints, our data supports recent revisions of classification rules (1st January, 2018), which each population was allocated into the different classification (T61 and T63, respectively).
尽管目前残奥会T42级男子200米短跑比赛由双侧和单侧经股骨截肢的运动员参加，但两组之间可能存在成绩差异。本研究旨在比较佩戴特定跑步假肢的双侧和单侧经股骨截肢者在200米短跑中的时空参数。
我们从公开的网络广播中分析了29场（9名短跑运动员）双侧或单侧经股骨截肢的比赛。对于每位短跑运动员的比赛，结合步数和官方比赛时间计算平均速度、步频和步长。
双侧经股骨截肢者的平均速度比单侧经股骨截肢者快5.7%。与单侧经股骨截肢者相比，双侧经股骨截肢者步频更低（-8.9%），但步长更长（16.3%）。因此，即使在相同的残奥会分级（T42）中，佩戴特定跑步假肢的双侧和单侧经股骨截肢者在200米短跑过程中也存在不同的时空策略利用方式。
由于双侧和单侧经股骨截肢者在200米短跑过程中存在不同的时空策略利用方式，我们的数据支持了最近的分级规则修订（自2018年1月1日起），即每组被分配到不同的分级（分别为T61和T63）。
