Li Yumeng, Simpson Kathy J, Nolan Lee, Miller Marilyn, Johnson Benjamin
a Department of Kinesiology , California State University , Chico , CA , USA.
b Department of Kinesiology , University of Georgia , Athens , GA , USA.
J Sports Sci. 2018 Feb;36(3):293-302. doi: 10.1080/02640414.2017.1303186. Epub 2017 Mar 21.
The purpose of the study was to determine if the kinematics exhibited by skilled runners wearing a unilateral, transtibial prosthesis during the curve section of a 200-m sprint race were influenced by interaction of limb-type (prosthetic limb (PROS-L) vs. nonprosthetic limb (NONPROS-L)) and curve-side (inside and outside limb relative to the centre of the curve). Step kinematics, toe clearance and knee and hip flexion/extension, hip ab/adduction for one stride of each limb were generated from video of 13 males running the curve during an international 200 m transtibial-classified competition. Using planned comparisons (P < 0.05), limb-type and curve-side interactions showed shortest support time and lowest hip abduction displacement by outside-NONPROS-L; shortest step length and longest time to peak knee flexion by the inside-PROS-L. For limb-type, greater maximum knee flexion angle and lower hip extension angles and displacement during support and toe clearance of PROS-Ls occurred. For curve-side, higher hip abduction angles during non-support were displayed by inside-limbs. Therefore, practitioners should consider that, for curve running, these kinematics are affected mostly by PROS-L limitations, with no clear advantage of having the PROS-L on either side of the curve.
本研究的目的是确定在200米短跑比赛的弯道部分，佩戴单侧经胫骨假肢的熟练跑步者所表现出的运动学是否受到肢体类型（假肢肢体（PROS-L）与非假肢肢体（NONPROS-L））和弯道侧（相对于弯道中心的内侧和外侧肢体）相互作用的影响。从13名男性在国际200米经胫骨分级比赛中跑弯道的视频中生成了每个肢体一步的步运动学、脚趾离地间隙以及膝关节和髋关节的屈伸、髋关节的内收/外展数据。通过计划比较（P<0.05），肢体类型和弯道侧的相互作用显示，外侧-NONPROS-L的支撑时间最短，髋关节外展位移最小；内侧-PROS-L的步长最短，达到膝关节最大屈曲的时间最长。对于肢体类型，PROS-L在支撑和脚趾离地期间出现更大的膝关节最大屈曲角度以及更低的髋关节伸展角度和位移。对于弯道侧，内侧肢体在非支撑期间显示出更高的髋关节外展角度。因此，从业者应该考虑到，对于弯道跑步，这些运动学主要受PROS-L限制的影响，在弯道两侧佩戴PROS-L并没有明显优势。
