Briley Simon J, Vegter Riemer J K, Tolfrey Vicky L, Mason Barry S
Peter Harrison Centre for Disability Sport, School of Sport, Exercise and Health Sciences, Loughborough University, Loughborough, Leicestershire LE11 3TU, United Kingdom.
Peter Harrison Centre for Disability Sport, School of Sport, Exercise and Health Sciences, Loughborough University, Loughborough, Leicestershire LE11 3TU, United Kingdom; University of Groningen, University Medical Center Groningen, Department of Human Movement Sciences, Groningen, the Netherlands.
J Biomech. 2020 May 7;104:109725. doi: 10.1016/j.jbiomech.2020.109725. Epub 2020 Mar 2.
The purpose of this study was to investigate whether athletic and nonathletic manual wheelchair users (MWU) display differences in kinetic and kinematic variables during daily wheelchair propulsion. Thirty-nine manual wheelchair users (athletic n = 25; nonathletic n = 14) propelled their own daily living wheelchair on a roller ergometer at two submaximal speeds for three minutes (1.11 m s and 1.67 m s). A 10 camera Vicon motion capture system (Vicon, Motion Systems Ltd. Oxford, United Kingdom) collected three-dimensional kinematics of the upper limbs and thorax at 200 Hz during the final minute of each propulsion trial. Kinetics, kinematics and kinematic variability were compared between athletic and nonathletic groups. Kinematic differences were investigated using statistical parametric mapping. Athletic MWU performed significantly greater physical activity per week compared to nonathletic MWU (920 ± 601 mins vs 380 ± 147 mins, respectively). However, no significant biomechanical differences between athletic and nonathletic MWU were observed during either propulsion speed. During the 1.11 m s trial wheelchair users displayed a stroke frequency of 53 ± 12 pushes/min and a contact angle of 92.5 ± 16.2°. During the 1.67 m s trial the mean stroke frequency was 64 ± 22 pushes/min and contact angle was 85.4 ± 13.6°. Despite the hand being unconstrained during the recovery phase the magnitude of joint kinematic variability was similar across both glenohumeral and scapulothoracic joints during recovery and push phases. To conclude, although athletic MWU participate in more physical activity per week they adopt similar strategies to propel their daily living wheelchair. Investigations of shoulder pain and dailywheelchair propulsion do not need to distinguish between athletic and nonathletic MWU.
本研究的目的是调查竞技型和非竞技型手动轮椅使用者（MWU）在日常轮椅推进过程中，动力学和运动学变量是否存在差异。39名手动轮椅使用者（竞技型n = 25；非竞技型n = 14）在滚筒测力计上以两种亚最大速度（1.11 m/s和1.67 m/s）推动自己的日常生活用轮椅，持续三分钟。在每次推进试验的最后一分钟，一个由10台摄像机组成的Vicon运动捕捉系统（Vicon，英国牛津运动系统有限公司）以200 Hz的频率收集上肢和胸部的三维运动学数据。对竞技组和非竞技组的动力学、运动学和运动学变异性进行了比较。使用统计参数映射研究运动学差异。与非竞技型MWU相比，竞技型MWU每周进行的体育活动明显更多（分别为920±601分钟和380±147分钟）。然而，在任何一种推进速度下，均未观察到竞技型和非竞技型MWU之间存在显著的生物力学差异。在1.11 m/s的试验中，轮椅使用者的划频为53±12次/分钟，接触角为92.5±16.2°。在1.67 m/s的试验中，平均划频为64±22次/分钟，接触角为85.4±13.6°。尽管在恢复阶段手没有受到限制，但在恢复阶段和推阶段，肩肱关节和肩胛胸壁关节的关节运动学变异性大小相似。总之，尽管竞技型MWU每周参与更多的体育活动，但他们采用相似的策略来推动日常生活用轮椅。对肩痛和日常轮椅推进的研究无需区分竞技型和非竞技型MWU。
