Chénier Félix, Champagne Audrey, Desroches Guillaume, Gagnon Dany H
Pathokinesiology Laboratory, Centre for Interdisciplinary Research in Rehabilitation of Greater Montreal, Institut universitaire sur la réadaptation en déficience physique de Montréal, 6300 Darlington, Montreal, QC, H3S 2J4, Canada; Department of Physical Activity Sciences, Université du Québec à Montréal, Biological Sciences Building, 141 President-Kennedy, Montreal, QC, H2X 1Y4, Canada; Department of Automated Manufacturing Engineering, École de technologie supérieure, 1100 Notre-Dame Ouest, Montreal, QC, H3C 1K3, Canada.
Pathokinesiology Laboratory, Centre for Interdisciplinary Research in Rehabilitation of Greater Montreal, Institut universitaire sur la réadaptation en déficience physique de Montréal, 6300 Darlington, Montreal, QC, H3S 2J4, Canada; School of Rehabilitation, Université de Montréal, 7077 Park, Montreal, QC, H3N 1X7, Canada.
Gait Posture. 2018 Mar;61:398-402. doi: 10.1016/j.gaitpost.2018.02.009. Epub 2018 Feb 12.
Manual wheelchair (MWC) propulsion is increasingly assessed on a motorized treadmill (TM), which is often considered more ecologically valid than stationary rollers. However, no clear consensus on the similarities between overground (OG) and TM propulsion has yet been reached. Furthermore, no study has investigated the participants' perceptions of propelling a MWC on a TM compared to OG.
The present study aims to assess the perception of speed when propelling on a TM vs OG, and to relate this perception to measured spatiotemporal variables, kinetics and work.
In this repeated-measures study, the propulsion's spatiotemporal variables, kinetics, and work of nineteen experienced wheelchair users with a spinal cord injury were compared between three conditions: 1) OG at a self-selected speed, 2) on a TM at a self-selected speed perceived as being similar to the OG speed (TM), and 3) on a TM at the same speed as OG (TM). Each variable was compared between conditions using an analysis of variance for repeated measures.
All participants selected a lower speed for TM than OG, with a difference of -0.6 m/s (-44%). This adaptation may be due to a combination of two factors: 1) the absence of speed information, and 2) the feeling of urgency to grab the wheels during the recovery phase. The power output, work per cycle, and work per minute were also much lower on TM than OG. However, in contrast to other work on MWC propulsion on a TM, the kinetic variables assessed were all similar between the OG and TM conditions.
Training on a TM should be performed at a speed that matches the OG speed and not at a self-selected speed on the TM, which would reduce the power output and work and therefore reduce the efficiency of the training.
手动轮椅（MWC）推进力越来越多地在电动跑步机（TM）上进行评估，电动跑步机通常被认为比固定滚筒更符合生态学效度。然而，对于地面（OG）推进和跑步机推进之间的相似性尚未达成明确共识。此外，尚无研究调查参与者对在跑步机上推进MWC与在地面推进的看法。
本研究旨在评估在跑步机上与在地面上推进时的速度感知，并将这种感知与测量的时空变量、动力学和功联系起来。
在这项重复测量研究中，比较了19名脊髓损伤的经验丰富的轮椅使用者在三种条件下推进的时空变量、动力学和功：1）以自选速度在地面推进，2）在跑步机上以自认为与地面速度相似的自选速度推进（TM），3）在跑步机上以与地面相同的速度推进（TM）。使用重复测量方差分析比较各条件之间的每个变量。
所有参与者选择的跑步机速度均低于地面速度，相差-0.6 m/s（-44%）。这种适应性可能是由于两个因素的综合作用：1）缺乏速度信息，2）在恢复阶段抓住轮子的紧迫感。跑步机上的功率输出、每周期功和每分钟功也远低于地面。然而，与其他关于在跑步机上推进MWC的研究不同，在地面和跑步机条件下评估的动力学变量均相似。
在跑步机上进行训练时，应采用与地面速度匹配的速度，而不是在跑步机上的自选速度，这将降低功率输出和功，从而降低训练效率。
