Institut National de Recherche et de Sécurité, 1 rue du Morvan, CS 60027, Vandoeuvre les Nancy Cedex 54519, France; Institut Régional de Médecine Physique et de Réadaptation, 75 boulevard Lobau, CS 34209, Nancy Cedex 54042, France; Centre de Ressources, d'Expertise et de Performance Sportives, 1 Av Foch, BP 30020, Essey les Nancy 54271, France.
Institut National de Recherche et de Sécurité, 1 rue du Morvan, CS 60027, Vandoeuvre les Nancy Cedex 54519, France.
Appl Ergon. 2014 Jul;45(4):1056-62. doi: 10.1016/j.apergo.2014.01.002. Epub 2014 Feb 9.
The aim of this study was to quantify cardiac, energetic and subjective strains during manual wheelchair (MWC) travel on cross slopes (Cs). 25 paraplegics achieved eight 300 m propulsion tests combining 4 Cs (0, 2, 8 and 12%) and 2 velocities (Vi = 0.97 m s(-1), Vc "comfortable"). Heart rate and oxygen uptake were recorded continuously. Subjective rating (RPE) was made on completion of each test. Vc exceeds Vi for all Cs. Cardiac and energetic strains at Vc also exceed those at Vi (p < 0.01). Mean cardiac cost (in bpm) at Vc is 34 (SD = 13) bpm for a 0/2% Cs and 55 (18) bpm for a 12% Cs. Mean energetic cost (in J m(-1) kg(-1)) is 1.20 (0.38) and 2.76 (0.97) for respectively 0/2% and 12% Cs at Vi and, at Vc 1.50 (0.43) and 3.37 (1.43) for 0/2% and 12% Cs respectively. Subjective rating was considered as moderate for a 12% Cs. MWC users with high level injuries travel faster as those with low level injuries. Strain increase is linear for Cs from 0% to 12%. The results suggest that 2% Cs is generally acceptable, while 8% would be a critical threshold.
本研究旨在量化在横坡（Cs）上手动轮椅（MWC）行驶时的心脏、能量和主观负荷。25 名截瘫患者完成了八项 300 米推进测试，其中包括 4 种 Cs（0、2、8 和 12%）和 2 种速度（Vi=0.97m/s，Vc“舒适”）。连续记录心率和耗氧量。完成每项测试后进行主观评分（RPE）。对于所有 Cs，Vc 都超过 Vi。Vc 时的心脏和能量负荷也超过 Vi 时（p<0.01）。对于 0/2%Cs，Vc 时的平均心脏负荷（bpm）为 34（SD=13）bpm，对于 12%Cs 为 55（18）bpm。对于分别为 0/2%和 12%Cs 的 Vi，平均能量消耗（J/m(-1)kg(-1)）分别为 1.20（0.38）和 2.76（0.97），对于 0/2%和 12%Cs 的 Vc 分别为 1.50（0.43）和 3.37（1.43）。对于 12%Cs，主观评分被认为是中度的。高水平损伤的 MWC 用户比低水平损伤的用户移动得更快。Cs 从 0%增加到 12%时，负荷呈线性增加。结果表明，2%的 Cs 通常是可以接受的，而 8%则是一个关键阈值。
