Kotajarvi Brian R, Sabick Michelle B, An Kai-Nan, Zhao Kristin D, Kaufman Kenton R, Basford Jeffrey R
Orthopedic Biomechanics Laboratory, Mayo Clinic, Rochester, MN; Motion Analysis Laboratory, Mayo Clinic,Rochester, MN 55905, USA.
J Rehabil Res Dev. 2004 May;41(3B):403-14. doi: 10.1682/jrrd.2003.01.0008.
This study examined the effect of seat position on handrim biomechanics. Thirteen experienced users propelled a wheelchair over a smooth level floor at a self-selected speed. Kinetic and temporal-distance data were collected with the use of an instrumented rim and a motion analysis system. A custom-designed axle was used to change the seat position. We used repeated measures analysis of variance to evaluate if differences existed in the temporal-distance and kinetic data with change in seat position. Results showed that a shorter distance between the axle and shoulder (low seat height) improved the push time and push angle temporal variables (p < 0.0001). Tangential force output did not change with seat position. Axial and radial forces were highest in the lowest seat position (p < 0.001). Propulsion efficiency as measured by the fraction of effective force did not significantly change with seat position.
本研究考察了座位位置对手轮圈生物力学的影响。13名经验丰富的使用者以自行选择的速度在平坦光滑的地面上推动轮椅。使用装有传感器的轮圈和运动分析系统收集动力学和时间-距离数据。采用定制设计的轴来改变座位位置。我们使用重复测量方差分析来评估随着座位位置的改变，时间-距离和动力学数据是否存在差异。结果显示，轴与肩部之间的距离较短（座位高度较低）可改善推注时间和推注角度等时间变量（p<0.0001）。切向力输出不随座位位置而变化。轴向力和径向力在最低座位位置时最高（p<0.001）。以有效力分数衡量的推进效率不随座位位置而显著变化。
