Department of Orthopaedic Surgery, University Hospital, Ghent, Belgium.
Dev Med Child Neurol. 2011 Mar;53(3):245-9. doi: 10.1111/j.1469-8749.2010.03829.x. Epub 2010 Nov 18.
Energy cost of walking (ECOW) is defined as 'walking oxygen consumption minus resting oxygen consumption divided by speed', where 'resting' data can be obtained either at the start or cessation of a test. This study aimed to ascertain when resting data should be taken during an ECOW test in children with cerebral palsy (CP).
Resting oxygen consumption per unit mass (VO(2) ) and heart rate were recorded in children without physical impairment (18 males, 13 females; mean age 11 y [SD 2 y 1 mo]) and children with diplegic CP (18 males, 13 females; mean age 11 y [SD 2 y 6 mo, Gross Motor Function Classification System levels I and II]) at three stages, namely pre- and posttest sitting and pretest standing before and after an 8-minute ECOW test using the Cosmed K4b.
Heart rate and VO(2) differed significantly between groups and stages (p ≤ 0.05) except for heart rate in standing and posttest sitting in the unimpaired children and for VO(2) during pretest sitting between groups. These differences impacted on the calculation of non-dimensional net oxygen cost (NDNOC) and physiological cost index (PCI) in CP but not in the unimpaired group. PCI was correlated with NDNOC in CP but not in the unimpaired cohort.
Pretest sitting resting data appear to be the most appropriate for use in the calculation of NDNOC and PCI. PCI may still have relevance in pathology where walking efficiency is compromised.
能量消耗（ECOW）定义为“行走时的耗氧量减去休息时的耗氧量除以速度”，其中“休息”数据可以在测试开始或结束时获得。本研究旨在确定脑瘫（CP）患儿 ECOW 测试中应在何时获取休息数据。
在没有身体障碍的儿童（18 名男性，13 名女性；平均年龄 11 岁[标准差 2 岁 1 个月]）和患有双瘫 CP 的儿童（18 名男性，13 名女性；平均年龄 11 岁[标准差 2 岁 6 个月，总体运动功能分类系统水平 I 和 II]）中，在三个阶段记录单位质量的休息耗氧量（VO2）和心率，即测试前和测试后坐姿，以及 8 分钟 ECOW 测试前和测试后站姿，使用 Cosmed K4b。
心率和 VO2 在组间和阶段间差异显著（p≤0.05），除了无损伤儿童站立和测试后坐姿的心率以及组间测试前坐姿的 VO2 外。这些差异影响了 CP 中非维度净耗氧量（NDNOC）和生理成本指数（PCI）的计算，但对无损伤组没有影响。CP 中的 PCI 与 NDNOC 相关，但在无损伤队列中则不然。
测试前坐姿的休息数据似乎最适合用于计算 NDNOC 和 PCI。在行走效率受损的情况下，PCI 可能仍然具有相关性。
