Mairiaux P, Malchaire J, Vandiepenbeeck D, Bellelahom L
Work Physiology and Industrial Hygiene Unit, Medical School, Université Catholique de Louvain, Brussels, Belgium.
Scand J Rehabil Med. 1988;20(2):83-8.
Reproducibility of intra-abdominal pressure (IAP) variation was investigated in fifteen young male subjects when lifting three loads, 49, 98 and 147 N, with three speeds of movement, slow, fast and spontaneous, and starting from four standing postures: trunk erect, trunk forward flexed at 30, 60, and 90 degrees of dorsolumbar inclination. Each lift was replicated five times successively and the whole protocol was replicated at one a week interval. The intra-individual variability in IAP response was assessed using the standard deviation of each series of ten lifts. Results showed that variability of peak IAP increased with the load and with the lifting speed. This effect of speed was especially observed for light loads and in forward bending postures. Trunk posture had in itself no significant effect on IAP reproducibility. However, when the variations in the moment acting at lumbar level were taken into account by considering the IAP to moment ratio, the reproducibility of the response was not affected by the load but only by the trunk posture. Reproducibility was lower in the erect posture than in the three flexed positions. It is suggested that this difference relates to the importance in each posture of the moment acting at the shoulder with respect to the total moment acting at lumbar level.
在15名年轻男性受试者中，研究了腹内压（IAP）变化的可重复性。受试者以三种速度（慢速、快速和自发速度）提起三个重量分别为49 N、98 N和147 N的重物，并从四种站立姿势开始：躯干直立、躯干在胸腰椎倾斜30度、60度和90度时向前弯曲。每次提起重物连续重复5次，整个实验方案每隔一周重复一次。使用每组10次提起重物过程中IAP反应的标准差来评估个体内IAP反应的变异性。结果表明，IAP峰值的变异性随负荷和提起速度的增加而增加。这种速度效应在轻负荷和向前弯曲姿势中尤为明显。躯干姿势本身对IAP的可重复性没有显著影响。然而，当通过考虑IAP与力矩的比值来考虑作用于腰椎水平的力矩变化时，反应的可重复性不受负荷影响，仅受躯干姿势影响。直立姿势下的可重复性低于三个弯曲姿势下的可重复性。有人认为，这种差异与每个姿势中作用于肩部的力矩相对于作用于腰椎水平的总力矩的重要性有关。
