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The effect of trunk-flexed postures on balance and metabolic energy expenditure during standing.

机译：站立时躯干弯曲姿势对平衡和代谢能量消耗的影响。

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STUDY DESIGN: This study analyzed force plate, kinematic, and metabolic energy data of 14 able-bodied subjects standing statically with upright and trunk-flexed postures. OBJECTIVE: To explore the effect of trunk-flexed postures on balance and metabolic energy expenditure during standing. SUMMARY OF BACKGROUND DATA: Abnormal trunk posture often occurs in the presence of spinal deformities, such as lumbar flatback. It is unclear whether alterations in trunk posture affect energy expenditure and the location of the body's center of mass in the transverse plane (BCOMtrans) during standing. METHODS: Kinematic, kinetic, and energy expenditure data were collected with upright trunk alignment and with 25 degrees +/- 7 degrees and 50 degrees +/- 7 degrees of trunk flexion from the vertical. The mean location of the BCOMtrans was estimated from the net center of pressure (COP), which is a weighted average of the COP beneath both feet. RESULTS: The fore-aft position of the net COP under the base of support was not significantly different between postures (P < 0.08). At each posture, the net COP was located 16% of the foot length anterior to the ankle joint centers. However, with increasing trunk flexion, there was a significant increase in oxygen consumption rate (P < 0.001 for all postures). CONCLUSION: Compensatory actions, such as ankle plantarflexion and hip flexion, allowed the mean position of the net COP to remain within a narrowly defined region irrespective of trunk posture. Changes in muscle activity associated with a trunk-flexed posture and the associated compensations likely contributed to the increased energy expenditure.
机译：研究设计：这项研究分析了14位身体健康的受试者的力量板，运动学和代谢能数据，这些受试者以直立和躯干弯曲的姿势静态站立。目的：探讨躯干弯曲姿势对站立过程中平衡和代谢能量消耗的影响。背景数据摘要：躯干姿势异常通常发生在脊柱畸形（例如腰椎平坦）的情况下。目前尚不清楚躯干姿势的改变是否会影响能量消耗以及站立过程中人体质心在横切面上的位置（BCOMtrans）。方法：运动，动能和能量消耗数据通过直立的躯干对准以及躯干从垂直方向屈曲25度+/- 7度和50度+/- 7度收集。 BCOMtrans的平均位置是根据净压力中心（COP）估算的，该净压力中心是双脚下方COP的加权平均值。结果：不同姿势下，净COP在支撑基础下的前后位置无显着差异（P <0.08）。在每种姿势下，净COP均位于踝关节中心前脚长的16％。但是，随着躯干屈曲的增加，耗氧率显着增加（所有姿势的P <0.001）。结论：诸如脚踝plant屈和髋屈曲之类的补偿动作使净COP的平均位置保持在狭窄的区域内，而与躯干姿势无关。与躯干屈曲姿势相关的肌肉活动的变化以及相关的补偿可能导致能量消耗增加。

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