The effect of trunk-flexed postures on balance and metabolic energy expenditure during standing
The effect of trunk-flexed postures on balance and metabolic energy expenditure during standing
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DOI：
10.1097/brs.0b013e318074d515
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发表时间：
2007-07-01
期刊：
影响因子：
3
通讯作者：
Ondra, Stephen
中科院分区：
文献类型：
--
作者：
Saha, Devjani;Gard, Steven;Ondra, Stephen
研究设计.本研究分析了14名身体健全的受试者直立和躯干弯曲姿势静态站立时的力板、运动学和代谢能量数据。探讨躯干屈曲姿势对站立时平衡和代谢能量消耗的影响。躯干姿势异常通常发生在脊柱畸形的情况下，如腰椎平背。目前还不清楚躯干姿势的改变是否会影响站立时的能量消耗和身体质心在横向平面上的位置（BCOMtranss）。在躯干直立对齐和躯干从垂直方向屈曲25度+/- 7度和50度+/- 7度的情况下收集运动学、动力学和能量消耗数据。BCOMtranss的平均位置由净压力中心（COP）估计，COP是双脚下方COP的加权平均值。不同体位下支撑底座下净COP的前后位置无显著性差异（P < 0.08）。在每种姿势下，净COP位于踝关节中心前足长的16%。然而，随着躯干屈曲度的增加，耗氧率显著增加（P < 0.001）。补偿行动，如踝跖屈和髋关节屈曲，允许净COP的平均位置保持在一个狭窄的定义区域内，无论躯干姿势。与躯干屈曲姿势相关的肌肉活动的变化和相关的补偿可能有助于增加能量消耗。
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.