Changes in spine loading patterns throughout the workday as a function of experience, lift frequency, and personality.
Changes in spine loading patterns throughout the workday as a function of experience, lift frequency, and personality.
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DOI：
10.1016/j.spinee.2005.10.011
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发表时间：
2006-05-01
期刊：
影响因子：
--
通讯作者：
Marras, William S
中科院分区：
文献类型：
--
作者：
Chany, Anne-Marie;Parakkat, Julia;Marras, William S
背景：社会心理压力源与下腰痛报告相关。然而，对心理社会风险因素的反应可能取决于个体的个性类型，这反过来又会影响肌肉招募和脊柱负荷。本研究探讨了人格如何可能与脊柱负荷在整个workshift.Purpose进行重复提升过程中相关：评估脊柱负荷作为一个功能的个人的人格类型在重复，长期暴露于材料处理任务。研究设计：实验室实验，有经验和没有经验的参与者进行重复，在一系列的8小时暴露期内，在各种载荷和提升频率水平下进行不对称提升。脊柱负荷监测整个workingperiod. Patient样本：12个新手和12个经验丰富的材料处理谁是无症状的背部pains.OUTCOME MEASURES：脊柱压缩，前后（A/P）剪切，横向剪切在L5-S1 level.METHODS：参与者被归类为人格类型的基础上的迈尔斯-布里格斯人格类型指标。一个肌电图辅助的生物力学模型被用来评估脊柱压缩，A/P剪切，和横向剪切整个exposure period.RESULTS：结果表明，直觉有较高的剪切脊柱负荷，无论时刻曝光，升降机频率，并通过工作时间，相比传感器的个性类型。此外，与评判者的人格特质相比，感知者的人格中出现了更高的脊柱压缩力和剪切力，无论时刻如何，通常也无论提升频率如何。新手举重者通常经历了更大的脊柱loading.CONCLUSIONS：结果表明，当存在一个个性的工作环境不匹配，脊柱负荷增加，通过增加对抗性共同收缩。这些趋势表明，内在的个性特征可能在执行重复性提升任务时的运动控制策略中发挥作用。
BACKGROUND CONTEXT: Psychosocial stressors have been associated with low back pain reporting. However, response to psychosocial risk factors may be dependent on the individual's personality type that, in turn, can affect muscle recruitment and spine loading. This study explores how personality might be associated with spine loading during repetitive lifting performed throughout an entire work shift.PURPOSE: Assess spine loading as a function of an individual's personality type during repetitive, long-term exposure to a materials handling tasks.STUDY DESIGN: Laboratory experiment where experienced and inexperienced participants performed repetitive, asymmetric lifts at various load and lift frequency levels throughout a series of 8-hour exposure periods. Spine loads were monitored throughout the work period.PATIENT SAMPLE: Twelve novice and 12 experienced materials handlers who were asymptomatic for back pain.OUTCOME MEASURES: Spine compression, anterior-posterior (A/P) shear, and lateral shear at the L5-S1 level.METHODS: Participants were categorized into personality types based upon the Myers-Briggs personality type indicator. An electromyography-assisted biomechanical model was used to assess spine compression, A/P shear, and lateral shear throughout the exposure period.RESULTS: The results indicate that intuitors had higher shear spinal loading regardless of moment exposure, lift frequency, and time through the work period, compared with the sensor personality type. In addition, higher spine compressive and shear forces occurred in the perceiver personality compared with the judgers' personality trait, regardless of moment and, often, lift frequency. Novice lifters typically experienced greater spine loading.CONCLUSIONS: The results suggest that when there exists a personality-job environment mismatch, spinal loading increases via an increase in antagonistic co-contraction. The trends suggest that inherent personality characteristics may play a role in one's motor control strategies when performing a repetitive lifting task.