Evaluation of the erector spinae muscle ozygenation in awkward posture using near-infrared spectroscopy
In the workplace, localized muscle fatigue can be a limiting factor for prolonged static work. It is important to study the etiology of fatigue in the muscle to prevent discomfort and potential muscle injury. Reduced blood flow or decreased muscle oxygenation is one of the most important factors underlying muscle fatigue. With the advent of near-infrared spectroscopy (NIRS) such measurements can now be made non-invasively. Little is known about the hemodynamics of the muscle while sustaining an awkward posture. Previous studies have shown changes in low back muscle oxygenation levels after static muscle contractions or short-term dynamic lifting exertions. The aim of this study was to document the changes in low back muscle oxygenation during a sustained contraction in trunk flexion whilst lifting different loads. Methods: Eleven young male subjects, mean age (standard deviation) 23.00 (2.49) years, with no history of low back pain during the last 12 months participated in this study. Subjects held a load (5, 10 and 15 kg) in their hands whilst sustaining trunk flexion at 60° for 30 seconds in a random order. Five minutes rest was given between conditions, and each condition was repeated three times to find the reliability of datas. Level of the oxygenation and blood volume of the right erector spinae muscle (ESM) at the level of the 10th thoracic vertebra (T10) and the third lumbar vertebra (L3) was measured continuously using near-infrared spectroscopy during each condition. Results: Compared to the standing posture, at the L3, muscle oxygenation level was remarkably decreased during sustaining unloaded trunk flexion (p=0.059). Using unloaded trunk flexion as a control to ascertain load effect resulted in a significant difference in muscle oxygenation of the unloaded condition and the 15 kg condition (p=0.019). Discussion: Findings of the study provide evidence that near infrared spectroscopy is a reliable tool for measuring physiological change in the low back muscle during forward flexion posture.
Low back pain near infrared spectroscopy muscle ozygenation low back muscle trunk flezion
Mehrnoosh Movahed Hiroyuki Izumi Yoshiyuki Higuchi Masaharu Kumashiro
Department of Ergonomics, Institute of Industrial Ecological Sciences,University of Occupational and Department of Ergonomics, Institute of Industrial Ecological Sciences, University of Occupational an
国际会议
17th World Congress on Ergonomics(第十七届国际人类工效学大会)
北京
英文
1-8
2009-08-09（万方平台首次上网日期，不代表论文的发表时间）