A Stimulation Method to Assess the Contractile Status of the Lumbar Extensors in a Seated Posture

作者：Jia Bochen; Nus**aum Maury A^*; Agnew Michael J

来源：Human Factors and Ergonomics in Manufacturing, 2015, 25(6): 674-684.

DOI：10.1002/hfm.20584

• Muscle stimulation
• Stimulation frequency
• Lumbar extensors

The purpose of present study was to develop and evaluate methods to assess stimulation responses of the lumbar extensors, as part of a longer-term goal of detecting fatigue during prolonged sitting. Three stimulation frequencies (2, 5, and 8Hz) were tested in separate stages, which include 3 stimulation trains and 4 sampling blocks. Repeated measures analyses of variance were used to determine whether any significant differences in mean stimulation responses occurred with respect to stimulation frequency, sampling block, and stimulation train. Reliability of measured stimulation responses was assessed within and between sampling blocks using intraclass correlation coefficients. Stimulation frequencies significantly affected the stimulation responses and time-to-potentiation differed between the 3 stimulation frequencies; it was highest for 2Hz stimulation. All 3 stimulation frequencies resulted in excellent reliability within and between sampling blocks. Use of the current protocol at 2Hz is recommended as appropriate to measure the lumbar extensors status during prolonged sitting.

• 出版日期2015-12
• 单位Virginia Tech; 美国弗吉尼亚理工大学(Virginia Tech)