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Full text of this paper is not available in the ETD Center. Copies may be available for inter-library loan from University of Cincinnati or may be available for purchase from Proquest/UMI

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THE EFFECT OF FATIGUE ON ELECTROMYOGRAPHY ACTIVITY PATTERNS WHILE PERFORMING TASKS ON INCLINED SURFACES

LU, MING-LUN
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1005935212

Abstract Details

2001, PhD, University of Cincinnati, Medicine : Environmental Health Sciences.
Fall-related fatal injuries remain a major safety problem in the workplace. This study investigated the effects of visual cues, muscular fatigue and a reach task on workers' postural stability on three different inclinations 0°, 14°, and 26°. Nineteen subjects from roofing-related industries participated in the study. Postural stability was measured in terms of sway (sway length and area) by a force platform. The electromyographic (EMG) activity levels of eight postural muscles (left and right quadriceps, hamstrings, tibialis anterior, and gastrocnemius) were measured to investigate the relationships between the EMG and sway variables in different test conditions. The conditions included 3 inclinations ( 2 visual cues settings (with or without) ( 3 levels of fatigue (full, half and no) ( 2 tasks (forward reach and stationary). The 95th percentile value of the EMG activity for each muscle was used as the EMG measure. Additionally, a questionnaire was administered to acquire workers' subjective perceived sense of postural sway and instability (PSPSI) for each test condition. Results from a regression analysis showed that the eight muscles, except quadriceps, were significant predictors of sway length, while the hamstrings and gastrocnemii were significant predictors of sway area. Results from a repeated measure analysis of covariance showed that inclination, reach task and their interaction were found to have significant effects (p<0.001) on sway length and area, whereas visual cues were significant on sway length (p<0.001). Inclination was found to be significantly associated with the quadriceps and tibialii anterior, while task was significantly related to the hamstrings and gastrocnemii. Workers' PSPSI were significantly affected by inclination and fatigue. The mismatch (different significant effects of test conditions) between the PSPSI and sway variables may increase the propensity for loss of balance while working on inclined surfaces.
Dr. Amit Bhattacharya (Advisor)
1 p.
Health Sciences, General
BALANCE; FALLS; POSTURAL INSTABILITY; FATIGUE; EMG

Recommended Citations

Citations

  • LU, M.-L. (2001). THE EFFECT OF FATIGUE ON ELECTROMYOGRAPHY ACTIVITY PATTERNS WHILE PERFORMING TASKS ON INCLINED SURFACES [Doctoral dissertation, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1005935212

    APA Style (7th edition)

  • LU, MING-LUN. THE EFFECT OF FATIGUE ON ELECTROMYOGRAPHY ACTIVITY PATTERNS WHILE PERFORMING TASKS ON INCLINED SURFACES. 2001. University of Cincinnati, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1005935212.

    MLA Style (8th edition)

  • LU, MING-LUN. "THE EFFECT OF FATIGUE ON ELECTROMYOGRAPHY ACTIVITY PATTERNS WHILE PERFORMING TASKS ON INCLINED SURFACES." Doctoral dissertation, University of Cincinnati, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1005935212

    Chicago Manual of Style (17th edition)

ucin1005935212
© 2001, all rights reserved.
This open access ETD is published by University of Cincinnati and OhioLINK.