A neuro-fuzzy model for estimating electromyographical activity of trunk muscles due to manual lifting

Details

• Personal Author:
  Karwowski W ; Lee W ; Marras WS ; Rodrick D
• Description:
  The main objective of this study was to develop a hybrid neuro-fuzzy system for estimating the magnitude of EMG responses of 10 trunk muscles based on two lifting task variables (trunk velocity and trunk moment) as model inputs. The input and output variables were represented using the fuzzy membership functions. The initial fuzzy rules were generated by the neural network using true EMG data. Two different laboratory-derived EMG data sets were used for model development and validation, respectively. The mean absolute error (MAE) between the actual and model-estimated normalized EMG values was calculated. Across all muscles, the average value of MAE was 8.43% (SD=2.87%) of the normalized EMG data. The larger absolute errors occurred in the left side of the trunk, which exhibited higher levels of muscular activity. Overall, the developed model was capable of estimating the normalized EMG values with average value of the mean absolute differences of 6.4%. It was hypothesized that model performance could be improved by increasing the number of inputs, including additional task variables as well as the subjects' characteristics. [Description provided by NIOSH]
• Subjects:
  Air Movements Air Pollutants, Occupational Air Pollution, Indoor Dust Environmental Monitoring Mining Occupational Health Safety Ventilation
• Keywords:
  Author Keywords: Neural Networks Biomechanical-modeling Biomechanics Computer-models Electromyography Fuzzy Sets Manual-lifting Manual-materials-handling Manual Materials Handling Materials-handling Mathematical-models Models Musculoskeletal-system

  More +
• ISSN:
  0014-0139
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  Kentucky ; Ohio ; OSHA Region 4 ; OSHA Region 5
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  285-309
• Volume:
  46
• Issue:
  1
• NIOSHTIC Number:
  nn:20041184
• Citation:
  Ergonomics 2003 Jan; 46(1-3):285-309
• Contact Point Address:
  Waldemar Karwowski, Center for Industrial Ergonomics, University of Louisville, Lutz Hall, Room 445, Louisville, KY 40292
• Email:
  karwowski@louisville.edu
• Federal Fiscal Year:
  2003
• Performing Organization:
  Ohio State University
• Peer Reviewed:
  True
• Start Date:
  20020930
• Source Full Name:
  Ergonomics
• End Date:
  20070929
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:d91943d41597bbac13bc694e1ec22ddc12b471f02eb3ac99918a1916a9e4e759ad223e49622b40f9f10a5bd79a3276d00683d6000b76be7c132279586617c2ea
• Download URL:
  https://stacks.cdc.gov/view/cdc/193795/cdc_193795_DS1.pdf
• File Type:
  [PDF - 249.32 KB ]