Effect of seat orientation on ingress/egress joint kinematics and reach envelope

Details

• Personal Author:
  Guffey SE ; Moore CW ; Nimbarte AD ; Ning X ; Rajulu S
• Description:
  BACKGROUND: Little is known about ingress/egress requirements and forward reach for workstations with horizontal seats. This research explored differences between ingress/egress kinematics and reach due to seat orientation. METHODS: 10 participants performed ingress/egress tasks using three seat orientations (horizontal with 90 degree and 120 degree seat angles, and vertical with 90 degree seat angle) and planar reach tasks in three anatomical planes using horizontal and vertical seats with 90 degree seat angle. An optical motion capture system was used to record kinematic data. Marker data was processed and modeled to estimate peak joint angles and ranges of motion of several body joints. For reach tasks, marker data of the clavicle and finger were used to plot reach capacity. RESULTS: Ingress/egress joint kinematics differed greatly between horizontal and vertical seats, while few differences existed between the horizontal seat orientations. Peak angles and ranges of motion during ingress/egress of the horizontal seats were significantly higher than the vertical seats, often by a factor of 3-4. The direction of motion affected several peak angles and ranges of motion, but to a lesser extent than seat orientation. Reach was unaffected by seat orientation. CONCLUSION: This study's findings suggest that ingress/egress of horizontal seats is more stressful for the body, especially the shoulders and lower back, than regular upright seats. [Description provided by NIOSH]
• Subjects:
  Ergonomics Occupational Health Safety Workplace
• Keywords:
  Author Keywords: Egress Equipment Design Humans Ingress Kinematics Reach Envelope Recumbent Seats Seat Designs Work Areas Workers
• ISSN:
  1359-9364
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  OSHA Region 3 ; OSHA Region 6 ; Texas ; West Virginia
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  137-151
• Volume:
  11
• Issue:
  4
• NIOSHTIC Number:
  nn:20049201
• Citation:
  Occup Ergon 2013 Oct; 11(4):137-151
• Contact Point Address:
  Ashish D. Nimbarte, Industrial and Management Systems Engineering, West Virginia University, PO Box 6070, Morgantown, WV 26506-6107
• Email:
  Ashish.Nimbarte@mail.wvu.edu
• Federal Fiscal Year:
  2014
• Performing Organization:
  West Virginia University
• Peer Reviewed:
  True
• Start Date:
  20050701
• Source Full Name:
  Occupational Ergonomics
• End Date:
  20250630
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:784af12342a9566b88c0597654e86113d0a68fc466824e620e630cb013f62fa775d6b9e2b2d9b2f661208739d3728167066317022761c4bee0e0fd78ca00fe08
• Download URL:
  https://stacks.cdc.gov/view/cdc/203734/cdc_203734_DS1.pdf
• File Type:
  [PDF - 2.20 MB ]