The Deflection of Fatigued Neck

Details

• Personal Author:
  Reddy C ; Zhang X ; Zhou Y ; Reddy C ; Zhang X ; Zhou Y
• Description:
  The human neck is a unique mechanical structure, highly flexible but fatigue prone. The rising prevalence of neck pain and chronic injuries has been attributed to increasing exposure to fatigue loading in activities such as prolonged sedentary work and overuse of electronic devices. However, a causal relationship between fatigue and musculoskeletal mechanical changes remains elusive. This work aimed to establish this relationship through a unique experiment design, inspired by a cantilever beam mechanical model of the neck, and an orchestrated deployment of advanced motion-force measurement technologies including dynamic stereo-radiographic imaging. As a group of 24 subjects performed sustained-till-exhaustion neck exertions in varied positions-neutral, extended, and flexed, their cervical spine musculoskeletal responses were measured. Data verified the occurrence of fatigue and revealed fatigue-induced neck deflection which increased cervical lordosis or kyphosis by 4-5 degrees to 11 degrees, depending on the neck position. This finding and its interpretations render a renewed understanding of muscle fatigue from a more unified motor control perspective as well as profound implications on neck pain and injury prevention. [Description provided by NIOSH]
• Subjects:
  Biomechanical Phenomena Fatigue Musculoskeletal Diseases Musculoskeletal System Occupational Health Safety
• Keywords:
  Author Keywords: Cervical Spine Deflection Biomechanical Modeling Biomechanics Dynamic Radiographic Imaging Imaging Techniques MSD Muscle Fatigue Musculoskeletal Disorders Neck Injuries Neck Mechanics
• ISSN:
  0027-8424
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article ; Journal Article
• Place as Subject:
  OSHA Region 6 ; Texas
• CIO:
  National Institute for Occupational Safety and Health (NIOSH) ; National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health ; Workplace Safety & Health
• Location:
  North America ; North America
• Volume:
  121
• Issue:
  34
• NIOSHTIC Number:
  nn:20070012
• Citation:
  Proc Natl Acad Sci U.S.A. 2024 Aug; 121(34):e2401874121
• Contact Point Address:
  Xudong Zhang, Department of Industrial and Systems Engineering, Texas A&M University, College Station, TX 77843
• Email:
  xudongzhang@tamu.edu
• Federal Fiscal Year:
  2024
• Performing Organization:
  Texas Engineering Experiment Station
• Peer Reviewed:
  True
• Start Date:
  20150901
• Source Full Name:
  Proceedings of the National Academy of Sciences of the United States of America
• End Date:
  20190831
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:a0a1104b6a9923715fd63a33252df457968ac8fc70d9c15b867112f4610970e52327890444cea9fce3b6e57ddd0ed264b34e9d6284a763009161b603ef58e40a
• Download URL:
  https://stacks.cdc.gov/view/cdc/208321/cdc_208321_DS1.pdf
• File Type:
  [PDF - 1.48 MB ]