Postural Sway and Joint Kinematics During Quiet Standing Are Affected by Lumbar Extensor Fatigue

Details

• Personal Author:
  Davidson BS ; Madigan ML ; Nussbaum MA
• Description:
  The purpose of this study was to investigate changes in postural sway and strategy elicited by lumbar extensor muscle fatigue. Specifically, changes in center of mass (COM), center of pressure (COP), and joint kinematics during quiet standing were determined, as well as selected cross correlations between these variables that are indicative of movement strategy. Twelve healthy male participants stood quietly both before and after exercises that fatigued the lumbar extensors. Whole-body movement and ground reaction force data were recorded and used to calculate mean body posture and variability of COM, COP, and joint kinematics during quiet standing. Three main findings emerged. First, participants adopted a slight forward lean post-fatigue as evidenced by an anterior shift of the COM and COP. Second, post-fatigue increases in joint angle variability were observed at multiple joints including joints distal to the fatigued musculature. Despite these increases, anterior-posterior (AP) ankle angle correlated well with AP COM position, suggesting the body still behaved similar to an inverted pendulum. Third, global measures of sway based on COM and COP were not necessarily indicative of changes in individual joint kinematics. Thus, in trying to advance our understanding of how localized fatigue affects movement patterns and the postural control system, it appears that joint kinematics and/or multivariate measures of postural sway are necessary. [Description provided by NIOSH]
• Subjects:
  Biomechanical Phenomena Fatigue Musculoskeletal System Occupational Health Safety
• Keywords:
  Author Keywords: Muscle Fatigue Biomechanics Injuries Motion-studies Muscle-function Muscle-physiology Muscles Musculoskeletal-system Postural Balance Posture
• ISSN:
  0167-9457
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  OSHA Region 3 ; Virginia
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  25
• Issue:
  6
• NIOSHTIC Number:
  nn:20031755
• Citation:
  Hum Mov Sci 2006 Dec; 25(6):788-799
• Contact Point Address:
  Department of Mechanical Engineering, Virginia Polytechnic Institute and State University, Mail Code 0238, Blacksburg, VA 24061
• Federal Fiscal Year:
  2007
• Performing Organization:
  Virginia Polytechnic Institute and State University
• Peer Reviewed:
  True
• Start Date:
  20030901
• Source Full Name:
  Human Movement Science
• End Date:
  20080831
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:4d853b4c4300b02dfca26457e0d54c2c4f0734e9c11807b363631b5f894dc1b60dd1f0a2b7a29a17334656c5ea412d55b583fbd7287493dd079a03da67c8468f
• Download URL:
  https://stacks.cdc.gov/view/cdc/185929/cdc_185929_DS1.pdf
• File Type:
  [PDF - 481.51 KB ]