Short-Term Changes in Upper Extremity Dynamic Mechanical Response Parameters Following Power Hand Tool Use

Details

• Personal Author:
  Radwin RG ; Richard TG ; Sesto ME
• Description:
  Dynamic mechanical response parameters (stiffness, damping and effective mass), physiological properties (strength and swelling) and symptoms of the upper limb were measured before power tool operation, immediately following and 24 h after power tool operation. Tool factors, including peak torque (3 Nm and 9 Nm) and torque build-up time (50 ms and 250 ms), were controlled in a full factorial design. Twenty-nine inexperienced power hand tool users were randomly assigned to one of four conditions and operated a pistol grip nutrunner four times per min for 1 h in the laboratory. Isometric strength decreased immediately following tool use (15%) (p < 0.01) and 24 h later (9%) (p < 0.05). Mechanical parameters of stiffness (p < 0.05) and effective mass (p < 0.05) were affected by build-up time. An average decrease in stiffness (43%) and effective mass (57%) of the upper limb was observed immediately following pistol grip nutrunner operation for the long (250 ms) build-up time. A previously developed biomechanical model was used to estimate handle force and displacement associated with the tool factors in the experiment. The conditions associated with the greatest predicted handle force and displacement had the greatest decrease in mechanical stiffness and effective mass, and the greatest increase in localized discomfort. [Description provided by NIOSH]
• Subjects:
  Biomechanical Phenomena Cumulative Trauma Disorders Ergonomics Laboratories Musculoskeletal Diseases Musculoskeletal System Occupational Health Safety Workplace
• Keywords:
  Biomechanical-modeling Biomechanics Body-mechanics Cumulative-trauma Cumulative-trauma-disorders Hand-tools Human-factors-engineering Injuries Injury-prevention Laboratory-testing Muscle-contraction Muscle-function Muscle-physiology Muscle-stress Muscle-tension Muscles Muscular-disorders Musculoskeletal-system Musculoskeletal-system-disorders Physiological-factors Posture Power-tools Repetitive-work Statistical-analysis Tools Work-environment Work-operations Work-performance Work-practices Worker-health Workplace-monitoring Workplace-studies

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• ISSN:
  0014-0139
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  OSHA Region 5 ; Wisconsin
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  48
• Issue:
  7
• NIOSHTIC Number:
  nn:20028970
• Citation:
  Ergonomics 2005 Jun; 48(7):807-820
• Federal Fiscal Year:
  2005
• Performing Organization:
  University of Wisconsin, Madison
• Peer Reviewed:
  True
• Start Date:
  20020930
• Source Full Name:
  Ergonomics
• End Date:
  20060929
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:7ea6391153e37f5d3791ed2bf9b75cfcff89bb0992df428d7eab3909d15c8ea096ed6289c179b1435b9219eff398329331dc11ceaf7835e40332fc2be0853dd9
• Download URL:
  https://stacks.cdc.gov/view/cdc/190056/cdc_190056_DS1.pdf
• File Type:
  [PDF - 846.71 KB ]