This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Isometric Strength During Scaffold End Frame Disassembly
ISSN: 0148-7191, e-ISSN: 2688-3627
Published May 18, 1999 by SAE International in United States
Annotation ability available
Overexertion injuries comprise the largest category of nonfatal injuries among construction workers. These injuries typically occur when the biomechanical stresses associated with tasks such as lifting, carrying, pushing, etc., exceed the worker’s strength capacity. Two studies were conducted to measure the whole-body isometric strength capability of 56 construction workers. The first study examined the effect of four typical postures (2 symmetric lifts and 2 asymmetric lifts) associated with scaffold end frame disassembly. The effect of posture on isometric strength capability was significant; the strength capability ranged from 366 N to 676 N. The second study evaluated the effect of hand separation distance (46 cm, 86.4 cm, and 116.8 cm) and vertical hand placement (knuckle, elbow, and acromial heights) on isometric force during symmetric lifting postures. The interaction effect of hand separation distance - vertical hand placement on isometric strength capability was significant. The strength capability ranged from 334 N to 644 N. The data collected from these two studies are unique from other human strength databases because the data set includes the human strength data while handling large-size materials. This information will be useful for human-modeling software developers to validate their models, and will be invaluable for safety practitioners in designing jobs which will protect workers from injury or fatigue.
- R. Cutlip - National Institute for Occupational Safety and Health, Division of Safety Research
- H. Hsiao - National Institute for Occupational Safety and Health, Division of Safety Research
- J. Myers - National Institute for Occupational Safety and Health, Division of Safety Research
- E. Becker - West Virginia University
- R. Garcia - West Virginia University
CitationCutlip, R., Hsiao, H., Myers, J., Becker, E. et al., "Isometric Strength During Scaffold End Frame Disassembly," SAE Technical Paper 1999-01-1907, 1999, https://doi.org/10.4271/1999-01-1907.
- Ayoub, M. McDaniel, J. 1974 Effects of Operators Stance on Pushing and Pulling Tasks
- AHE Transactions, 6 185 195
- Caldwell, L.S. Chaffin, D.B. Dukes-Dobos, F.N. Kroemer, K.H.E. Laubach, L.L. Snook, S.H. Wasserman, D. E. 1974 A Proposed Standard Procedure for Static Muscle Strength Testing American Industrial Hygiene Association Journal 35 4 201 206
- Chaffin, D.B. 1974 Human Strength Capability and Low Back Pain J Occup Med 16 248 254
- Chaffin, D.B. Anderson, G.B.J. 1984 Occupational Biomechanics Wiley NY
- Chaffin, D.B. Herrin, G.D. Keyserling, W.M. 1978 Preemployment Strength Testing Journal of Occupational Medicine 20 403 408
- Chaffin, D.B. Herrin, G.D. Keyserling, W.M. Foulke, J.A. 1977 Pre-Employment Strength Testing in Selecting Workers for Materials Handling Jobs NIOSH Publication CDC-99-74-62
- Davis, P.W. Stubbs, D.A. 1980 Force Limits in Manual Work IPC Science and Technology Press Guilford
- Garg, A. Badger, D. 1986 Maximum Acceptable Weights and Maximum Voluntary Isometric Strengths for Asymmetric Lifting Ergonomics 29 7 879 892
- Hsiao, H. Stanevich, R. 1996 Biomechanical Evaluation of Scaffold Handling Tasks International Journal of Industrial Ergonomics 18 407 415
- Keyserling, W. Herrin, G.D. Chaffin, D.B. 1980 Isometric Testing as a Means of Controlling Medical Incidents on Strenuous Jobs J Occup Med 22 332 336
- Kroemer, K.H.E. 1974 Designing for Muscular Strength of Various Populations. AMRL-TR-62-46, Wright Patterson Air Force Base OH
- Kumar, S. Garand, D. 1988 Effect of Posture on Back Strength. Proceedings of the 21 st Annual Meeting of the Human Factors Association of Canada, 183 186
- National Constructors Association 1985 An Assessment of Carpenter Injury Risks Needing Research. NIOSH Unpublished Contract Report.
- Pytel, J.L. Kamon, E. 1981 Dynamic Strength Test as a Predictor for Maximal and Acceptable Lifting Ergonomics 24 663 672
- Snook, S.H. 1978 The Design of Manual Materials Handling Tasks Ergonomics 21 12 963 985
- U.S. Department of Labor 1996 Occupational Injuries and Illnesses in the United States by Industry. Bureau of Labor Statistics Bulletin 2399, U.S. Department of Labor, Washington, D.C.
- Zeh, J Hansson, T Bigos, S. Spengler, D. Battie, D. Wortley, M. 1986 Isometric Strength Testing Spine 11 43 46