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The effect of an on-body personal lift assist device (PLAD) on fatigue during a repetitive lifting task
Authors:Christy A. Lotz  Michael J. Agnew  Alison A. Godwin  Joan M. Stevenson
Affiliation:1. School of Kinesiology and Health Studies, Queen’s University, Kingston, ON, Canada K7L 3N6;2. Department of Industrial and Systems Engineering, Virginia Tech, 250 Durham Hall (0118) Blacksburg, VA 24061, USA;3. School of Human Kinetics, Laurentian University, Sudbury, ON, Canada P3E 2C6;1. Department of Industrial and Systems Engineering, Virginia Tech Blacksburg, VA 24061, USA;2. School of Biomedical Engineering and Sciences, Virginia Tech Blacksburg, VA 24061, USA;3. Department of Mechanical Engineering, Virginia Tech Blacksburg, VA 24061, USA;4. Industrial Engineering Department, College of Engineering, King Saud University, Riyadh, Saudi Arabia;5. Department of Industrial and Systems Engineering, Rochester Institute of Technology, Rochester, NY 14623, USA;1. Department of General and Trauma Surgery, BG University Hospital, Bochum, Germany;2. CCR GmbH, Hunscheidtstraße 34, 44789 Bochum, Germany;3. Institute for Prevention and Occupational Medicine of the German Social Accident Insurance, Ruhr-University Bochum (IPA), Bürkle-de-la-Camp Platz 1, 44789 Bochum, Germany;1. Department of Mechanical Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, United States;2. Department of Computer Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, United States;3. Department of Biomedical Engineering and Mechanics, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, United States
Abstract:Occupations demanding frequent and heavy lifting are associated with an increased risk of injury. A personal lift assist device (PLAD) was designed to assist human muscles through the use of elastic elements. This study was designed to determine if the PLAD could reduce the level of general and local back muscle fatigue during a cyclical lifting task. Electromyography of two erector spinae sites (T9 and L3) was recorded during a 45-min lifting session at six lifts/lowers per minute in which male participants (n = 10) lifted a box scaled to represent 20% of their maximum back extensor strength. The PLAD device reduced the severity of muscular fatigue at both muscle sites. RMS amplitude increased minimally (22% and 26%) compared to the no-PLAD condition (104% and 88%). Minimal median frequency decreases (0.33% and 0.41%) were observed in the PLAD condition compared to drops of 12% and 20% in the no-PLAD condition. The PLAD had an additional benefit of minimizing pre–post changes in muscular strength and endurance. The PLAD also resulted in a significantly lower rate of perceived exertion across the lifting session. It was concluded that the PLAD was effective at decreasing the level of back muscular fatigue.
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