Associations of back muscle endurance with occupational back muscle activity and spinal loading among subsistence farmers and office workers in Rwanda.

Autor: Sibson BE; Department of Human Evolutionary Biology, Harvard University, Cambridge, MA, United States of America., Harris AR; Department of Human Evolutionary Biology, Harvard University, Cambridge, MA, United States of America., Yegian AK; Department of Human Evolutionary Biology, Harvard University, Cambridge, MA, United States of America., Uwimana A; Division of Basic Sciences, University of Global Health Equity, Butaro, Rwanda., Nuhu A; Department of Physiotherapy, University of Rwanda, Kigali City, Rwanda., Thomas A; Institute of Sports Science, University of Lausanne, Lausanne, Switzerland., Anderson DE; Center for Advanced Orthopedic Studies, Beth Israel Deaconess Medical Center, Boston, MA, United States of America.; Department of Orthopedic Surgery, Harvard Medical School, Boston, MA, United States of America., Ojiambo RM; Division of Basic Sciences, University of Global Health Equity, Butaro, Rwanda., Lieberman DE; Department of Human Evolutionary Biology, Harvard University, Cambridge, MA, United States of America.
Jazyk: angličtina
Zdroj: PloS one [PLoS One] 2024 Nov 04; Vol. 19 (11), pp. e0309658. Date of Electronic Publication: 2024 Nov 04 (Print Publication: 2024).
DOI: 10.1371/journal.pone.0309658
Abstrakt: Over the course of the physical activity transition, machines have largely replaced skeletal muscle as the source of work for locomotion and other forms of occupational physical activity in industrial environments. To better characterize this transition and its effect on back muscles and the spine, we tested to what extent typical occupational activities of rural subsistence farmers demand higher magnitudes and increased variability of back muscle activity and spinal loading compared to occupational activities of urban office workers in Rwanda, and whether these differences were associated with back muscle endurance, the dominant risk factor for back pain. Using electromyography, inertial measurement units, and OpenSim musculoskeletal modeling, we measured back muscle activity and spinal loading continuously while participants performed occupational activities for one hour. We measured back muscle endurance using electromyography median frequency analysis. During occupational work, subsistence farmers activate their back muscles and load their spines at 390% higher magnitudes and with 193% greater variability than office workers. Partial correlations accounting for body mass show magnitude and variability response variables are positively associated with back muscle endurance (R = 0.39-0.90 [P < 0.001-0.210] and R = 0.54-0.72 [P = 0.007-0.071], respectively). Body mass is negatively correlated with back muscle endurance (R = -0.60, P = 0.031), suggesting higher back muscle endurance may be also partly attributable to having lower body mass. Because higher back muscle endurance is a major factor that prevents back pain, these results reinforce evidence that under-activating back muscles and under-loading spines at work increases vulnerability to back pain and may be an evolutionary mismatch. As sedentary occupations become more common, there is a need to study the extent to which occupational and leisure time physical activities that increase back muscle endurance helps prevent back pain.
Competing Interests: The authors have declared that no competing interests exist.
(Copyright: © 2024 Sibson et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.)
Databáze: MEDLINE
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