Related Experiment Video
Updated: Sep 2, 2025
08:40
Quantifying Arms and Legs Contributions during Repetitive Electrically-Assisted Sit-To-Stand Exercise in Paraplegics: A Pilot Study
Published on: November 11, 2022
1.2K
Slouched and Erect Sitting Postures Affect Upper Limb Maximum Voluntary Force Levels and Fatiguability: A Randomized
Aurélie Tomezzoli1, Bertrand Fréchède1, Sonia Duprey1
1Laboratoire de Biomécanique et Mécanique des Chocs Univ Lyon, Univ Gustave Eiffel, Univ Claude Bernard Lyon 1, LBMC UMR T_ 9406, F-69622 Lyon, France.
Summary
Maintaining an erect spinal posture improves upper limb strength and endurance. This study shows that spinal posture significantly impacts shoulder and elbow function, crucial for preventing musculoskeletal disorders.
Area of Science:
- Biomechanical Engineering
- Occupational Health
- Ergonomics
Background:
- Upper limb musculoskeletal disorders are often treated by modifying spinal curvature.
- The relationship between spinal posture and upper limb functional capacity requires further biomechanical quantification.
Purpose of the Study:
- To investigate the biomechanical effects of seated spinal posture on upper limb functional capacities.
- To quantify the influence of erect versus slouched postures on muscle strength and fatiguability.
Main Methods:
- An experimental biomechanical study was conducted.
- Isometric maximum voluntary forces (MVFs) of the shoulder, elbow, and wrist were measured.
- Fatiguability was assessed using a repetitive painting task under erect and slouched spinal postures.
Main Results:
- Participants demonstrated higher shoulder and elbow isometric MVF levels in the erect posture.
- An erect spinal posture significantly increased the time to reach a fatigue threshold during repetitive tasks.
- Spinal posture remotely influences upper limb functional capacities, particularly at the shoulder and elbow.
Conclusions:
- Seated spinal posture is a critical factor affecting upper limb functional capacity.
- Ergonomists should integrate spinal posture assessment into strategies for managing upper limb musculoskeletal disorders.
