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Método RULA - Ergonautas
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Método RULA - Ergonautas

Understanding Postural Load and Its Impact on Musculoskeletal Disorders

The Risks of Excessive Postural Load

  • Excessive postural load, often due to forced or prolonged static postures, is a significant risk factor for musculoskeletal disorders.
  • Continuous adoption of improper postures leads to fatigue and long-term health issues, highlighting the need for evaluating and reducing postural loads in workplace settings.

Methods for Evaluating Postural Load

  • Various methods exist to assess the risks associated with postural load, differentiated by their application scope (individual vs. group postures) and body parts evaluated.
  • The RULA method (Rapid Upper Limb Assessment), developed in 1993 by McAtamney and Corlett, is widely used for assessing upper limb exposure to high postural loads.

Application of the RULA Method

  • RULA evaluates posture based on factors such as duration, frequency, and forces exerted while maintaining a position; it provides a score indicating whether changes are necessary.
  • While RULA identifies ergonomic problems from excessive postural load, it lacks detailed analysis capabilities regarding movement repetitiveness. Thus, it's primarily used for evaluating forced or static postures only.

Selecting Postures for Evaluation

  • The evaluator must select specific individual postures that exhibit greater loads based on duration or deviation from neutral positions during task observation cycles. Regular intervals can be used if work cycles are lengthy or non-existent.
  • Observing multiple work cycles helps determine which tasks and corresponding postures should be evaluated for potential ergonomic risks.

Measurement Techniques in RULA

  • To apply the RULA method effectively, angular measurements of body parts are essential; these can be taken directly using tools like protractors or through photographs ensuring accurate angle representation.

RULA Method Overview

Understanding RULA's Purpose and Application

  • The RULA (Rapid Upper Limb Assessment) method evaluates the risk of musculoskeletal injuries based on worker posture, with higher scores indicating greater risk.
  • Its primary objective is to assess exposure to risks from inappropriate postures, focusing specifically on upper extremities rather than overall body positions.
  • RULA categorizes the body into two groups: Group A (upper limbs: arms, forearms, wrists) and Group B (legs, trunk, neck), assessing each side separately when necessary.

Steps for Implementing the RULA Method

  • Evaluators should observe work cycles and select postures that present significant postural loads due to duration or frequency of occurrence.
  • Angular measurements are taken using photographs from appropriate angles; both sides of the body are analyzed if there is uncertainty about which side poses a greater risk.

Scoring and Action Levels

  • Scores for each body part are determined using specific tables, leading to partial and final scores that indicate risk levels and necessary actions.
Video description

El método RULA fue desarrollado en 1993 por McAtamney y Corlett, de la Universidad de Nottingham (Institute for Occupational Ergonomics), con el objetivo de evaluar la exposición de los trabajadores a factores de riesgo que originan una elevada carga postural y que pueden ocasionar trastornos en los miembros superiores del cuerpo. Para la evaluación del riesgo se consideran en el método la postura adoptada, la duración y frecuencia de ésta y las fuerzas ejercidas cuando se mantiene. Para una determinada postura RULA obtendrá una puntuación a partir de la cual se establece un determinado Nivel de Actuación. El Nivel de Actuación indicará si la postura es aceptable o en qué medida son necesarios cambios o rediseños en el puesto. En definitiva, RULA permite al evaluador detectar posibles problemas ergonómicos derivados de una excesiva carga postural.