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Methods and limitations of assessing functional work capacity objectively.

A S Jackson1, R M Ross2

  • 1Department of Health and Human Performance, University of Houston, Houston, TX. 77204-5331, USA.

Journal of Back and Musculoskeletal Rehabilitation
|February 28, 2014
PubMed
Summary
This summary is machine-generated.

Assessing worker functional capacity involves various methods, with direct VO2max measurement being most valid but impractical. Common tests include maximal, submaximal, and non-exercise approaches, each with accuracy and safety trade-offs. Low aerobic capacity poses public health risks.

Keywords:
Aerobic capacityErgonomicsFunctional capacityMaterials handlingVOZmax

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Area of Science:

  • Occupational Health and Safety
  • Exercise Physiology
  • Ergonomics

Background:

  • Objective assessment of worker functional capacity is crucial for occupational health and safety.
  • Aerobic capacity (VO2max) and repetitive lifting are key functional parameters.
  • Current assessment methods for VO2max range from direct measurement to indirect estimations.

Purpose of the Study:

  • To examine methods and challenges in objectively assessing worker functional capacity, focusing on VO2max and repetitive lifting.
  • To evaluate the validity, accuracy, and practicality of different VO2max testing protocols.
  • To discuss the implications of established physiological criteria for repetitive lifting on public health.

Main Methods:

  • Review of direct gas analysis for VO2max, maximal exercise tests, submaximal exercise tests, and non-exercise tests.
  • Analysis of physiological criteria (aerobic capacity, energy expenditure) used in the NIOSH lifting equation.
  • Examination of normative VO2max data for industrial worker populations.

Main Results:

  • Direct VO2max measurement is highly valid but rarely feasible in industrial settings.
  • Maximal tests are accurate but require medical supervision; submaximal tests are safer but less accurate.
  • Non-exercise tests offer accuracy comparable to submaximal tests but rely on self-reporting.
  • Established NIOSH criteria for aerobic capacity and energy expenditure may be too low, potentially impacting public health.
  • A significant percentage of industrial workers exhibit low aerobic fitness, posing health risks.
  • Repetitive lifting capacity appears more dependent on strength and fat-free weight than aerobic capacity.

Conclusions:

  • Objective functional capacity assessment requires balancing accuracy, safety, and practicality.
  • Low recommended aerobic fitness levels and prevalent low aerobic capacity in workers highlight public health concerns.
  • While objective measures like aerobic capacity, strength, and fat-free weight are valuable, factors like motivation and pain tolerance can influence results.