[Physical workload demands: the combined use of 2 evaluation programs]

Area of Science:

• Occupational Health
• Ergonomics
• Biomechanical Engineering

Background:

• Assessing work-related physical activities is crucial for preventing musculoskeletal injuries.
• Traditional methods for evaluating job demands and energy expenditure can be time-consuming and invasive.
• On-site assessment tools are needed for efficient and accurate risk evaluation in industrial settings.

Purpose of the Study:

• To present a novel computerized methodology for on-site evaluation of work-related physical activities.
• To identify high-risk activities for musculoskeletal injuries.
• To assess the energy expenditure associated with industrial plant workers' tasks.

Main Methods:

• Subjects were videotaped performing work-related activities.
• Heart rate and subjective perception of effort were monitored.
• Videotapes were analyzed using specialized software ('Vision 3000' for injury risk and 'Energy' for energy expenditure).
• Energy expenditure analysis was validated against direct oxygen consumption (VO2) measurements using a portable analyzer ('K2').

Main Results:

• The computerized system effectively identified activities associated with high risk for musculoskeletal injuries.
• Energy expenditure was reliably evaluated using indirect analysis software.
• No statistically significant differences were found between direct VO2 measurements and the indirect energy expenditure estimates.

Conclusions:

• The computerized methodology offers a fast and reliable approach for profiling job requirements and associated musculoskeletal injury risks.
• This on-site evaluation system aids in proactive occupational health and safety management.
• The validated system supports informed decisions for workplace modifications and injury prevention strategies.