Perception and biomechanics data in a manual handling task: a comparative study.

Area of Science:

• Ergonomics and Human Factors
• Biomechanics
• Occupational Health

Background:

• Manual material handling (MMH) evaluation often relies on biomechanical data.
• Subjective perception offers a complementary perspective on task exertion and safety.
• Integrating both data types can enhance understanding of MMH risks.

Purpose of the Study:

• To investigate the correlation between subjective perception and biomechanical data in MMH.
• To determine if perception and biomechanics yield similar conclusions regarding task variations.
• To explore how these two approaches can complement each other for a comprehensive evaluation.

Main Methods:

• Eleven subjects performed manual material handling tasks involving 15 kg loads.
• Perception was assessed using the CR-10 scale (Borg 1982) and post-task interviews.
• Biomechanical data, specifically net resulting moment, was collected and correlated with perception data.
• Task variables included free practice, load format (box/cylinder), and off-centre loading.

Main Results:

• The net resulting moment demonstrated the strongest correlation with subjective perception data.
• Physical and performance perception dimensions generally aligned with biomechanical data.
• Perceptions related to the operative dimension showed weaker correlations with biomechanical metrics.
• Both approaches largely agreed on the effects of practice and format, but diverged on the impact of off-centre loading.

Conclusions:

• Subjective perception and biomechanical data offer valuable, yet distinct, insights into manual material handling.
• The net resulting moment is a key biomechanical indicator correlating with perceived exertion.
• Verbal data from interviews provide crucial context for understanding discrepancies between perception and biomechanics.
• Further research should focus on closer integration of perception and biomechanics for improved MMH assessment.