Gender and body height discriminate spinal movement patterns during lifting and lowering tasks

Area of Science:

• Biomechanics
• Ergonomics
• Human Movement Science

Background:

• Spinal movement patterns (SMP) during manual material handling are crucial for injury prevention.
• Existing research often overlooks gender-specific biomechanical differences in lifting tasks.

Purpose of the Study:

• To investigate the relationship between gender, anthropometric factors, and spinal movement patterns (SMP) during lifting and lowering tasks.
• To identify distinct SMPs associated with different lifting techniques and demographic variables.

Main Methods:

• Thirty adults performed box lifting/lowering using freestyle, squat, and stoop techniques with a 15kg box.
• A stepwise segmentation approach and analysis of relative angle inflection points were used to classify SMPs.
• Temporal multi-segmental interactions and their frequencies were analyzed across segments and techniques.

Main Results:

• Spinal movement patterns showed varying associations with gender and anthropometrics during lifting and lowering.
• Females predominantly exhibited a bottom-up SMP during stoop lifting, while males favored a simultaneous pattern.
• Cluster analysis identified a bottom-up thoracic spine pattern as a key differentiator for females.

Conclusions:

• The developed SMP categorization method can differentiate gender-based movement strategies during lifting.
• Findings suggest potential for personalized manual material handling strategies and therapeutic interventions.
• This research offers insights for occupational health, clinical rehabilitation, and sports training programs.