Mechanical loading on the low back in three methods of refuse collecting

Area of Science:

• Occupational Health
• Biomechanics
• Ergonomics

Background:

• Refuse collection involves significant mechanical loading on the low back.
• Current methods include polythene bags, mini-containers, and large containers.
• Assessing and mitigating low back stress in refuse collectors is crucial for worker well-being.

Purpose of the Study:

• To evaluate and compare the low back stress associated with three refuse collection methods.
• To quantify spinal compressive and shear forces during typical refuse collection tasks.
• To identify the most ergonomically favorable refuse collection method.

Main Methods:

• Laboratory simulation of prominent refuse collection activities.
• Movement analysis and force measurements to estimate spinal forces.
• Biomechanical modeling and field study data on activity frequency.

Main Results:

• The bag method exhibited high peak forces (compression: 3341–5179 N; shear: 284–673 N) with high frequency.
• The mini-container method showed lower peak forces (compression: 1657–2654 N; shear: 123–248 N) and lower event frequency.
• The large container method presented extremely high peak forces (compression: 4991–5810 N) during kerb surmounting, despite lower activity frequency.

Conclusions:

• Mini-containers are preferable to bags for reducing low back stress in refuse collection.
• Modifications to the large container method (e.g., removing kerbs, two-person teams) could make it a viable alternative.
• Ergonomic improvements in refuse collection methods are essential for preventing occupational low back injuries.