Measurements of trunk movements during work

Area of Science:

• Occupational health
• Biomechanics
• Ergonomics

Background:

• Repetitive spinal movements during work can lead to musculoskeletal disorders.
• Understanding trunk flexion patterns is crucial for developing effective workplace interventions.
• Previous studies often relied on self-reporting or limited observational data.

Purpose of the Study:

• To quantify trunk forward flexion and its temporal distribution during work tasks.
• To compare spinal movement patterns across different occupations.
• To identify high-risk flexion behaviors in specific job roles.

Main Methods:

• An adapted, battery-powered instrument was used to continuously measure trunk forward flexion angles and changes.
• The instrument recorded time spent in five 18-degree flexion intervals (0-90 degrees).
• 43 subjects from dentistry, nursing, and warehouse work were monitored during 60-minute work cycles.

Main Results:

• Dentists spent most time (52.2 min) in semi-flexion (≤36 degrees) with 8 deep flexions (>73 degrees).
• Nurses' aides spent 34.4 min upright (0-18 degrees) but performed 70 deep forward flexions.
• Warehouse workers performed 153 deep flexions, primarily during lifting tasks.

Conclusions:

• Occupational demands significantly influence trunk flexion patterns.
• Nurses' aides and warehouse workers exhibit higher frequencies of deep forward flexions compared to dentists.
• The findings highlight the need for targeted ergonomic strategies to mitigate risks associated with specific job tasks.