Evaluation of proper height for squatting stool.

Area of Science:

• Ergonomics and Occupational Health
• Musculoskeletal Disorder Prevention
• Industrial Design

Background:

• Squatting postures are common in daily jobs like housekeeping, farming, and welding.
• Prolonged squatting without support may lead to musculoskeletal injuries.
• Identifying optimal ergonomic support is vital for worker well-being.

Purpose of the Study:

• To determine the ideal stool height for squatting workers based on working material position.
• To evaluate user preference and body part discomfort (BPD) associated with different stool heights.
• To suggest ergonomic solutions for reducing physical stress in squatting tasks.

Main Methods:

• 40 college students and 10 female farmers participated in the study.
• Participants evaluated preferred stool heights across three working positions (50 mm, 200 mm, 400 mm).
• User preference was assessed using Likert scales and pairwise ranking; farmers reported BPD.

Main Results:

• Optimal stool height varies with working position: 100-150 mm for <50 mm position, 150 mm for 200 mm position, and 200 mm for 400 mm position.
• Statistical analysis showed comparable results between user preference and BPD measures.
• A wearable chair prototype was developed to enhance mobility and comfort.

Conclusions:

• Recommended stool heights are crucial for mitigating musculoskeletal stress in squatting workers.
• Matching stool height to working position significantly improves comfort and reduces physical strain.
• Ergonomic interventions, like adjustable stools, can promote the health and safety of individuals in squatting occupations.