Sex differences in perceived discomfort during seated static posture holding

Area of Science:

• Ergonomics
• Human Factors
• Biomechanics

Background:

• Postural discomfort is a significant factor in workplace productivity and well-being.
• Previous research has not fully explored how sex influences the perception of discomfort during static postures.
• Understanding these differences is crucial for developing effective ergonomic interventions.

Purpose of the Study:

• To investigate the influence of sex on perceived postural discomfort during a seated static posture holding (SPH) task.
• To identify how sex modifies the relationship between biomechanical factors (joint moments, joint angles) and discomfort.
• To provide insights for sex-specific ergonomic assessments.

Main Methods:

• Ten male and ten female participants performed a seated static posture holding (SPH) task under 108 different conditions.
• Subjective discomfort ratings were collected for each condition.
• Regression analysis was used to examine the relationship between biomechanical variables and perceived discomfort, stratified by sex.

Main Results:

• The impact of joint reactive moments on discomfort was greater in females than males.
• The influence of shoulder joint angle on discomfort was more pronounced in males than females.
• Specific task conditions elicited greater discomfort in males, while others were more uncomfortable for females.

Conclusions:

• Sex is a significant moderator of postural discomfort perception during SPH tasks.
• Observed sex differences in discomfort perception are likely related to variations in physical work capacity, including muscular strength and joint flexibility.
• The development of sex-specific posture analysis tools is recommended to enhance the accuracy and precision of ergonomic assessments.