Asymmetric Manual Arm Strength Evident Only in Right-Handed Individuals

Area of Science:

• Ergonomics
• Human Factors Engineering
• Biomechanics

Background:

• Assessing arm strength asymmetry is vital for occupational safety.
• Existing digital human models may not fully account for limb strength differences.
• Understanding handedness impacts on strength is key for accurate ergonomic predictions.

Purpose of the Study:

• To quantify the strength difference between the dominant and non-dominant arms.
• To provide data for refining digital human models used in workplace design.
• To ensure ergonomic assessments adequately protect all individuals, regardless of handedness.

Main Methods:

• This study analyzed arm strength capacities.
• Data was collected to identify differences between right and left limbs.
• Statistical analysis was performed on the strength measurements.

Main Results:

• A significant strength advantage of approximately 8% was observed for the right hand compared to the left in right-handed individuals.
• Left-handed individuals exhibited negligible strength differences between their limbs.
• The findings highlight a consistent asymmetry in dominant arm strength.

Conclusions:

• Digital human models should integrate an 8% right-hand strength advantage for right-handed users.
• This adjustment will improve the accuracy of strength capacity predictions in ergonomic modeling.
• The proposed adjustment ensures adequate protection and representation for both right-handed and left-handed workers in occupational settings.