Sex Differences in Rotator Cuff Muscles' Response to Various Work-Related Factors

Area of Science:

• Occupational Health
• Biomechanics
• Musculoskeletal Research

Background:

• Rotator cuff injuries are common and costly in the workforce.
• Limited understanding exists regarding sex-based differences in rotator cuff muscle function under occupational exertion.
• Knowledge gaps persist concerning strength, endurance, perceived exertion, and electromyographic responses.

Purpose of the Study:

• To investigate sex differences in rotator cuff muscle strength, endurance, perceived exertion, and electromyographic activity.
• To compare responses of the supraspinatus, infraspinatus, and teres minor muscles between males and females.
• To provide baseline data for ergonomic assessments and workplace task design.

Main Methods:

• Evaluated muscle-specific maximal and submaximal exertions.
• Measured strength, endurance, perceived exertion, and electromyography (EMG).
• Compared data between male and female workers.

Main Results:

• Females exhibited significantly lower muscle strength and endurance compared to males.
• Females demonstrated higher muscle activity (EMG) and perceived exertion levels.
• Significant sex-based differences were observed across tested rotator cuff muscles.

Conclusions:

• Findings highlight crucial sex differences in rotator cuff muscle responses to exertion.
• Data can inform ergonomic interventions to prevent injurious stress in physically demanding tasks.
• Establishes essential population norms for improved workplace design and injury prevention strategies.