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Published on: September 13, 2024
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The deflection of fatigued neck
Yu Zhou1, Curran Reddy2, Xudong Zhang1,2,3
1Department of Industrial and Systems Engineering, Texas A&M University, College Station, TX 77843.
Summary
Neck fatigue causes measurable changes in cervical spine alignment, increasing lordosis or kyphosis. This study links muscle fatigue to mechanical shifts, offering insights for neck pain and injury prevention.
Area of Science:
- Biomechanics
- Human Physiology
- Musculoskeletal Research
Background:
- Neck pain and chronic injuries are increasingly prevalent, often linked to fatigue loading from sedentary work and device use.
- A direct causal link between muscle fatigue and musculoskeletal changes in the neck remains poorly understood.
- Understanding this relationship is crucial for effective prevention strategies.
Purpose of the Study:
- To establish a causal relationship between muscle fatigue and mechanical changes in the human cervical spine.
- To investigate fatigue-induced alterations in neck posture and alignment.
- To provide a deeper understanding of neck mechanics from a motor control perspective.
Main Methods:
- Utilized a cantilever beam model inspired experimental design for neck mechanics.
- Employed advanced motion-force measurement technologies, including dynamic stereo-radiographic imaging.
- Measured cervical spine musculoskeletal responses in 24 subjects during sustained neck exertions to exhaustion in neutral, extended, and flexed positions.
Main Results:
- Confirmed the occurrence of muscle fatigue during sustained neck exertions.
- Quantified fatigue-induced neck deflection, showing increases in cervical lordosis or kyphosis ranging from 4-5° to 11°.
- Demonstrated a position-dependent effect of fatigue on cervical spine alignment.
Conclusions:
- Muscle fatigue directly induces significant mechanical changes in cervical spine alignment.
- Findings offer a unified motor control perspective on muscle fatigue.
- Results have profound implications for understanding and preventing neck pain and injuries.
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