Trapezius muscle activity during wall slide exercise: Natural vs corrected head posture

Area of Science:

• Biomechanics
• Exercise Physiology
• Rehabilitation Science

Background:

• Head posture is known to influence muscle activation patterns.
• The specific impact of head posture on trapezius muscle activity during the wall slide exercise remains unexamined.

Purpose of the Study:

• To determine how natural head posture (NHP) versus corrected head posture (CHP) affects trapezius muscle activation levels.
• To analyze the influence of head posture on trapezius muscle activation ratios during the wall slide exercise.

Main Methods:

• A cross-sectional study involving 19 healthy participants (24.84 ± 4.87 years).
• Surface electromyography (EMG) measured upper trapezius (UT), middle trapezius (MT), and lower trapezius (LT) activation.
• Participants performed wall slides with both NHP and CHP, with EMG recorded during ascending, stationary, and descending phases.

Main Results:

• All trapezius muscles showed low activation (<20% MVC) in both head postures.
• Corrected head posture (CHP) significantly increased UT and MT activation compared to NHP (p < 0.01).
• LT activation and UT/MT, UT/LT ratios remained unchanged between head postures (p > 0.05).
• Muscle activation was highest during the ascending phase for all trapezius muscles.

Conclusions:

• Wall slide exercise with corrected head posture (CHP) enhances trapezius muscle activation, particularly UT and MT.
• The ascending phase of the wall slide exercise shows peak trapezius activation.
• CHP during wall slides may improve shoulder rehabilitation efficacy by increasing trapezius activation without altering muscle balance.