Gluteal muscle activation during common therapeutic exercises

Area of Science:

• Biomechanics and Exercise Physiology
• Musculoskeletal Rehabilitation

Background:

• Gluteal muscle weakness is linked to lower extremity injuries.
• Therapeutic exercises for gluteal strengthening lack robust scientific evidence on muscle activation.

Purpose of the Study:

• To quantify and compare electromyographic (EMG) signal amplitude of the gluteus maximus and gluteus medius.
• To identify exercises that most effectively recruit these key gluteal muscles.

Main Methods:

• Surface electromyography (EMG) measured gluteal muscle activity in 21 healthy subjects.
• Subjects performed 12 different exercises, with EMG data normalized to maximum voluntary isometric contraction (MVIC).
• Repeated-measures ANOVA compared normalized EMG signal amplitudes across exercises.

Main Results:

• Significant differences in gluteus medius and maximus activation were observed across exercises (P<.0001).
• Side-lying hip abduction yielded the highest gluteus medius activity (81% MVIC).
• Single-limb squats and deadlifts showed similar, high activation for both gluteus medius (approx. 60% MVIC) and gluteus maximus (approx. 59% MVIC).

Conclusions:

• Side-lying hip abduction is optimal for gluteus medius recruitment.
• Single-limb squat and single-limb deadlift are superior for gluteus maximus activation.
• Findings inform clinical decisions on exercise prescription and progression for gluteal rehabilitation and injury prevention.