Examination of hip function and muscle activity during clam exercise

Area of Science:

• Biomechanics
• Exercise Physiology
• Musculoskeletal Research

Background:

• The clam exercise is a widely recognized method for strengthening hip abductor muscles.
• Understanding variations in movement patterns during this exercise is crucial for optimizing its efficacy.

Purpose of the Study:

• To classify the directions of greater trochanter movement during the clam exercise.
• To investigate if these classifications correlate with differences in muscle activation patterns.

Main Methods:

• Twenty healthy males were categorized into three groups based on greater trochanter movement: diagonally upward, backward, and upward.
• Electromyography measured muscle activity (gluteus medius, gluteus maximus, tensor fascia lata, external oblique).
• Greater trochanter movement direction and maximum muscle strength were assessed.

Main Results:

• The diagonally upward group exhibited significantly higher gluteus medius activity compared to other muscles.
• Gluteus medius activity was greater in the diagonally upward and backward groups than in the upward group.
• Muscle activity varied based on the specific direction of greater trochanter movement.

Conclusions:

• The direction of greater trochanter movement influences the tension and action vectors of hip muscles.
• Different clam exercise movement patterns lead to distinct muscle activation profiles around the hip joint.
• Tailoring the clam exercise based on individual movement patterns may enhance gluteus medius activation.