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Gastrocnemius Neuromuscular Activation During Standing Explosive Acceleration.
Ana Ferri-Caruana1, Carlos Sendra-Pérez2,3, Jose Ignacio Priego-Quesada2,4
1Prevention and Health in Exercise and Sport (PHES) Research Group, Department of Physical Education and Sports, University of Valencia, 46010 Valencia, Spain.
Life (Basel, Switzerland)
|November 27, 2024
Summary
The medial gastrocnemius (MG) activates earlier and contracts longer than the lateral gastrocnemius (LG) in the first foot contact of explosive starts. The third foot contact shows distinct neuromuscular activation patterns for both muscles.
Area of Science:
- Sports Medicine
- Biomechanics
- Human Physiology
Background:
- The gastrocnemius muscle is vital for explosive movements in sports and has a high injury rate, particularly the medial gastrocnemius (MG).
- Understanding neuromuscular activation differences between the medial gastrocnemius (MG) and lateral gastrocnemius (LG) is crucial for injury prevention and performance enhancement in athletes.
Purpose of the Study:
- To compare the neuromuscular activation patterns of the medial gastrocnemius (MG) and lateral gastrocnemius (LG) during the initial foot contacts of a standing explosive acceleration.
- To investigate the timing, peak activity, and duration of muscle contractions for the MG and LG during a simulated sports-specific movement.
Main Methods:
- Electromyography (EMG) analysis was performed on 42 physically active participants (34 males, 8 females).
- Participants underwent EMG assessment of the MG and LG during the first four foot contacts of a standing explosive acceleration, simulating a sports false start.
- Statistical analysis compared neuromuscular activation parameters between the MG and LG across different foot contacts.
Main Results:
- The third foot contact demonstrated significantly different neuromuscular activation between the LG and MG.
- The lateral gastrocnemius (LG) showed earlier activation and higher peak EMG activity compared to the medial gastrocnemius (MG) during the third foot contact.
- The medial gastrocnemius (MG) exhibited longer contraction durations across all foot contacts, except for the third contact, where patterns differed.
Conclusions:
- The medial gastrocnemius (MG) displays earlier activation and longer contraction duration than the lateral gastrocnemius (LG) in the initial foot contact of explosive accelerations.
- The third foot contact represents a unique phase with distinct neuromuscular activation dynamics between the medial gastrocnemius (MG) and lateral gastrocnemius (LG) compared to other contacts.
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