Muscle Activity of the Gastrocnemius and Soleus Muscles by Surface Electromyography.
Trial statusNot yet recruiting
Trial phaseNot listed
Trial typeObservational
Biological sexAll
Age18-30
SponsorUniversity of Extremadura
About this trial
This cross-sectional, comparative study aims to evaluate and compare the surface electromyographic (sEMG) activity of the gastrocnemius (medial and lateral) and soleus muscles during static and dynamic contraction tasks. Participants will perform three tests-resting state, isometric, concentric, and eccentric contraction, and dynamic gait-with bilateral measurements. A subgroup analysis will examine muscle activity variations based on foot posture, using the Foot Posture Index (FPI). The study uses the validated mDurance® sEMG system to obtain objective data under controlled lab conditions. The findings will enhance understanding of the functional role of each muscle and could inform rehabilitation and injury prevention strategies.
Eligibility criteria
This trial accepts healthy volunteersQualifiers
Age between 18 and 30 years.
No history of severe musculoskeletal disorders in the lower limbs.
No recent surgery or injury in the last 6 months.
No dermatological conditions affecting electrode placement.
Disqualifiers
Reduced lower limb mobility.
Neuromuscular or skeletal conditions affecting the calf region.
Intense physical activity 12 hours before testing.
Lack of informed consent.
Trial population
The study population will consist of healthy young adults enrolled in undergraduate programs at the Centro Universitario de Plasencia, University of Extremadura (Spain). Participants will be recruited through internal communication channels at the university. All participants will voluntarily agree to take part in the study and sign an informed consent form. Eligibility criteria include individuals aged 18 to 30 years, with no history of recent musculoskeletal injuries or surgeries in the lower limbs, and able to perform the required physical tasks without restriction. Subjects with foot postural alterations will also be included for later comparison with subjects without foot postural alterations.
Trial design
Design model
Other
Time perspective
Cross-sectional
Treatments tested in this trial
Muscle contraction protocol for electromyographic assessment
Other interventionParticipants will perform a set of standardized lower limb muscle contractions (isometric, concentric, and eccentric) involving the gastrocnemius and soleus muscles while lying on an examination table and in standing position both static and dynamic as well as walking. Surface electromyography (mDurance® sEMG system) will be used to record muscle activation during each phase. The task is designed for physiological measurement only and does not constitute a therapeutic intervention. Protocol includes 3 trials per muscle and side, using standardized test conditions.
Treatment groups
No treatment groups listed
Trial outcomes
Primary outcomes
1
Muscle activation, microvolts (μV)
Muscle activation (μV) as recorded by mDurance® sEMG system during the contraction protocol (soleus vs. gastrocnemius).
Time frame
Baseline or Day 1. During a single assessment session (~30 minutes).Secondary outcomes
1
RMS (root mean square) and peak EMG signal values (μV)
RMS and peak EMG signal values (μV): average muscle activity measured by RMS (root mean square) and maximum voluntary contraction by peak activation. Comparison of Medial vs. Lateral Gastrocnemius Activation. Comparison of Medial vs. Lateral Gastrocnemius Activation
Time frame
Baseline or Day 1. During the same assessment session2
Differences in muscle activity by contraction type (μV)
Differences in muscle activity by contraction type (μV): Effect of contraction type (isometric/concentric/eccentric) on muscle activity. Comparison of Medial vs. Lateral Gastrocnemius Activation
Time frame
Baseline or Day 1. Immediately after the execution of each contraction type during the session3
Activity differences by foot posture (pronated, neutral, supinated)
Muscle activation of the gastrocnemius and soleus will be compared based on foot posture (pronated, neutral, or supinated). This aims to identify whether foot type influences activation patterns.
Time frame
Baseline or Day 1. Immediately after foot posture assessment during the same session4
Correlation with physical activity level Physical Activity Questionnaire (IPAQ-short version)
Correlation with physical activity level (IPAQ-short version): Correlation with sociodemographic and anthropometric factors (age, sex, BMI, activity level). Self-reported questionnaire assessing physical activity over the last 7 days. Physical activity is categorized as Low, Moderate, or High based on total MET-minutes/week. Sitting time is recorded separately as an indicator of sedentary behavior.
Time frame
Baseline or Day 1. Collected at baseline before EMG assessmentSponsors and contacts
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Source ClinicalTrials.gov
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