An observational study in Muscle Activity, Electromyography and Lower Limb, sponsored by University of Extremadura. Not yet recruiting at 1 site in Spain. Open to participants aged 18 Years to 30 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2025-05-01.
Sponsored by University of Extremadura · Observational
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.
University of Extremadura is the lead sponsor of 48 studies on the registry; 7 are open to participants now.
Counted across the registry records on this site, refreshed daily.
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.
Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
Ability to perform the task without limitation.
•. No high-intensity exercise in the 12 hours before testing
Exclusion Criteria:
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Participants 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.
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).
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 session
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 session
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 session
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 assessment
Plan to share: No
No publications or documents are linked to this record.
Start is estimated for Sep 2025; primary completion for Nov 2025, 2 months later.
How these figures are worked out, and which studies are left out of them.
This study is not yet recruiting, as verified in Apr 2025. You cannot join it, but the record below documents what was studied.
Get an email when the registry record changes — status, dates, results — or when someone posts here.
Sign in to followQuestions and observations about this study, from anyone following it. Not medical advice, and not a channel to the study team — their contact details are on the registry record.
Sign in to join the discussion. Reading takes no account; posting does. You choose a display name, and a pseudonym is the default.
Nothing here yet. If you are running this trial, taking part in it, or weighing whether to, this is the place to say so.
University of Extremadura