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NCT Number: NCT06953401

Muscle Activity of the Gastrocnemius and Soleus Muscles by Surface Electromyography.

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.

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Key information

Conditions

Muscle Activity Electromyography Lower Limb

Age range

18 year–30 year

Sex eligibility

All sexes

Study type

Observational

Primary location

Centro Universitario de Plasencia

Plasencia, Cáceres, 10600, Spain

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • 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.
  • Not allergic to adhesives.
  • Ability to perform the task without limitation.

•. No high-intensity exercise in the 12 hours before testing

  • Ability to provide informed consent and complete the assessment

Exclusion criteria

  • Reduced lower limb mobility.
  • Neuromuscular or skeletal conditions affecting the calf region.
  • Intense physical activity 12 hours before testing.
  • Lack of informed consent.

Treatment and study plan

Muscle contraction protocol for electromyographic assessment

Other

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.

Primary outcomes

  1. Muscle activation, microvolts (μV)

    Time frame: Baseline or Day 1. During a single assessment session (~30 minutes).

    Muscle activation (μV) as recorded by mDurance® sEMG system during the contraction protocol (soleus vs. gastrocnemius).

Secondary outcomes

  1. RMS (root mean square) and peak EMG signal values (μV)

    Time frame: Baseline or Day 1. During the same assessment session

    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

  2. Differences in muscle activity by contraction type (μV)

    Time frame: Baseline or Day 1. Immediately after the execution of each contraction type during the session

    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

  3. Activity differences by foot posture (pronated, neutral, supinated)

    Time frame: Baseline or Day 1. Immediately after foot posture assessment during the same session

    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.

  4. Correlation with physical activity level Physical Activity Questionnaire (IPAQ-short version)

    Time frame: Baseline or Day 1. Collected at baseline before EMG assessment

    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.

Study contacts

Contact information is provided by the study sponsor or research team.

Raquel MA Dra. Raquel Mayordomo Acevedo, PhD

CONTACT

[email protected]

927427000

Sponsors and collaborators

Lead sponsor

University of Extremadura

Other

Registry information

Official study title

Muscle Activity of the Gastrocnemius and Soleus Muscles During a Specific Contraction Task Assessed by Surface Electromyography

Important dates

Study start
2025
Primary completion
2025
Study completion
2025
First posted
May 1, 2025
Registry last updated
May 1, 2025

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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