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NCT Number: NCT04050813

Efficacy of Flywheel Inertial Resistance Training in the Architecture and Function of the Hamstring

Investigate the efficacy of the inercial Flywheel training protocol in modifying the architecture and function of the hamstrings in patients with a history of structural muscle injury vs conventional training.

The researchers hypothesize that inercial Flywheel training protocol will be a useful strategy in the modification of the architecture and function of the hamstring in patients with a history of indirect structural muscle injury and decrease the recurrence.

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Key information

Conditions

Hamstring Injury

Age range

18 year–50 year

Sex eligibility

Male

Study type

Interventional

Phase

Not applicable

Primary location

Oulton GyMed, Rehabilitación y Gimnasio de Salud

Córdoba, Córdoba Province, 5000, Argentina

About this study

Randomized controlled intervention study

Who can participate

Healthy volunteers accepted: No

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

Inclusion criteria

  • Adults with history of structural muscle injuries type 3 of the Munich Consensus classification for muscular injuries, confirmed by imaging diagnosis no more than 2 years ago.
  • The patient must have performed conventional medical and physiotherapy treatment
  • Have Returned to their usual sporting activity
  • With good mental health.

Exclusion criteria

  • Suffer from a systemic pathology that could alter the healing biology of the muscle.
  • Present other lesions in the muscular group of extrinsic characteristic or not encompassed within type 3 structural lesions such as, for example, proximal or distal insertion tendinopathy, use of semitendinous as anterior cruciate ligament graft.
  • Prior knee or hip surgery.
  • Having been infiltrated with platelet rich plasma in the posterior thigth region in the previus 3 months before startin the study

Treatment and study plan

Exercises program for hamstring architecture and function

Behavioral

To assess the effectiveness of the inertial flywheel resistance program in the architecture and function of the hamstrings post structural hamstring injury

Primary outcomes

  1. Change in the architecture and morphology of the hamstring

    Time frame: 0 and 8 week

    To assess change in architecture and morphology of the hamstring at 8 week. It will be performed by a medical specialist in diagnostic imaging with a A GE Voluson 730 Expert model ultrasound machine , with 6-12 MHz linear transducer. Panoramic images of the long portion of the biceps femoris and semitendinosus will be taken from its proximal insertion, In each muscle, muscle thickness, fascicle length, penetration angle and physiological cross-sectional area will be evaluated.

  2. Change in Maximun isometric strength

    Time frame: 0 and 8 week

    To assess change in maximum isometric strength of hamstring in Newton (N). It will be measured in 3 repetitions with a hand dynamometer at two knee flexion angles.

  3. Change in Rate of force development

    Time frame: 0 and 8 week

    To assess change in rate of force development of hamstring in N/seg at 8 week. it will be measured in 3 repetitions with a hand dynamometer at two knee flexion angles.

  4. Change in Maximun eccentric strength

    Time frame: 0 and 8 week

    To assess the maximum eccentric strength of hamstring in Newton (N) from basiline. It will be measured in 3 repetitions with a hand held dynamometer.

Secondary outcomes

  1. Change in Oslo hamstring injury screening questionnaire

    Time frame: 0 and 8 week

    Self-administered questionnaire. The hamstring injury detection test will be carried out to assess the previous injury, symptoms, function and quality of life of these players with the "Oslo hamstring injury screening questionnaire" questionnaire.This tool is divided in 23 items within 5 categories: symptoms, discomfort, pain depending on daily activity, sports and quality of life for injuries in right or left hamstrings

  2. Functional scale of the lower limb

    Time frame: In the week before the 1st session of the protocol

    Self-reported patient-specific outcome measure assess functional change, primarily in patients presenting with musculoskeletal disorders. Patients are asked to identify up to 3 important activities they are unable to perform or are having difficulty with as a result of their problem. In addition to identifying the activities, patients are asked to rate, on an 11-point scale, the current level of difficulty associated with each activity. Following the intervention, patients are asked again to rate the activities previously identified. the lower limb will be used in its version validated in Argentina

  3. Adverse events

    Time frame: week 8

    To capture all adverse events and side effects that occurred after exercises protocol. Patients reported any changes or any symptoms. If a question was answered "yes", we asked for further comments To capture all adverse events and side effects that occurred after exercises protocol. Patients reported any changes or any symptoms. If a question was answered "yes", we asked for further comments

  4. Adherence self-report questionnaire

    Time frame: week 8

    Patients were asked to choose one of six descriptions (from level 1 = perfect adherence to level 6 = nonadherence) to express exercise treatment at the end of the twelve weeks study period.

  5. Maximum Hip Flexion Active Knee Extension (MHFAKE) Test

    Time frame: 0 and 8 week

    to assess change in amplitude of movement of the hamstring in degrees with inclinometer

  6. Single leg bridge test. Change in resistance of hamstring

    Time frame: 0 and 8 week

    to assess the ability or resistance of the hamstring in repetition numbers

  7. Change in Test of a 1RM eccentric

    Time frame: 0 and 8 week

    To assess the maximun eccentric repetition in a conventional hamstring leg curl in kg

Sponsors and collaborators

Lead sponsor

Universidad Nacional de Córdoba

Other

Collaborators

  • Instituto Oulton

Registry information

Official study title

Efficacy of Flywheel Inertial Resistance Training in the Architecture and Function of the Hamstrings in Athletes with a History of Hamstring Muscle Injury

Important dates

Study start
2019
Primary completion
2022
Study completion
2022
First posted
Aug 8, 2019
Registry last updated
Mar 27, 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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