Hamstring InjuryNCT07492732
Comparison of the Effects of Selected Training Methods and SIS Stimulation on Balance, Motor Tests, and Strength
An observational study of Hamstring Injury, run by Gdansk University of Physical Education and Sport at 1 site in Poland.
Trial summary
The purpose of this study is to evaluate the effects of four-week training interventions-Nordic Hamstring Exercise, plyometric training, and neuromuscular training-combined with Super Inductive Stimulation (SIS) on hamstring muscle strength, balance, and motor performance. Read more about this study
- Who is it for?
- Ages 19 to 40 years
- Conditions the study is for
- Hamstring Injury
- What is being tested?
- Nordic Hamstring Exercises + SIS stimulation, Plyometric traning + SIS stimulation and Neuromuscular traning + SIS stimulation
- How many people
- 30 participants
- Where
- 1 sitePoland
- Study dates
- 15 Mar 2025to 1 May 2026
- Phase
- Observational
- Are there results?
- Not yet: the study is under way
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 19 to 40 years
- All sexes
- Adult
Study population: Physically active individuals aged 19-40 years, performing a minimum of two training sessions per week.
Who may be able to join
- Healthy individuals aged 19-40,
- Without injuries,
- Physically active persons, athletes.
Who cannot join
- periods of peak training load specific to the athlete's discipline,
- evidence of overload-related pathology in the knee, hip, or lumbosacral joints,
- the presence of any pain symptoms,
- clinically relevant muscle fatigue or indicators of overtraining,
- engagement in strength-based sports within several weeks preceding competition,
- active inflammatory conditions involving osseous, articular, or ligamentous structures of the lower limbs,
- a history of injury or surgical intervention within the 6 months prior to the study intervention.
Trial locations and contacts
1 site in 1 country. Contact the study team or a site near you to ask about taking part.
Poland1 site, 1 recruiting
- Recruiting
Gdansk University of Physical Education and Sport
Gdansk, 80-336
Ewelina Perzanowska, PhD, 791597673, ewelina.perzanowska@awf.gda.pl
About this study
Official title: Comparison of the Effects of Selected Training Methods (Neuromuscular Training, Plyometric Training, and Nordic Hamstring Exercise) and SIS Stimulation on Balance, Motor Performance Tests, and Lower Limb Strength
The purpose of this study is to evaluate the effects of four-week training interventions-Nordic Hamstring Exercise, plyometric training, and neuromuscular training-combined with Super Inductive Stimulation (SIS) on hamstring muscle strength, balance, and motor performance.
Read the detailed description
This randomized controlled study evaluates the effects of three four-week training interventions-Nordic Hamstring Exercise, plyometric training, and neuromuscular training-performed alone or in combination with Super Inductive Stimulation (SIS) in physically active adults.
The study is conducted in three independent stages, each corresponding to a specific training modality. Within each stage, participants are randomly allocated to one of four parallel groups: (1) training combined with SIS, (2) training only, (3) SIS only, or (4) control (no change in habitual physical activity). This design enables assessment of both isolated and combined effects of exercise and electromagnetic stimulation.
All interventions are delivered over a four-week period under supervision. Training protocols are standardized and specific to the intervention type, targeting eccentric strength (Nordic Hamstring Exercise), explosive performance (plyometric training), or neuromuscular control (neuromuscular training).
SIS is applied to the hamstring muscle group using a high-intensity electromagnetic stimulation device, with standardized parameters across participants.
A familiarization phase is conducted prior to the intervention to ensure consistency in procedures. Adherence and protocol compliance are monitored throughout the study.
This study aims to determine the relative and combined effectiveness of these interventions in improving neuromuscular performance in physically active individuals
- Conditions
- Hamstring Injury
- Being tested
- Nordic Hamstring Exercises + SIS stimulation, Plyometric traning + SIS stimulation, Neuromuscular traning + SIS stimulation, Super Inductive Stimulation (SIS) Intervention
- Keywords
- plyometric, neuromuscular
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Nordic Hamstring Exercises + SIS stimulationOther
Nordic Hamstring Exercise training lasts 4 weeks, during which the participant performs 3 sets, each consisting of 3 repetitions of the NHE. After each set, a 2-minute passive rest period follows, during which the participant recovers. In the first week, the participant trains under the supervision of the instructor, while in the following three weeks the exercises are performed at home after prior instruction.
Plyometric traning + SIS stimulationOther
The intervention lasts 4 weeks, during which participants train three times per week. The program consists of single-leg and double-leg jumps, vertical jumps, lateral jumps, and forward jumps, all performed on a stable surface. A principle of progressive overload is applied, with gradual increases in training intensity, volume, and jump height. The progression begins with lower intensity exercises, single-joint movements, and less complex techniques, and advances to higher intensity exercises, multi-joint movements, and more complex techniques.
Neuromuscular traning + SIS stimulationOther
The intervention lasts 4 weeks, with participants training three times per week. The program focuses on improving dynamic stability and incorporates the use of BOSU equipment. Exercises include multitask movements performed on unstable surfaces as well as exercises with eyes closed. During the first week, exercises are performed on a stable surface to improve balance while standing on one leg with eyes open and closed. In the following weeks, exercises on unstable surfaces are introduced, emphasizing the maintenance of proper posture on either one or both legs during multitask activities. In the third week, dynamic exercises on unstable surfaces are added, such as single-leg squats. In the final week, jumps and hops are incorporated. To further increase difficulty, additional load is introduced in the form of medicine balls weighing between 2 and 8 kilograms.
Super Inductive Stimulation (SIS) InterventionOther
uses a high-intensity electromagnetic field (28 kT/s). The stimulus, induced by a coil placed in the applicator, generates depolarization of neuromuscular tissue
| Study group | Role | What they receive |
|---|---|---|
| Nordic Hamstring Exercises + SIS stimulation | The participants will be randomly assigned to four research groups. The first research group will undergo a four-week Nordic Hamstring Exercise training program combined with Super Inductive Stimulation applied to the hamstring muscle group. The second research group will perform a four-week Nordic Hamstring Exercise training program. The third research group will undergo a four-week series of Super Inductive Stimulation sessions applied to the hamstring muscle group. The fourth group, which will serve as the control group, will not change their physical activity habits. Receives: Other: Nordic Hamstring Exercises + SIS stimulation | |
| Plyometric traning + SIS stimulation | The participants will be randomly assigned to four research groups. The first research group will undergo a four-week plyometric training program combined with Super Inductive Stimulation applied to the hamstring muscle group. The second research group will perform a four-week plyometric training program. The third research group will undergo a four-week series of Super Inductive Stimulation sessions applied to the hamstring muscle group. The fourth group, which will serve as the control group, will not change their physical activity habits. Receives: Other: Plyometric traning + SIS stimulation | |
| Neuromuscular traning + SIS stimulation | The participants will be randomly assigned to four research groups. The first research group will undergo a four-week neuromuscular training program combined with Super Inductive Stimulation applied to the hamstring muscle group. The second research group will perform a four-week neuromuscular training program. The third research group will undergo a four-week series of Super Inductive Stimulation sessions applied to the hamstring muscle group. The fourth group, which will serve as the control group, will not change their physical activity habits. Receives: Other: Neuromuscular traning + SIS stimulation | |
| Super Inductive Stimulation (SIS) Intervention | Super Inductive Stimulation (SIS) uses a high-intensity electromagnetic field (28 kT/s). The stimulus, induced by a coil placed in the applicator, generates depolarization of neuromuscular tissue. As a result, SIS evokes an action potential in the neuromuscular tissue, leading to the strengthening of weakened muscles. Due to the methodology of this intervention, the procedures are performed once per week over a period of 4 weeks. Receives: Other: Super Inductive Stimulation (SIS) Intervention |
What is being measured
The primary outcome is the main question the study is designed to answer.
Medial-Lateral Stability Index (MLSI)
Assessment of medial-lateral postural stability using a balance platform
Measured: Baseline and immediately post-intervention (Week 4)
Overall Stability Index (OSI)
Assessment of overall postural stability using a balance platform
Measured: Baseline and immediately post-intervention (Week 4)
Anteroposterior Stability Index (APSI)
Assessment of anteroposterior postural stability using a balance platform
Measured: Baseline and immediately post-intervention (Week 4)
Maximal hamstring muscle strength
Maximal voluntary strength of the hamstring muscles will be assessed bilaterally using a standardized strength testing protocol
Measured: Baseline and immediately post-intervention (Week 4)
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted25 Mar 2026
- Study start15 Mar 2025
- Primary completion1 May 2026 (estimated)
- Study completion1 May 2026 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Hamstring InjuryStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Observational
- Observational model
- Other
- Time perspective
- Other
- Enrolment
- 30 participants (estimated)
Sponsor and investigators
- Lead sponsor
- Gdansk University of Physical Education and Sport
- Sponsor type
- University, hospital or other
- Responsible party
- Principal investigator, Ewelina Perzanowska, Gdansk University of Physical Education and Sport
- Investigators
- Ewelina Perzanowska, PhD, Study chair, Department of Kinesytherapy
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT07492732
- Sponsor's protocol ID
- AWFiS/2025_9_EP
- Status last verified
- Mar 2026
- First submitted
- 11 Sep 2025
- Last updated
- 25 Mar 2026
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- No
Study at a glance
From the registry record, last updated by the sponsor on 25 Mar 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Comparison of the Effects of Selected Training Methods (Neuromuscular Training, Plyometric Training, and Nordic Hamstring Exercise) and SIS Stimulation on Balance, Motor Performance Tests, and Lower Limb Strength
- ClinicalTrials.gov ID
- NCT07492732
- Acronym / sponsor ID
- AWFiS/2025_9_EP
- Conditions
- Hamstring Injury
- Keywords
- plyometric, neuromuscular
- Study type
- Observational
- Recruitment status
- Recruiting
- Enrolment
- 30 participants (estimated)
- Lead sponsor
- Gdansk University of Physical Education and SportUniversity, hospital or other
- Study start
- 15 Mar 2025 (actual)
- Primary completion
- 1 May 2026 (estimated)
- Study completion
- 1 May 2026 (estimated)
- First posted
- 25 Mar 2026 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
The purpose of this study is to evaluate the effects of four-week training interventions-Nordic Hamstring Exercise, plyometric training, and neuromuscular training-combined with Super Inductive Stimulation (SIS) on hamstring muscle strength, balance, and motor performance.
Detailed description
This randomized controlled study evaluates the effects of three four-week training interventions-Nordic Hamstring Exercise, plyometric training, and neuromuscular training-performed alone or in combination with Super Inductive Stimulation (SIS) in physically active adults.
The study is conducted in three independent stages, each corresponding to a specific training modality. Within each stage, participants are randomly allocated to one of four parallel groups: (1) training combined with SIS, (2) training only, (3) SIS only, or (4) control (no change in habitual physical activity). This design enables assessment of both isolated and combined effects of exercise and electromagnetic stimulation.
All interventions are delivered over a four-week period under supervision. Training protocols are standardized and specific to the intervention type, targeting eccentric strength (Nordic Hamstring Exercise), explosive performance (plyometric training), or neuromuscular control (neuromuscular training).
SIS is applied to the hamstring muscle group using a high-intensity electromagnetic stimulation device, with standardized parameters across participants.
A familiarization phase is conducted prior to the intervention to ensure consistency in procedures. Adherence and protocol compliance are monitored throughout the study.
This study aims to determine the relative and combined effectiveness of these interventions in improving neuromuscular performance in physically active individuals
Study design
- Observational model
- Other
- Time perspective
- Other
- Number of arms
- 4
| Arm | Type | Receives |
|---|---|---|
| Nordic Hamstring Exercises + SIS stimulation | – | Other: Nordic Hamstring Exercises + SIS stimulationThe participants will be randomly assigned to four research groups. The first research group will undergo a four-week Nordic Hamstring Exercise training program combined with Super Inductive Stimulation applied to the hamstring muscle group. The second research group will perform a four-week Nordic Hamstring Exercise training program. The third research group will undergo a four-week series of Super Inductive Stimulation sessions applied to the hamstring muscle group. The fourth group, which will serve as the control group, will not change their physical activity habits. |
| Plyometric traning + SIS stimulation | – | Other: Plyometric traning + SIS stimulationThe participants will be randomly assigned to four research groups. The first research group will undergo a four-week plyometric training program combined with Super Inductive Stimulation applied to the hamstring muscle group. The second research group will perform a four-week plyometric training program. The third research group will undergo a four-week series of Super Inductive Stimulation sessions applied to the hamstring muscle group. The fourth group, which will serve as the control group, will not change their physical activity habits. |
| Neuromuscular traning + SIS stimulation | – | Other: Neuromuscular traning + SIS stimulationThe participants will be randomly assigned to four research groups. The first research group will undergo a four-week neuromuscular training program combined with Super Inductive Stimulation applied to the hamstring muscle group. The second research group will perform a four-week neuromuscular training program. The third research group will undergo a four-week series of Super Inductive Stimulation sessions applied to the hamstring muscle group. The fourth group, which will serve as the control group, will not change their physical activity habits. |
| Super Inductive Stimulation (SIS) Intervention | – | Other: Super Inductive Stimulation (SIS) InterventionSuper Inductive Stimulation (SIS) uses a high-intensity electromagnetic field (28 kT/s). The stimulus, induced by a coil placed in the applicator, generates depolarization of neuromuscular tissue. As a result, SIS evokes an action potential in the neuromuscular tissue, leading to the strengthening of weakened muscles. Due to the methodology of this intervention, the procedures are performed once per week over a period of 4 weeks. |
Who may qualify
- Ages
- 19 to 40 years
- Sex
- All
- Age groups
- Adult
- Study population
- Physically active individuals aged 19-40 years, performing a minimum of two training sessions per week.
Key inclusion criteria (3 listed)
- Healthy individuals aged 19-40,
- Without injuries,
- Physically active persons, athletes.
Key exclusion criteria (7 listed)
- periods of peak training load specific to the athlete's discipline,
- evidence of overload-related pathology in the knee, hip, or lumbosacral joints,
- the presence of any pain symptoms,
- clinically relevant muscle fatigue or indicators of overtraining,
- engagement in strength-based sports within several weeks preceding competition,
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Nordic Hamstring Exercises + SIS stimulationNordic Hamstring Exercise training lasts 4 weeks, during which the participant performs 3 sets, each consisting of 3 repetitions of the NHE. After each set, a 2-minute passive rest period follows, during which the participant recovers. In the first week, the participant trains under the supervision of the instructor, while in the following three weeks the exercises are performed at home after prior instruction. | Other | Nordic Hamstring Exercises + SIS stimulation |
| Plyometric traning + SIS stimulationThe intervention lasts 4 weeks, during which participants train three times per week. The program consists of single-leg and double-leg jumps, vertical jumps, lateral jumps, and forward jumps, all performed on a stable surface. A principle of progressive overload is applied, with gradual increases in training intensity, volume, and jump height. The progression begins with lower intensity exercises, single-joint movements, and less complex techniques, and advances to higher intensity exercises, multi-joint movements, and more complex techniques. | Other | Plyometric traning + SIS stimulation |
| Neuromuscular traning + SIS stimulationThe intervention lasts 4 weeks, with participants training three times per week. The program focuses on improving dynamic stability and incorporates the use of BOSU equipment. Exercises include multitask movements performed on unstable surfaces as well as exercises with eyes closed. During the first week, exercises are performed on a stable surface to improve balance while standing on one leg with eyes open and closed. In the following weeks, exercises on unstable surfaces are introduced, emphasizing the maintenance of proper posture on either one or both legs during multitask activities. In the third week, dynamic exercises on unstable surfaces are added, such as single-leg squats. In the final week, jumps and hops are incorporated. To further increase difficulty, additional load is introduced in the form of medicine balls weighing between 2 and 8 kilograms. | Other | Neuromuscular traning + SIS stimulation |
| Super Inductive Stimulation (SIS) Interventionuses a high-intensity electromagnetic field (28 kT/s). The stimulus, induced by a coil placed in the applicator, generates depolarization of neuromuscular tissue | Other | Super Inductive Stimulation (SIS) Intervention |
Primary outcome
Medial-Lateral Stability Index (MLSI)
Time frame: Baseline and immediately post-intervention (Week 4)
Assessment of medial-lateral postural stability using a balance platform
Overall Stability Index (OSI)
Time frame: Baseline and immediately post-intervention (Week 4)
Assessment of overall postural stability using a balance platform
Anteroposterior Stability Index (APSI)
Time frame: Baseline and immediately post-intervention (Week 4)
Assessment of anteroposterior postural stability using a balance platform
Maximal hamstring muscle strength
Time frame: Baseline and immediately post-intervention (Week 4)
Maximal voluntary strength of the hamstring muscles will be assessed bilaterally using a standardized strength testing protocol
Results and safety
This study is still under way. Results are not available in the source record yet.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 25 Mar 2026.
- Individual participant dataSharing planned: No
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part.
Ewelina Perzanowska, PhD study chair
Department of Kinesytherapy
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
An observational study of Hamstring Injury, run by Gdansk University of Physical Education and Sport at 1 site in Poland.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 3 inclusion and 7 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: looking for participants now, as of the sponsor's last update on 25 Mar 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in Poland. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
This study is still under way. Results are not available in the source record yet.
How can a doctor refer a patient or contact the research team?
Contact Ewelina Perzanowska, PhD (791597673, ewelina.perzanowska@awf.gda.pl), or a site near the patient. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Medial-Lateral Stability Index (MLSI) (time frame: Baseline and immediately post-intervention (Week 4)). The study lists 4 primary outcomes in all. It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 25 Mar 2026.