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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.
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
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| 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. |
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| 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. |
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| 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. |
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Nordic Hamstring Exercises + SIS stimulation | Other | 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. |
| Measure | Description | Time Frame |
|---|---|---|
| Medial-Lateral Stability Index (MLSI) | Assessment of medial-lateral postural stability using a balance platform | Baseline and immediately post-intervention (Week 4) |
| Overall Stability Index (OSI) | Assessment of overall postural stability using a balance platform | Baseline and immediately post-intervention (Week 4) |
| Anteroposterior Stability Index (APSI) | Assessment of anteroposterior postural stability using a balance platform | 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 | Baseline and immediately post-intervention (Week 4) |
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Inclusion Criteria:
Exclusion Criteria:
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Physically active individuals aged 19-40 years, performing a minimum of two training sessions per week.
| Name | Role | Phone | Extension | |
|---|---|---|---|---|
| Ewelina Perzanowska, PhD | Contact | 791597673 | ewelina.perzanowska@awf.gda.pl |
| Name | Affiliation | Role |
|---|---|---|
| Ewelina Perzanowska, PhD | Department of Kinesytherapy | Study Chair |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Gdansk University of Physical Education and Sport | Recruiting | Gdansk | 80-336 | Poland |
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| 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. |
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| Plyometric traning + SIS stimulation | Other | 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. |
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| Neuromuscular traning + SIS stimulation | Other | 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. |
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| Super Inductive Stimulation (SIS) Intervention | Other | uses a high-intensity electromagnetic field (28 kT/s). The stimulus, induced by a coil placed in the applicator, generates depolarization of neuromuscular tissue |
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| ID | Term |
|---|---|
| D008722 | Methods |
| ID | Term |
|---|---|
| D008919 | Investigative Techniques |
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