Comparison of the Effects of Selected Training Methods and SIS Stimulation on Balance, Motor Tests, and Strength

Gdansk University of Physical Education and Sport

Status: Enrolling

Conditions: Hamstring Injury

Treatments: Other: Neuromuscular traning + SIS stimulation; Other: Plyometric traning + SIS stimulation; Other: Super Inductive Stimulation (SIS) Intervention; Other: Nordic Hamstring Exercises + SIS stimulation

Study type: Observational

Funder types: Other

Identifiers

NCT07492732

AWFiS/2025_9_EP

Details and patient eligibility

About

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.

Full 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

Enrollment: 30 estimated patients

Sex: All

Ages: 19 to 40 years old

Volunteers: No Healthy Volunteers

Inclusion criteria

• Healthy individuals aged 19-40,
• Without injuries,
• Physically active persons, athletes.

Exclusion criteria

• 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 design

30 participants in 4 patient groups

Nordic Hamstring Exercises + SIS stimulation

Description:

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.

Treatment:

Other: Nordic Hamstring Exercises + SIS stimulation

Plyometric traning + SIS stimulation

Description:

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.

Treatment:

Other: Plyometric traning + SIS stimulation

Neuromuscular traning + SIS stimulation

Description:

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.

Treatment:

Other: Neuromuscular traning + SIS stimulation

Super Inductive Stimulation (SIS) Intervention

Description:

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.

Treatment:

Other: Super Inductive Stimulation (SIS) Intervention