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.
Healthy individuals aged 19-40,
Without injuries,
Physically active persons, athletes.
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,
Physically active individuals aged 19-40 years, performing a minimum of two training sessions per week.
Other
Other
Nordic Hamstring Exercises + SIS stimulation
Other interventionNordic 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 stimulation
Other interventionThe 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 stimulation
Other interventionThe 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) Intervention
Other interventionuses a high-intensity electromagnetic field (28 kT/s). The stimulus, induced by a coil placed in the applicator, generates depolarization of neuromuscular tissue
Medial-Lateral Stability Index (MLSI)
Assessment of medial-lateral postural stability using a balance platform
Overall Stability Index (OSI)
Assessment of overall postural stability using a balance platform
Anteroposterior Stability Index (APSI)
Assessment of anteroposterior postural stability using a balance platform
Maximal hamstring muscle strength
Maximal voluntary strength of the hamstring muscles will be assessed bilaterally using a standardized strength testing protocol
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