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

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.

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

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.