About this trial
This crossover experimental study aims to compare acute hamstring muscle oxygenation responses during Nordic Hamstring Exercise (NHE) and Blood Flow Restriction Nordic Hamstring Exercise (BFR-NHE) in elite adolescent athletes. Participants will complete both exercise conditions in a randomized order separated by a 7-day washout period. Muscle oxygen saturation will be assessed using near-infrared spectroscopy (MOXY), together with total hemoglobin responses, blood lactate concentration, perceived exertion, and exercise performance variables. The findings may improve understanding of the physiological effects of blood flow restriction during eccentric hamstring exercise in adolescent athletes.
Eligibility criteria
Qualifiers
Elite adolescent athletes aged 14 to 18 years.
Licensed athletes with at least 3 years of regular sports participation.
Currently participating in a regular weekly training program.
Physically able to complete the Nordic Hamstring Exercise and study testing protocol.
Disqualifiers
Hamstring injury within the previous 6 months.
Lower extremity surgery within the previous 6 months.
Current lower extremity pain or musculoskeletal injury that may interfere with exercise performance.
Cardiovascular, vascular, neurological, or other medical conditions that may contraindicate blood flow restriction exercise.
Trial design
Treatments tested in this trial
- Nordic Hamstring Exercise
- Blood Flow Restriction Nordic Hamstring Exercise