Velocity-regulated Jump-squat Training and 15-m Swimming Start Performance in Youth Swimmers

This study aims to examine the effects of a structured swimming training intervention on sport performance-related outcomes in 14- to 15-year-old federated swimmers from Club Huracanes. The study will use a single-group pre-post field design. Participants will complete baseline assessments before the intervention and post-intervention assessments after the final training week. The intervention will be integrated into the regular training process and will be supervised by the coaching and research team. Outcomes will include swimming performance-related measures and adherence to the intervention. Safety will be monitored throughout the study, and any adverse events or musculoskeletal complaints will be recorded. Written informed consent from parents or legal guardians and assent from the athletes will be required before participation.

Inclusion Criteria: * Federated youth swimmers belonging to Club Huracanes. * Aged 13 to 14 years at enrollment. * Active participation in regular swimming training. * Current valid federation registration. * At least 6 months of previous experience with strength training or jumping exercises. * No musculoskeletal injury during the 2 months prior to enrollment. * Availability to attend at least 85% of the planned intervention sessions. * Written informed consent provided by a parent or legal guardian. * Assent provided by the athlete. Exclusion Criteria: * Musculoskeletal injury, pain, or medical condition contraindicating jump training, high-speed movement, or swimming start testing. * Participation in another uncontrolled lower-limb power training program during the study period. * Failure to comply with pre-test standardization procedures, including avoiding strenuous exercise during the 48 hours before testing. * Inability to complete baseline testing procedures.