Effects of Microdosed Plyometric Training on Lower-Limb Neuromuscular Function and Sport-Specific Performance in Rope-Skipping Athletes

Condition(s) studied

Investigational drug(s) / intervention(s)

Microdosed Plyometric Training: Participants assigned to this intervention will continue their regular rope-skipping-specific training and complete an 8-week microdosed plyometric training program. Plyometric training will be distributed across five sessions per week using a high-frequency, short-duration format. The exercise content, total weekly training duration, total weekly jump contacts, and progression principles will be matched as closely as possible to the traditional concentrated plyometric training intervention. The primary difference between the interventions will be training frequency and the amount of training completed in each session.

Traditional Concentrated Plyometric Training: Participants assigned to this intervention will continue their regular rope-skipping-specific training and complete an 8-week traditional concentrated plyometric training program. Plyometric training will be performed in two concentrated sessions per week. The exercise content, total weekly training duration, total weekly jump contacts, and progression principles will be matched as closely as possible to the microdosed plyometric training intervention. The primary difference between the interventions will be training frequency and the amount of training completed in each session.

Study summary

The goal of this clinical trial is to compare two ways of scheduling plyometric training in rope-skipping athletes. The study will examine whether short and frequent training sessions have different effects on lower-limb muscle function, rope-skipping performance, and perceived fatigue compared with longer training sessions performed less often.

Approximately 60 rope-skipping athletes will be randomly assigned to one of two groups. Both groups will continue their regular rope-skipping training and complete an additional 8-week plyometric training program. One group will perform short plyometric training sessions five days per week. The other group will perform concentrated plyometric training sessions twice per week. The exercise content, weekly training volume, and training progression will be kept as similar as possible between the two groups.

Researchers will assess lower-limb muscle function and rope-skipping-specific performance before and after the intervention. Training attendance, completion, perceived exertion, muscle soreness, and adverse events will also be recorded. The study aims to determine whether distributing plyometric training across more frequent and shorter sessions produces different training effects from concentrating the training into fewer sessions.

Eligibility

Primary outcome measure(s)

• Change From Baseline in Isokinetic Knee Extensor Total Work at Week 8 — Baseline and post-intervention at Week 8
  Lower-limb muscular endurance will be assessed using an isokinetic dynamometer. Following a standardized warm-up and familiarization procedure, participants will perform 30 consecutive maximal concentric knee-extension contractions with the dominant lower limb at an angular velocity of 180 degrees per second. The total work performed by the knee extensors across all valid repetitions will be recorded and reported in joules (J). Change from baseline will be calculated as the Week 8 value minus the baseline value. Higher values indicate greater lower-limb muscular endurance.
• Change From Baseline in Isokinetic Knee Extensor Peak Torque at Week 8 — Baseline and post-intervention at Week 8
  Lower-limb muscle strength will be assessed using an isokinetic dynamometer. Following a standardized warm-up and familiarization procedure, participants will perform maximal concentric knee-extension contractions with the dominant lower limb at an angular velocity of 60 degrees per second. The highest peak torque obtained from the valid repetitions will be recorded and reported in newton-metres (N·m). Change from baseline will be calculated as the Week 8 value minus the baseline value. Higher values indicate greater lower-limb muscle strength.
• Change From Baseline in Standing Broad Jump Distance at Week 8 — Baseline and immediately after the 8-week intervention
  Lower-limb explosive performance will be assessed using the standing broad jump test. Following a standardized warm-up, participants will stand behind the take-off line with both feet parallel and jump forward as far as possible using a simultaneous two-foot take-off and landing. Each participant will complete three valid trials, with an adequate recovery interval between trials. The longest valid horizontal distance from the take-off line to the nearest point of contact on landing will be recorded in metres (m). Change from baseline will be calculated as the Week 8 value minus the baseline value. Higher values indicate better lower-limb explosive performance.

Trial sites (1)

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