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Determining variables of plyometric training for improving vertical jump height performance: a meta-analysis
Eduardo Saéz-Saez de Villarreal1, Eleftherios Kellis, William J Kraemer
1University Pablo de Olavide, Seville, Spain. edysaez@hotmail.com
Journal of Strength and Conditioning Research
|February 7, 2009
Summary
Plyometric training significantly enhances vertical jump height (VJH). Optimal gains are achieved with longer training durations, higher intensity, varied jump types, and for more experienced athletes.
Area of Science:
- Sports Science
- Exercise Physiology
- Biomechanics
Background:
- Plyometric training is a cornerstone for improving explosive power, particularly vertical jump height (VJH).
- The efficacy of plyometric interventions is influenced by numerous training and individual variables.
- A comprehensive understanding of these factors is crucial for optimizing performance enhancements.
Purpose of the Study:
- To conduct a meta-analysis examining factors influencing plyometric training effectiveness on VJH.
- To identify optimal training parameters and participant characteristics for maximizing VJH gains.
- To provide evidence-based recommendations for strength and conditioning professionals.
Main Methods:
- Meta-analysis of 56 studies encompassing 225 effect sizes related to plyometrics and VJH.
- Inclusion criteria: lower-limb plyometrics, true experimental designs, valid measurements, sufficient data for effect size calculation.
- Statistical analysis to determine the influence of training volume, intensity, type, and participant factors.
Main Results:
- Greater VJH improvements observed in athletes with higher sports experience.
- Training duration exceeding 10 weeks and 20 sessions, with >50 jumps/session, maximized gains.
- Combining varied plyometric exercises (e.g., squat, countermovement, drop jumps) yielded superior results compared to single types.
- No additional benefit from incorporating added weight during plyometrics.
- Men tended to show greater power improvements than women.
Conclusions:
- Plyometric training effectiveness for VJH is highly dependent on training dose, type, and individual athlete characteristics.
- Experienced athletes and specific training protocols (volume, intensity, variety) are key to optimizing VJH.
- Strength and conditioning professionals should consider these dose-response relationships for tailored plyometric programming.
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