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Impact kinetics associated with four common bilateral plyometric exercises.
Ethan Stewart1, Thomas Kernozek2, Hsien-Te Peng3
1Department of Kinesiology, Mississippi State University, Mississippi State, MS, USA - ems664@msstate.edu.
The Journal of Sports Medicine and Physical Fitness
|April 25, 2018
Summary
This study analyzed forces during plyometric exercises, finding significant differences in impact kinetics between depth jumps and consecutive jumps. Proper program planning is crucial for managing these forces.
Area of Science:
- Biomechanics
- Exercise Physiology
- Sports Science
Background:
- Quantified peak vertical ground reaction force (VGRF), impulse, and loading rates during bilateral plyometric exercises.
- Investigated the impact kinetics of various plyometric movements.
Purpose of the Study:
- To compare the VGRF, impulse, and loading rates across different bilateral plyometric exercises.
- To understand the biomechanical demands of depth jumps and consecutive jumps.
Main Methods:
- Fourteen collegiate male athletes performed depth jumps from 30, 60, 90 cm and a 2 consecutive jump exercise.
- Force platforms measured vertical ground reaction forces during the stance phase.
- Dependent variables were normalized to body weight and analyzed using ANOVA.
Main Results:
- Significant differences in VGRF, impulse, and loading rates were observed between exercises (P≤0.05).
- Depth jumps from 90 cm (DJ90) yielded the highest peak VGRF (approx. 5x body weight).
- The 2 consecutive jump (2CJ) exercise showed similar impulse and loading rates to DJ90.
Conclusions:
- Plyometric exercises exhibit distinct impact kinetics, influencing ground contact forces.
- Implementing plyometric training requires careful progression and program planning to manage biomechanical stress.
