Short-term Resistance and Plyometric Training Improves Eccentric Phase Kinetics in Jumping

Area of Science:

• Sports Science
• Exercise Physiology
• Biomechanics

Background:

• Resistance and plyometric training are common methods to enhance athletic performance.
• Understanding the impact of training on force- and power-time curves is crucial for optimizing jump performance.
• Short-term training effects on specific phases of the jump (eccentric vs. concentric) require further investigation.

Purpose of the Study:

• To investigate the effects of an abbreviated resistance and plyometric training program on force- and power-time curve variables during jumping.
• To analyze changes in eccentric and concentric performance metrics following a 4-week training intervention.

Main Methods:

• Nineteen male subjects were divided into training (n=9) and control (n=10) groups.
• The training group performed squats (90% 1RM) and drop jumps twice weekly for 4 weeks.
• Force- and power-time curves during countermovement jumps (CMJ) and static jumps (SJ) were analyzed pre- and post-training.

Main Results:

• The training group showed significant increases in absolute and relative squat strength.
• In the CMJ, the training group exhibited decreased eccentric time, minimum force, and eccentric impulse, with increased eccentric rate of force development.
• Significant improvements in eccentric rate of power development and reductions in minimum power and eccentric work were observed in the CMJ.

Conclusions:

• Short-term strength and plyometric training can significantly alter eccentric performance variables during jumping.
• The training program preferentially enhanced eccentric phase characteristics rather than concentric phase improvements.
• This suggests that abbreviated training protocols may be effective for targeting specific aspects of jump mechanics.