Effects of 6-Week Weighted-Jump-Squat Training With and Without Eccentric Load Reduction on Explosive Performance

Area of Science:

• Sports Science
• Exercise Physiology
• Biomechanics

Background:

• Barbell weighted-jump-squat (WJS) training is a common method for enhancing explosive athletic performance.
• The role of eccentric loading in WJS training and its impact on performance adaptations require further investigation.

Purpose of the Study:

• To compare the effects of 6-week barbell weighted-jump-squat (WJS) training with and without eccentric load reduction on explosive performance.

Main Methods:

• Twenty well-trained male athletes were divided into two groups: control (traditional WJS) and experimental (50% eccentric load reduction).
• Both groups underwent 12 WJS training sessions over 6 weeks, performing 6 sets of 5 repetitions at 30% of 1-repetition maximum (1RM).
• Performance metrics including countermovement jump, 20-m sprint, standing long jump, and 1RM back squat were assessed pre- and post-intervention.

Main Results:

• Both training groups showed significant improvements in countermovement jump height, peak power output, 20-m sprint times, standing long jump distance, and 1RM back squat.
• No significant differences were observed between the traditional WJS group and the eccentric load reduction group for any performance variable.

Conclusions:

• Both WJS training protocols, with and without eccentric load reduction, are effective in enhancing explosive performance.
• Reducing eccentric load during WJS training may offer a more tolerable alternative for athletes undergoing intense training or rehabilitation, yielding comparable performance benefits.