Squat jump training at maximal power loads vs. heavy loads: effect on sprint ability

Area of Science:

• Sports Science
• Exercise Physiology
• Biomechanics

Background:

• Optimizing training loads for athletic performance is crucial.
• Training at maximal power output (Pmax) is intuitively appealing but under-researched for performance enhancement.
• Understanding the relationship between strength, power, and sprint performance is key for athletes.

Purpose of the Study:

• To investigate the effectiveness of training at Pmax loads versus heavy loads for improving sprint performance in well-trained rugby league players.
• To determine the relationship between changes in strength, maximal power, and sprint times following different training protocols.

Main Methods:

• 18 rugby league players were randomized into two equal-volume training groups for 7 weeks.
• One group trained with heavy loads (80% one-repetition maximum [1RM]), while the other trained at individually determined Pmax loads (20.0-43.5% 1RM).
• Performance measures included 1RM strength, maximal power, and 10m and 30m sprint times.

Main Results:

• Both training groups showed improvements in sprint times, with no clear difference between the 80% 1RM and Pmax groups.
• The 80% 1RM group demonstrated a possibly substantially greater improvement in 1RM strength compared to the Pmax group.
• Small-to-moderate negative correlations were observed between changes in 1RM strength and sprint times in the combined groups.

Conclusions:

• Training at loads that maximize individual peak power output was not more effective for improving sprint ability than training with heavy loads in professional team sport athletes.
• The observed changes in power output were not usefully related to changes in sprint ability, questioning the direct transferability of Pmax training benefits to sprint performance.