Scheduling Repeated-Sprint Training on Different Microcycle Days in Professional Soccer Players: A Randomized...

Area of Science:

• Sports Science
• Exercise Physiology
• Soccer Performance

Background:

• Repeated-sprint training (RST) is a common method for enhancing anaerobic performance in soccer.
• Optimal scheduling of RST within the microcycle is crucial for player recovery and performance.
• Understanding the acute responses to RST based on its timing relative to match day is essential for coaches.

Purpose of the Study:

• To compare the acute neuromuscular, mechanical, and perceptual responses to RST performed on MD-4 versus MD-3 in professional soccer players.
• To determine the impact of RST timing on training load, jump performance, muscle soreness, and recovery status.
• To provide evidence-based recommendations for scheduling RST in professional soccer microcycles.

Main Methods:

• A randomized crossover design involving 17 male professional outfield soccer players.
• Players completed two microcycles, performing a high-volume RST protocol (3x10x30m) on either MD-4 or MD-3, with a 1-week washout period.
• Measurements included external (GPS) and internal (RPE) training loads, countermovement jump height, muscle mechanical properties (MyotonPRO), and perceptual markers (TQR, Hooper Index).

Main Results:

• No significant differences in training load were observed between MD-4 and MD-3 RST conditions.
• Countermovement jump performance decreased significantly post-RST in both conditions.
• Delayed onset muscle soreness (DOMS) and fatigue increased post-RST, with significantly higher DOMS reported after MD-3 RST.
• Total quality recovery scores decreased significantly post-RST, with no changes in muscle tone, stiffness, or elasticity.

Conclusions:

• While RST elicits similar training loads regardless of microcycle timing, performing it closer to match day (MD-3) may lead to increased residual muscle soreness.
• Coaches should consider scheduling high-intensity RST earlier in the microcycle (e.g., MD-4) to allow for adequate recovery and optimize match-day readiness.
• Further research could explore different RST volumes and intensities in relation to microcycle timing.