Effect of caffeine on neuromuscular function following eccentric-based exercise.

Area of Science:

• Sports Science
• Exercise Physiology
• Nutritional Supplementation

Background:

• Eccentric exercise induces muscle damage and fatigue.
• Caffeine is a widely used ergogenic aid.
• Understanding caffeine's role in recovery is crucial for athletes.

Purpose of the Study:

• To investigate caffeine's effects on neuromuscular function, muscle power, and sprint performance post-eccentric exercise.
• To determine the optimal timing for caffeine's ergogenic effects during recovery.
• To assess caffeine's impact on both central and peripheral fatigue markers.

Main Methods:

• Double-blind, placebo-controlled crossover study with 11 male athletes.
• Eccentric-focused half-squat exercise protocol.
• Caffeine (5 mg/kg) or placebo administered 24, 48, and 72 hours post-exercise.
• Assessed neuromuscular function (MVC, twitch torque), muscle power (CMJ), and sprint performance.

Main Results:

• Maximal voluntary contraction and twitch torque decreased post-exercise but recovered within 24 hours, unaffected by caffeine.
• Sprint performance and voluntary activation remained unchanged throughout the study.
• Caffeine significantly increased vertical jump height and power at 48 and 72 hours post-exercise compared to placebo.

Conclusions:

• Caffeine supplementation improves muscle power during the later stages of recovery from eccentric exercise.
• Caffeine does not appear to influence neuromuscular function or sprint performance in the days following eccentric exercise.
• Athletes may benefit from caffeine for power-focused activities later in their recovery period.