Effect of short-term creatine supplementation on neuromuscular function

Area of Science:

• Sports Science
• Exercise Physiology
• Nutritional Biochemistry

Background:

• Creatine supplementation is widely used to enhance athletic performance.
• Understanding creatine's impact on neuromuscular function is crucial for optimizing training.
• Previous research has explored creatine's effects on strength and power.

Purpose of the Study:

• To investigate the effects of short-term creatine supplementation on muscle contractile properties.
• To assess changes in the force-velocity relationship following creatine intake.
• To determine the impact on mean muscle fiber conduction velocity (CV).

Main Methods:

• A double-blind, randomized design involving 16 moderately trained men.
• 5-day supplementation with creatine (5g 4x/day) or placebo.
• Assessment of isometric maximal voluntary contraction, maximal twitch, force-velocity, and EMG during fatiguing contractions in elbow flexors.

Main Results:

• Creatine group showed a 33.4% increase in peak twitch torque and 54.7% faster time to peak torque.
• Enhanced torque-angular velocity curve, particularly at higher velocities, post-creatine supplementation.
• Mean muscle fiber conduction velocity (CV) increased by 8.9% in the creatine group.

Conclusions:

• Oral creatine supplementation demonstrably improves neuromuscular function.
• Benefits observed in both voluntary and electrically induced muscle contractions.
• Short-term creatine intake enhances muscle contractile properties and neural activation.