Chronic eccentric cycling improves quadriceps muscle structure and maximum cycling power

Area of Science:

• Exercise Physiology
• Muscle Physiology
• Sports Science

Background:

• Eccentric exercise can induce muscle hypertrophy without immediate strength gains.
• This phenomenon may be linked to prolonged suppressive effects on muscle force production.
• Delayed detection of strength improvements might necessitate a recovery phase post-training.

Purpose of the Study:

• To investigate changes in muscular structure and maximal concentric cycling power (Pmax) after eccentric cycling training.
• To determine the time course of these adaptations, particularly the impact of a recovery period.

Main Methods:

• Eight weeks of eccentric cycling training (2x/week) were performed by healthy individuals.
• Muscle structure (rectus femoris and vastus lateralis thickness and pennation angles) was assessed.
• Maximal concentric cycling power (Pmax) was measured 1 week and 8 weeks post-training.

Main Results:

• Significant increases in rectus femoris and vastus lateralis thickness and pennation angles were observed 1 week post-training.
• Pmax increased by 5% at 1 week and 9% at 8 weeks post-training, indicating a greater improvement after recovery.
• These findings suggest eccentric cycling is effective for improving lower body muscle structure and function.

Conclusions:

• Short-duration, high-intensity eccentric cycling effectively enhances lower body muscular structure and function.
• A post-training recovery period is crucial for fully realizing the gains in muscular power.
• Eccentric cycling presents a time-efficient intervention for improving muscle adaptations.