Influence of Different Inertial Loads on Basic Training Variables During the Flywheel Squat Exercise

Area of Science:

• Sports Science
• Biomechanics
• Exercise Physiology

Background:

• Flywheel training is a potent method for enhancing strength and power.
• Understanding optimal inertial load selection is crucial for maximizing training adaptations.
• Familiarization with flywheel exercises is necessary for reliable performance data.

Purpose of the Study:

• To determine the effects of varying inertial loads on power production and maintenance during the flywheel quarter-squat.
• To establish the number of familiarization sessions required for stable performance measures.
• To analyze the eccentric:concentric ratio across different inertial loads.

Main Methods:

• Twenty-four elite handball players participated in four testing sessions.
• Four inertial loads (0.025–0.100 kg·m²) were used across sets of 10-15 repetitions.
• Concentric and eccentric peak power, along with the eccentric:concentric ratio, were recorded.

Main Results:

• Three familiarization sessions were required for outcome stabilization.
• The 0.025 kg·m² load yielded the highest concentric peak power.
• Higher loads (0.050–0.100 kg·m²) resulted in greater eccentric peak power and eccentric overload.
• No significant peak power decrements occurred within 5-12 repetitions per set.

Conclusions:

• At least three familiarization sessions are essential for reliable flywheel quarter-squat data.
• Lower inertial loads (0.025 kg·m²) are optimal for maximizing concentric power.
• Medium to high inertial loads are more effective for achieving greater eccentric overload.