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Characterising overload in inertial flywheel devices for use in exercise training
Kevin M Carroll1, John P Wagle1, Kimitake Sato1
1a Department of Sport, Exercise, Recreation, and Kinesiology , Center of Excellence for Sport Science and Coach Education, East Tennessee State University , Johnson City , TN , USA.
Sports Biomechanics
|March 22, 2018
Summary
Inertial flywheel squat training allows for kinetic overload and demonstrates that velocity can prescribe intensity. Muscle activation patterns differ between eccentric and concentric phases with increasing inertia.
Area of Science:
- Biomechanics
- Exercise Physiology
- Sports Science
Background:
- Inertial flywheel training is a novel method for resistance exercise.
- Understanding its kinetic and neuromuscular responses is crucial for optimizing training protocols.
Purpose of the Study:
- To assess kinetic characteristics and overload potential in inertial flywheel squat training.
- To examine eccentric and concentric muscle activations during this exercise.
- To explore velocity measurement as a method for intensity prescription.
Main Methods:
- Two experiments were conducted, evaluating kinetic and muscle activation responses to progressive inertial loads.
- The second experiment focused on establishing load-velocity relationships using six inertial loads.
Main Results:
- Significant differences in peak force, net impulse, and impulse ratios were observed across inertial loads (p < 0.05).
- Concentric vastus lateralis activation significantly increased with higher inertia (p < 0.05), while eccentric quadricep activation decreased.
- Statistically significant regression models were found for average (R² = 0.66) and peak concentric velocity (R² = 0.60).
Conclusions:
- Kinetic overload is achievable with inertial flywheel squats.
- Muscle activation is phase-specific and responds variably to increased inertia.
- Concentric velocity shows potential as a reliable metric for prescribing training intensity in this modality.
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