Cardiorespiratory Responses to Flywheel-Based Inertial Training Squats With Varying Moments of Inertia

Clara J. Mitchinson; Stuart A. Best; John F. Caruso; Lance M. Bollinger

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Cardiorespiratory Responses to Flywheel-Based Inertial Training Squats With Varying Moments of Inertia

Clara J. Mitchinson ^[1] ; Stuart A. Best ; John F. Caruso ; Lance M. Bollinger
1. [1] University of Kentucky
  
  University of Kentucky
  
  Estados Unidos
Localización: Journal of strength and conditioning research: the research journal of the NSCA, ISSN 1064-8011, Vol. 39, Nº. 3, 2025, págs. 300-306
Idioma: inglés
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Resumen
- Flywheel-based inertial training (FIT) has gained popularity as a means to enhance muscle hypertrophy. Other applications, such as aerobic exercise training, remain unexplored. The aim of this study was to determine the cardiorespiratory responses to acute FIT with varying moments of inertia (MOIs). Overall, 20 (10 M, 10 F) healthy, physically active subjects underwent maximal graded exercise testing and completed 3 bouts of FIT exercise (1 familiarization session and 2 identical data collection sessions). Subjects completed quarter squats (60[degrees] peak knee flexion) at a pace of 50 squats[middle dot]minute-1 until volitional fatigue. Flywheel-based inertial training MOI was increased by 0.005 kg[middle dot]m2 every 3 minutes until a final workload of 0.020 kg[middle dot]m2. Heart rate and gas exchange data were collected continuously and averaged over the final 60 s of each stage. Data were analyzed by a linear mixed model. During the final testing session, there was a main effect of MOI to increase heart rate (HR), V[Combining Dot Above]O2, and RER. Men displayed greater oxygen consumption, but a similar %V[Combining Dot Above]O2peak compared with women. We noted a significant inertia x sex interaction where RER tended to be lesser in women at higher MOI. In the final stage of exercise (MOI: 0.020 kg[middle dot]m2), HR and V[Combining Dot Above]O2 were approximately 75-80 and 55% of peak, respectively, and RER was approximately 0.95-1.00. FIT quarter squats elicit moderate HR and V[Combining Dot Above]O2 responses, but near-maximal RER suggests a novel metabolic training stimulus. This exercise may supersede the lactate threshold and may not be sustainable for prolonged times. The physiological and performance effects of training in this manner are unclear.