This study aims to determine how flywheel-based inertial training (FIT) implemented according to principles of velocity-based training (VBT) and High-Intensity Interval Training (HIIT) affects disuse-induced physical de-conditioning including loss of voluntary muscle strength, aerobic capacity, and balance regulation.
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Voluntary activation
Timeframe: Baseline, day 13, and day 30
Twitch Properties-Electromechanical Delay
Timeframe: Baseline, day 13, and day 30
Twitch Properties-Rate of Torque Development
Timeframe: Baseline, day 13, and day 30
Twitch Properties-Time to peak Tension
Timeframe: Baseline, day 13, and day 30
Twitch Properties-Peak Twitch Torque
Timeframe: Baseline, day 13, and day 30
Twitch Properties-Relaxation Rate
Timeframe: Baseline, day 13, and day 30
Post activation Potentiation
Timeframe: Baseline, day 13, and day 30
Motor unit action potential train (MUAPT) firing rate
Timeframe: Baseline, day 13, and day 30
Motor unit action potential train (MUAPT) recruitment threshold.
Timeframe: Baseline, day 13, and day 30
Motor unit action potential train (MUAPT) de-recruitment threshold.
Timeframe: Baseline, day 13, and day 30
Muscle size
Timeframe: Baseline and day 30
Muscle Physiological cross-sectional area
Timeframe: Baseline and day 30
Muscle Fractional Anisotropy
Timeframe: Baseline and day 30
Muscle Diffusion properties
Timeframe: Baseline and day 30
Muscle cross-sectional area (Ultrasound)
Timeframe: Baseline, day 13, and day 30
Fascicle length
Timeframe: Baseline, day 13, and day 30
Pennation angle
Timeframe: Baseline, day 13, and day 30
Voluntary Isokinetic Muscle Strength
Timeframe: Baseline, day 13, and day 30
Voluntary Isometric Muscle Strength
Timeframe: Baseline, day 13, and day 30