Differential motor unit changes after endurance or high-intensity interval training

High-Density Surface Emg; Motor Unit Adaptation; Motor Unit Decomposition; Motor Unit Discharge Rate; Motor Unit Tracking; Neuromuscular Adaptation; Adaptation, Physiological; Adult; Cardiorespiratory Fitness; Electromyography; Humans; Knee; Male; Motor Neurons; Oxygen Consumption; Physical Endurance; Quadriceps Muscle; Torque; High-Intensity Interval Training; Orthopedics and Sports Medicine; Physical Therapy, Sports Therapy and Rehabilitation