Humans Performance Cours d'action Breast cancer Muscle Pain Elastography Aging Quadriceps Power output Kinematics Analyse du Mouvement en Biomécanique Physiologie et Imagerie Activation Ultrasound Electromechanical delay Low back pain Isokinetic Running Anxiety Supersonic shear imaging Stretching Training Motor units Ultrasonography Apprentissage situé Appropriation Cycling Physical education Muscle contraction EMG Fatigability Enaction Gastrocnemius Depression Action située Biomechanics Interactions Microcirculation Female Hypertonic saline Plantar flexors Skin Power Activité collective Knee extensors Gait analysis Reliability Elderly Mechanical properties Balance Children Exercise Lengthening contraction Adult Muscle activation Elasticity TDCS Muscle coordination Pregnancy Expertise Tendon Lower limbs Communal coping Quality of life Electromyography MRI Shear wave elastography Interpersonal coordination Gait Maximal power Postural control Sport Force-velocity relationship Force Ultrafast ultrasound Physical activity Surface electromyography Anthropometry COVID-19 Ageing Fatigue Male Viscosity Aged Cours d’action Muscle fatigue Shear modulus Overweight Passive torque Postural balance Force platform Obstetric anal sphincter injury Neuromuscular fatigue Torque Muscle synergies Pedaling Stiffness Cognition Rowing Course of action