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Measurement reliability of the L4/5 lumbar multifidus (MF) muscles is high in older adults, but few studies have investigated measurement reliability of the abdominal and upper lumbar MF muscles in this age group.To determine measurement reliability of abdominal and lumbar MF muscles from a single ultrasound (US) image in older adults.Resting thickness of rectus abdominis and obliquus externus, resting...