How do I know if I have sarcopenia?

Muscle weakness which can interfere with physical activity is a symptom of sarcopenia. However, clinical measures of the muscle mass and function are needed to detect sarcopenia, under the care of a clinical practitioner. Muscle mass can be measured by body composition assessment techniques such as DXA (Dual X-ray absorptiometry), MRI (Magnetic Resonance Imaging) and CT (Computed Tomography); or bioelectrical impedance. Physical performance measures include knee extensions, walking speed, hand grip tests and time taken to stand from a seated position.