Based on the diagnostic criteria for age-related sarcopenia developed by the European Working Group on Sarcopenia in Older People (EWGSOP), Sarcopenia is clinically defined as:

(1) Gait speed

• <1.0m/s

(2) Handgrip strength

• Men: <28kg, Women: <18kg

(3) Appendicular skeletal muscle mass (ASM)

• Dual-energy X-ray absorptiometry (Men: <7.0kg/m2, Women: <5.4kg/m2)

Assessment tools for sarcopenia:
Sarcopenia should be diagnosed in three criteria:

(1) Muscle mass

• Computed Tomography scan (CT scan).
• Magnetic Resonance Imagery (MRI).
• Dual Energy X-ray Absorptiometry (DXA).
• Bioimpedance analysis (BIA).

(2) Muscle strength

• Handgrip strength.

(3) Physical performance

• Short Physical Performance Battery (SPPB).
• Gait speed.
• Grip strength.
• Thigh muscle thickness ratio.