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OBJECTIVES: To examine the definition of sarcopenia in Chinese subjects by relating the value of appendicular skeletal muscle mass (ASM) divided by height squared to physical functional outcomes after 4 years.

DESIGN: Four‐year prospective study.

SETTING: A Chinese community in Hong Kong SAR China.

PARTICIPANTS: Three thousand one hundred fifty‐three community‐living men and women aged 65 and older.

METHODS: Information collected by questionnaire included demographics, health limitation on activities of daily living (ADLs), self‐care, physical activity level, dietary intake, and psychosocial functioning. Measurements included height, weight, grip strength, step length in a 6‐minute walk, and body composition. Four‐year outcomes for those with ASM in kg per height in meters squared (ASM/ht²) less than 2 standard deviations (SDs) and 2 SDs or more below the young adult mean value …