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OBJECTIVES: To compare two methods for classifying an individual as sarcopenic for predicting decline in physical function in the Health, Aging and Body Composition Study.

DESIGN: Observational cohort study with 5 years of follow‐up.

SETTING: Communities in Memphis, Tennessee, and Pittsburgh, Pennsylvania.

PARTICIPANTS: Men and women aged 70 to 79 (N=2,976, 52% women, 41% black).

MEASUREMENTS: Appendicular lean mass (aLM) was measured using dual energy x‐ray absorptiometry, and participants were classified as sarcopenic first using aLM divided by height squared and then using aLM adjusted for height and body fat mass (residuals). Incidence of persistent lower extremity limitation (PLL) was measured according to self‐report, and change in objective lower extremity performance (LEP) measures were observed using the Short Physical Performance Battery.

RESULTS: There …