Muscle strength: A better index of low physical performance than muscle mass in older adults

Aim The most appropriate muscle index for the definition of sarcopenia has not been agreed on. We aimed to investigate the associations of muscle mass and strength with 5‐year mortality and low physical performance. Methods We included 560 participants aged 65 years or older in the analysis. Muscle and fat mass were assessed by dual‐energy X‐ray absorptiometry. Leg muscle and grip strength were measured using dynamometers. The clinical outcomes were 5‐year mortality and low physical performance (Short Physical Performance Battery score