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Muscle wasting diseases has two distinct trajectories on the 3‐dimensional age‐BMI‐peak VO2 scatterplot

Frailty and sarcopenia are age‐related morbid states, and a low body mass index (BMI) is a characteristic of frailty and cachexia. However, no common index for assessing these three muscle wasting states is available, making it difficult to understand the relationship among them. Peak oxygen uptake (peak VO2), an index of life expectancy, may be a useful common index. Therefore, this study aimed to investigate the relationship among sarcopenia, frailty, and cachexia using age, BMI, and peak VO2.