这个词是什么意思？
A state of increased vulnerability to stressors, following declines in function and reserves across multiple physiologic systems, characterized by MUSCLE WEAKNESS; FATIGUE; slowed motor performance; low physical activity; and unintentional weight loss.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D000073496 · MeSH 2026。
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