The present invention relates to myostatin or activin antagonists, dose regimen and pharmaceutical compositions thereof, for the treatment of sarcopenia, in particular age-related sarcopenia. Especially, the myostatin or activin antagonist bimagrumab was found to be beneficial in the treatment of older adults with sarcopenia with respect to increasing their skeletal muscle strength and function.本發明係關於肌肉生長抑制素或活化素拮抗劑、其給藥方案及醫藥組合物,其用於治療肌力退化症,尤其年齡相關之肌力退化症。尤其,已發現該肌肉生長抑制素或活化素拮抗劑比麥盧單抗(bimagrumab)在為患有肌力退化症之老年人增加骨胳肌強度及功能方面具有治療效益。