查證了一下 Spinal muscular atrophy (SMA) 脊髓性肌萎縮症(SMA) muscle contraction were consistently down-regulated in SMA I SMA I(第一型)中肌肉收縮(肌肉張力)持續下調 節錄自https://www.ncbi.nlm.nih.gov/pubmed/19351384 Spinal muscular atrophy (SMA) 脊髓性肌萎縮症(SMA) How SMA affects a child depends on when the disorder first causes symptoms. Early signs of SMA include: muscle weakness and poor muscle tone (a lack of tension in the muscles, which can cause floppiness) SMA如何影響孩子取決於疾病何時首次引起症狀。 SMA的早期跡象包括: 肌肉無力和肌肉張力差(肌肉缺乏張力,可能會導致鬆弛) 節錄自https://www.rch.org.au/kidsinfo/fact_sheets/Spinal_muscular_atrophy/