目的，探討腦性麻痺兒童坐站功能性肌力與其粗動作功能及下半身個別肌肉群肌力之關係。方法：20名6-12歲痙攣型雙邊麻痺兒童，在2-7天內接受粗動作功能量表(Gross Motor Function Measure 2(上標 nd), GMFM)，坐站一次最大荷重，下肢個別肌肉之最大等長肌力（以尼可拉斯肌力測試儀測量髖、膝及踝關節之伸直及屈曲肌、髖關節外展及內收肌、踝關節背屈肌與蹠屈肌），及腰部脊旁肌肌耐力（以碼表測試維持時間）等測量。坐站一次最大荷重與個別肌力都除以體重得標準化肌力。以皮爾森積差相關係數與逐步回歸分析檢定變項間之相關。結果：標準化坐站一次最大荷重與GMFM之總分及訓練領域目標分數呈高相關(r=0.76~0.80, p<0.01)，各肌肉肌力與坐站一次最大荷重有顯著相關，標準化膝伸直肌肌力及髖外展肌肌力為標準化坐站一次最大荷重之最佳預測因子(R=0.72, P<0.01)。結論，痙攣型雙邊麻痺兒童之坐站功能性肌力與其粗動作功能及膝伸直肌、髖外展肌肌力有高相關，因此坐站荷重測試可為測試腦性麻痺兒童之功能性肌力方法之一，建議進一步研究增進腦性麻痺兒童粗動作功能之最佳阻力訓練量之訓練方法阻力。

Purposes: To investigate the relations of the sit-to-stand functional muscle strength with gross motor abilities and the individual muscle strength in children with cerebral palsy. Methods: 20 children with spastic diplegia and age range of 72 to 122 months were recruited. The scores of Gross Motor Function Measure (GMFM), normalized one repetition maximum of the loaded sit-to-stand test (NSTS1RM), and normalized maximum isometric strength in lower extremities with Nicholas hand-held dynamometer were obtained for each child within 2-7 days. Results: There was significant correlation between NSTS1RM and the GMFM total scores and goal dimension scores (r=0.76~0.80, p<0.0l), and between NSTSIRM and muscle strength of 8 muscles of lower extremities and trunk extensor strength. The stepwise regression found that the muscle strength of knee extensor and hip abductor were the best predicting factors for NSTS1RM (R^2=0.72, p<0.0l). Conclusion: The NSTS1RM was highly correlated with the gross motor function and the muscle strength of hip abductors and knee extensors in children with spastic diplegia. The loaded sit-to- stand test can be used for quantitative muscle strength testing and for investigating the optimal strengthening load in children with cerebral palsy.