背　景雖然低衝擊舞蹈是晨間運動常見項目之一，然而並不瞭解長期從事這項運動，對中老年婦女的下肢關節活動度與膝關節力矩的影響。目　的比較中老年婦女其長期從事低衝擊舞蹈者與無規律身體活動者的下肢關節活動度與膝關節力矩的差異。方　法26位長期從事低衝擊舞蹈的婦女與12位無規律身體活動習慣（控制組）的婦女，進行身體組成、膝關節力矩、踝關節與膝關節之關節活動度及跟骨超音波骨質密度測量。結　果在低衝擊舞蹈組慣用腳的踝關節內翻、屈蹠、屈足背的活動度皆顯著高於控制組（p <.05）；再者，低衝擊舞蹈組非慣用腳的踝關節內翻也顯著高於控制組（p < .05）。低衝擊舞蹈組非慣用腳的膝關節伸直力矩顯著高於控制組（p< .05）。結　論雖然本研究不是介入型的研究，但藉由與無規律身體活動習慣者相比較，低衝擊舞蹈有助於維持較高的下肢關節活動度與膝關節力矩。這些正面特點，在未來將有助於低衝擊舞蹈介入對降低跌倒風險因子的相關研究。

Background: Although low-impact dance is one of the most prevalent exercises in older persons, little is known about its effects on knee torque and range of motion (ROM) in lower extremity joints.Purpose: The aim of this study was to examine the effects oflow-impact dance on knee torque and lower extremity joint ROM in older women.Methods: Twenty-six low-impact dancers and 12 physically inactive individuals comprised the dance group (DG) and the control group (CG), respectively. The knee extension torque, knee and ankle ROMs, and bone mineral density in calcanei were measured for all participants.Results: Several ROMs of the lower extremity joints in the dominant leg, ankle inversion,
plantarflexion, and dorsiflexion were significantly higher in the DG than in the CG (p G .05). In addition, the ankle inversion of the nondominant leg in the DG was also significantly higher than that in the CG. The knee extension torque of the nondominant leg in the DG was significantly
higher than that in the CG (p G .05).Conclusion: Although this study did not focus on the efficacy of a particular intervention type, the results showed that lowimpact dance can help achieve higher lower extremity ROM
and knee torque values than attained by inactive individuals. It is
hoped that this exposition of positive benefits will encourage further studies related to the effect of low-impact dance intervention
on reducing fall risk.