Abstract: Abstract Objective : To study lower limb strength changes of fallers in further to analyze fall related factors and prevent fall. Method : Isokinetic muscle testing was performed in 14 subjects with a history of one or more falls in the prior year (i.e. fallers) as well as a control group of 58 non-fallers. Peak torque (PT) and power (POW) were recorded at two velocities (60 degree/s and 120 degree/s) on a Biodex Isokinetic Dynamometer for four muscle groups which include knee extensors, knee flexors, ankle plantar flexors and ankle dorsiflexors. All parameters of fall group were compared with control group. Results: No significant difference was observed in PT and POW of knee extensors and flexors in two groups (p>0.05). PT and POW of ankle dorsiflexors in fall group was significant smaller than non- fall group at 120 degree/s (p<0.05). PT of ankle plantar flexors in fall group was significant weakness than non- fall group at 60 degree/s (p<0.05). Conclusion : Isokinetic muscle testing can be applied to older people fall risk protocol. It can provide referencing data for fall risk evaluation as well as the major training item.

Key words: Fall, Old people, lower limb strength, Isokinetic