Volume 16, Issue 2 (2024)                   Iran J War Public Health 2024, 16(2): 1001-1008 | Back to browse issues page


Ethics code: IR.SBU.Rec1402.043


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1- , zareeimostafa@yahoo.com
Abstract   (327 Views)
Objective: strength of the knee flexor and extensor muscles is an important factor for balance and preventing falls. But limited studies have compared this strength in sighted and visually impaired girls. Therefore, the aim of this study was to compare the isokinetic strength of the knee muscles of sighed and visually impaired girls.
  Methodology: 22 female students with visual impairment and 33 sighted subjects matched based on age and body mass index participated in this study. Variables of maximum torque (normalized based on weight), average power and the ratio of agonist to antagonist muscles in knee flexion and extension at  three angular velocity 60, 120, 180 degrees per second as the isokinetic using the isokinetic device (Biodex System 4 ) in the two groups evaluated And the comparison was made. Independent t-test was used to evaluate of differences the inter-group.
Result: The results of the study showed that the maximum isokinetic torque of the knee extensor muscles of sighted people at angular velocities of 60, 120 and 180 in the dominant and non-dominant leg was significantly better than the visually impaired counterparts. However, the knee flexor muscles of individuals with visual impairment had significantly more maximum torque in the flexion movement at a velocity of 60 degrees per second (p < 0.05). No significant difference was observed in other velocities. Also, a significant difference was observed in the average power in the dominant and non-dominant leg of the 60, 120, and 180 degrees per second angular velocity