Comparison of the Isokinetic Strength of Knee Muscles Between Normally Sighted and Visually Impaired Girls

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Eskandari A.; Zarei M.; Barati A.H.; Mohammadi F.

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Journal Paper

Paper Information

Journal: Iranian Journal of War and Public Health Year:2024 | Volume:16 | Issue:2 Page(s): 111-116

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Title

Comparison of the Isokinetic Strength of Knee Muscles Between Normally Sighted and Visually Impaired Girls

Author(s)

Eskandari A. | Zarei M. | Barati A.H. | Mohammadi F. | Issue Writer Certificate

Keywords

Muscle strengthQ4

Visual impairmentQ4

Hamstring MusclesQ4

Quadriceps MuscleQ4

Abstract

Aims: The proportion of strength in knee flexor and extensor muscles is an important factor in balance and fall prevention. This study aimed to compare the isokinetic strength of knee muscles in healthy sighted girls and those with Visual impairment. Instrument & Methods: This descriptive study was carried out on sighted and visually impaired female students in June 2023 in Tehran, Iran. The samples were selected by convenience sampling (n=52; 22 visually impaired and blind, 30 sighted). Maximum torque (normalized to body weight), average power, and the ratio of agonist to antagonist muscles in knee flexion and extension at three angular velocities (60, 120, 180 degrees per second) were evaluated and compared between the two groups using an isokinetic dynamometer. Data was analysed by an independent t-test. Findings: The maximum isokinetic torque of knee extensor muscles in sighted individuals at angular velocities of 60, 120, and 180 degrees per second in both the dominant and non-dominant legs was significantly better than their visually impaired counterparts. However, visually impaired individuals had significantly greater maximum torque in knee flexion at a speed of 60 degrees per second in both legs (p<0.05). No significant differences were observed at other speeds. Additionally, a significant difference was found in the mean power in the dominant and non-dominant legs at three angular velocities (60, 120, and 180 degrees per second) in favor of sighted individuals. Conclusion: Visually impaired individuals had significantly higher values for maximum torque and power compared to individuals with Visual impairments. Therefore, intervention programs to address this deficiency should commence early in the growth period of visually impaired individuals.

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