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KMID : 1140920180420010113
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Annals of Rehabilitation Medicine
2018 Volume.42 No. 1 p.113 ~ p.119
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Association Between Asymmetry in Knee Extension Strength and Balance ina Community-Dwelling Elderly Population: A Cross-Sectional Analysis
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Chon Jin-Mann
Kim Hee-Sang
Lee Jong-Ha
Yoo Seung-Don
Yun Dong-Hwan
Kim Dong-Hwan
Lee Seung-Ah
Han Yoo-Jin
Soh Yun-Soo
Kim Yong
Han Young-Rok
Won Chang-Won
Han Seon-Young
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Abstract
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Objective: To evaluate the association between balance function and asymmetry of knee extension strength in an elderly Korean population.
Methods: The strength of the knee extensors in each leg was measured in 306 community-dwelling elderly subjects (age, 76.70±4.85 years) and 25 young healthy subjects (age, 34.23±8.93 years). Based on the difference in strength of both legs, the elderly subjects were divided into symmetric (n=128) and asymmetric (n=178) strength groups using an asymmetry cutoff 20%. We determined the postural control ability of the subjects using InBody posturography, Berg Balance Scale (BBS), Timed Up and Go test (TUG) and Short Physical Performance Battery (SPPB). The sway index (SI) of the subjects in four positions was assessed using posturography.
Results: The group with asymmetric strength presented a significantly higher SI than the group with symmetric strength, in the normal position with eyes open and eyes open on pillows. In the normal position with the eyes closed and in postures with the eyes closed on pillows, the statistical analysis revealed no significant differences between the two groups. The three tests for physical performance (BBS, TUG, and SPPB) show no statistically significant difference between the two groups.
Conclusion: The asymmetric strength group showed a significantly lower balance than the group with symmetric strength based on several posturographic parameters. Ambulatory elderly individuals with asymmetry in knee extension strength, showed deficits in balance control even in normal clinical tests.
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KEYWORD
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Elderly, Postural asymmetry factor, Postural balance, Accidental falls
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