PMID: 8951314Dec 1, 1996Paper

Long latency ankle responses to dynamic perturbation in older fallers and non-fallers

Journal of the American Geriatrics Society
B N SmithS L Wolf

Abstract

The purpose of this study was to examine the effects of falling history and aging on the latency and magnitude of long latency responses in the lateral gastrocnemius (LG) and tibialis anterior (TA) muscles of older adults. Single observation study. Emory University School of Medicine, Center for Rehabilitation Medicine, serving the greater Atlanta, Georgia, area. There were 62 community-dwelling adults aged 60 or older, 32 with a history of two or more unexplained falls in the past year and 30 with no history of falls in the past year. The electromyographic activity of the gastrocnemius and tibialis anterior muscles was recorded bilaterally during repeated 10 degree dorsiflexion perturbations to standing subjects at the acceleration of gravity and a velocity of approximately 100 deg/sec. The latency and magnitude of the long latency EMG responses (LLR) of both muscles were determined and compared between individuals by falls history and by decades of age. No significant differences between falls status groups existed for mean LLR latencies or magnitudes of either LG or TA. Attenuation of the LLR throughout the trials was significantly different between groups. Non-fallers demonstrated attenuation of the LG magnitude over the fi...Continue Reading

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Citations

Feb 24, 2009·Journal of Intellectual & Developmental Disability·Leigh HaleAndrew Gray
Apr 9, 2001·Aging : Clinical and Experimental Research·D A RiosJ M Hausdorff
May 26, 1999·American Journal of Physical Medicine & Rehabilitation·L W Lee, D C Kerrigan

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