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1.1 1 xml info:srw/schema/1/mods-v3.2 Melzer I author Liebermann D G author Krasovsky T author Oddsson L I E author 2010 English BACKGROUND: Quick step execution may prevent falls when balance is lost; adding a concurrent task delays this function. We investigate whether push-off force-time relations during the execution of rapid voluntary stepping is affected by a secondary task in older and young adults. METHODS: Nineteen healthy older adults and 12 young adults performed rapid voluntary stepping under single- and dual-task conditions. Peak power, peak force, and time to peak force during preparatory and swing phases of stepping were extracted from center of pressure and ground reaction force data. RESULTS: For dual-task condition compared with single-task condition, older adults show a longer time to reach peak force during the preparation and swing phases compared with young adults (approximately 25% vs approximately 10%, respectively). Peak power and peak force were not affected by a concurrent attention-demanding task. CONCLUSION: Older adults have difficulty allocating sufficient attention for fast muscle recruitment when concurrently challenged by an attention-demanding task. *Accidental Falls Adult Aged Aged 80 and over Aging/*physiology Attention/physiology Cognition/*physiology Gait/*physiology Humans Postural Balance/*physiology Reaction Time PMID:19939911 exported from refbase (https://refbase.nfshost.com/show.php?record=50), last updated on Wed, 30 Jan 2013 08:58:27 +0000 text http://www.ncbi.nlm.nih.gov/pubmed/19939911 http://www.ncbi.nlm.nih.gov/pubmed/19939911 10.1093/gerona/glp185 19939911 Melzer_etal2010 2010 continuing periodical academic journal 65 4 400 406 1079-5006 1