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Cognitive load affects lower limb force-time relations during voluntary rapid stepping in healthy old and young adults
Melzer, I., Liebermann, D. G., Krasovsky, T., & Oddsson, L. I. E. (2010). Cognitive load affects lower limb force-time relations during voluntary rapid stepping in healthy old and young adults. J Gerontol A Biol Sci Med Sci, 65(4), 400–406.
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.
Cognitive load affects lower limb force-time relations during voluntary rapid stepping in healthy old and young adultsMelzer, I.Liebermann, D.G.Krasovsky, T.Oddsson, L.I.E.info:doi/10.1093/gerona/glp185info:pmid/19939911openurl:?ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fhttps%3A%2F%2Frefbase.nfshost.com%2F&genre=article&atitle=Cognitive%20load%20affects%20lower%20limb%20force-time%20relations%20during%20voluntary%20rapid%20stepping%20in%20healthy%20old%20and%20young%20adults&title=The%20Journals%20of%20Gerontology.%20Series%20A%2C%20Biological%20Sciences%20and%20Medical%20Sciences&stitle=J%20Gerontol%20A%20Biol%20Sci%20Med%20Sci&issn=1079-5006&date=2010&volume=65&issue=4&spage=400&epage=406&aulast=Melzer&aufirst=I.&au=Liebermann%2C%20D.G.&au=Krasovsky%2C%20T.&au=Oddsson%2C%20L.I.E.&id=info%3Adoi%2F10.1093%2Fgerona%2Fglp185&sid=refbase%3AJFcitekey:Melzer_etal2010Melzer, I., Liebermann, D. G., Krasovsky, T., & Oddsson, L. I. E. (2010). Cognitive load affects lower limb force-time relations during voluntary rapid stepping in healthy old and young adults. J Gerontol A Biol Sci Med Sci, 65(4), 400-406.2010JournalArticletext*Accidental FallsAdultAgedAged, 80 and overAging/*physiologyAttention/physiologyCognition/*physiologyGait/*physiologyHumansPostural Balance/*physiologyReaction Timeurl:http://www.ncbi.nlm.nih.gov/pubmed/19939911English1079-5006The Journals of Gerontology. Series A, Biological Sciences and Medical Sciences2010654400406