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 (∼25% vs ∼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.
|Number of pages
|Journals of Gerontology - Series A Biological Sciences and Medical Sciences
|Published - Apr 2010
Bibliographical noteFunding Information:
This study was supported by a grant from the Retirement Research Foundation (L.I.e.O., 2001-056) and a post-doctoral fellowship (I.M.) from the National Institute on Disability and Rehabilitation Research.
- Dual task
- Step response time
ASJC Scopus subject areas
- General Medicine