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Experimental Aging Research
An International Journal Devoted to the Scientific Study of the Aging Process
Volume 31, 2005 - Issue 4
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Original Articles

An Invariant Guiding Stair Descent by Young and Old Adults

Pages 441-455 | Received 19 Dec 2003, Accepted 15 Jun 2004, Published online: 23 Feb 2007
 

ABSTRACT

In this study the author compared the perception-action capability of young and old adults (respectively, mean age 22 and 62 years old) when descending stairs and examined the relevant task constraints that guide the action. It was found that old adults selected and descended stairs that were significantly lower than young adults and showed less hip joint flexibility. However, the performance parameter, defined as the ratio between the height of the stair and the distance taken by the stepping foot to the top edge of the stair, was invariant for both groups. Thus, despite different ability levels, young and old adults are constrained by the same perception-action invariant for guiding the act of stair descent.

The author was supported by grant MURST60%. She thanks Federico Formenti for his assistance with data collection. The author thanks the referees for the many helpful comments and constructive criticisms.

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