Do Older Adults Perceive Postural Constraints for Reach Estimation?

HYPOTHESIS; ANALYSIS of variance; CHI-squared test; COMPARATIVE studies; COMPUTER-aided design; EXPERIMENTAL design; RANGE of motion of joints; POSTURE; RESEARCH funding; SENSORIMOTOR integration; SITTING position; STANDING position; BODY movement; DESCRIPTIVE statistics; OLD age

Background/Study Context: Recent evidence indicates that older persons have difficulty mentally representing intended movements. Furthermore, in an estimation of reach paradigm using motor imagery, a form of mental representation, older persons significantly overestimated their ability compared with young adults. The authors tested the notion that older adults may also have difficulty perceiving the postural constraints associated with reach estimation. Methods: The authors compared young (Mage = 22 years) and older (Mage = 67) adults on reach estimation while seated and in a more postural demanding standing and leaning forward position. The expectation was a significant postural effect with the standing condition, as evidenced by reduced overestimation. Results: Whereas there was no difference between groups in the seated condition (both overestimated), older adults underestimated whereas the younger group once again overestimated in the standing condition. Conclusion: From one perspective, these results show that older adults do perceive postural constraints in light of their own physical capabilities. That is, that group perceived greater postural demands with the standing posture and elected to program a more conservative strategy, resulting in underestimation. [ABSTRACT FROM AUTHOR]

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