Journal
ARCHIVES OF GERONTOLOGY AND GERIATRICS
Volume 56, Issue 1, Pages 118-123Publisher
ELSEVIER IRELAND LTD
DOI: 10.1016/j.archger.2012.08.017
Keywords
Aging; Cerebral oxygenation; Life-space; Cognition
Categories
Funding
- Japanese Ministry of Health, Labor and Welfare [B-3]
- Japan Society for the Promotion of Science [23-9862]
- Grants-in-Aid for Scientific Research [24650453] Funding Source: KAKEN
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This study sought to investigate the relationship between going outdoor daily and prefrontal cortex activation during execution of the VFT using near-infrared spectroscopy (NIRS) in community-dwelling older adults. Blood oxygenation changes in left and right prefrontal cortices were measured in twenty older adults (mean age 76.1 +/- 6.7 years) by NIRS during VFT performance. In this task, participants were required to pronounce as many nouns as possible beginning with the letters Shi, I, and Re. Changes in oxygenated hemoglobin (oxy-Hb) levels during the VFT were compared between two groups defined by the frequency of going outdoors: daily or non-daily within a week. Participants in both groups exhibited significantly increased oxy-Hb levels in the left and right prefrontal cortices during the VFT compared to a resting baseline condition. After controlling for age and gender, there were significant group-by-condition interactions on oxy-Hb levels with less activation during the execution of the VFT over both cortices in the non-daily group (left: F = 4.76, p = 0.04; right: F = 6.32, p = 0.02). These findings indicate that going outdoors daily is associated with increased activation in the prefrontal cortices during VFT performance in community-dwelling older adults. (C) 2012 Elsevier Ireland Ltd. All rights reserved.
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