Vivian Isaac - Academia.edu (original) (raw)
Papers by Vivian Isaac
Frontiers in aging neuroscience, 2011
The American journal of geriatric psychiatry : official journal of the American Association for Geriatric Psychiatry, 2013
Human Resources for Health, 2014
The American journal of geriatric psychiatry : official journal of the American Association for Geriatric Psychiatry, 2009
Journal of Applied Gerontology, 2011
This article reports a preliminary investigation in India of the association between caregiver bu... more This article reports a preliminary investigation in India of the association between caregiver burden and quality of life (QOL) in older persons with stroke after controlling for disability, depression, and sociodemographic factors. A cross-sectional analysis was carried out with 46 stroke patients attending a community hospital in India. The primary outcome variable was patient QOL assessed using the World Health
Frontiers in aging neuroscience, 2011
The link between central adiposity and cognition has been established by indirect measures such a... more The link between central adiposity and cognition has been established by indirect measures such as body mass index (BMI) or waist–hip ratio. Magnetic resonance imaging (MRI) quantification of central abdominal fat has been linked to elevated risk of cardiovascular and cerebro-vascular disease. However it is not known how quantification of visceral fat correlates with cognitive performance and measures of brain structure. We filled this gap by characterizing the relationships between MRI measures of abdominal adiposity, brain morphometry, and cognition, in healthy elderly. Methods: A total of 184 healthy community dwelling elderly subjects without cognitive impairment participated in this study. Anthropometric and biochemical markers of cardiovascular risk, neuropsychological measurements as well as MRI of the brain and abdomen fat were obtained. Abdominal images were segmented into subcutaneous adipose tissue and visceral adipose tissue (VAT) adipose tissue compartments. Brain MRI measures were analyzed quantitatively to determine total brain volume, hippocampal volume, ventricular volume, and cortical thickness. Results: VAT showed negative association with verbal memory (r = 0.21, p = 0.005) and attention (r = 0.18, p = 0.01). Higher VAT was associated with lower hippocampal volume (F = 5.39, p = 0.02) and larger ventricular volume (F = 6.07, p = 0.02). The participants in the upper quartile of VAT had the lowest hippocampal volume even after adjusting for age, gender, hypertension, and BMI (b = −0.28, p = 0.005). There was a significant age by VAT interaction for cortical thickness in the left prefrontal region. Conclusion: In healthy older adults, elevated VAT is associated with negative effects on cognition, and brain morphometry.
Frontiers in aging neuroscience, 2011
The American journal of geriatric psychiatry : official journal of the American Association for Geriatric Psychiatry, 2013
Human Resources for Health, 2014
The American journal of geriatric psychiatry : official journal of the American Association for Geriatric Psychiatry, 2009
Journal of Applied Gerontology, 2011
This article reports a preliminary investigation in India of the association between caregiver bu... more This article reports a preliminary investigation in India of the association between caregiver burden and quality of life (QOL) in older persons with stroke after controlling for disability, depression, and sociodemographic factors. A cross-sectional analysis was carried out with 46 stroke patients attending a community hospital in India. The primary outcome variable was patient QOL assessed using the World Health
Frontiers in aging neuroscience, 2011
The link between central adiposity and cognition has been established by indirect measures such a... more The link between central adiposity and cognition has been established by indirect measures such as body mass index (BMI) or waist–hip ratio. Magnetic resonance imaging (MRI) quantification of central abdominal fat has been linked to elevated risk of cardiovascular and cerebro-vascular disease. However it is not known how quantification of visceral fat correlates with cognitive performance and measures of brain structure. We filled this gap by characterizing the relationships between MRI measures of abdominal adiposity, brain morphometry, and cognition, in healthy elderly. Methods: A total of 184 healthy community dwelling elderly subjects without cognitive impairment participated in this study. Anthropometric and biochemical markers of cardiovascular risk, neuropsychological measurements as well as MRI of the brain and abdomen fat were obtained. Abdominal images were segmented into subcutaneous adipose tissue and visceral adipose tissue (VAT) adipose tissue compartments. Brain MRI measures were analyzed quantitatively to determine total brain volume, hippocampal volume, ventricular volume, and cortical thickness. Results: VAT showed negative association with verbal memory (r = 0.21, p = 0.005) and attention (r = 0.18, p = 0.01). Higher VAT was associated with lower hippocampal volume (F = 5.39, p = 0.02) and larger ventricular volume (F = 6.07, p = 0.02). The participants in the upper quartile of VAT had the lowest hippocampal volume even after adjusting for age, gender, hypertension, and BMI (b = −0.28, p = 0.005). There was a significant age by VAT interaction for cortical thickness in the left prefrontal region. Conclusion: In healthy older adults, elevated VAT is associated with negative effects on cognition, and brain morphometry.