Sains Malaysiana 45(9)(2016): 1351–1355
Cognitive Health of Older Persons
in Longitudinal Ageing Cohort Studies
(Kajian Kohort Penuaan Longitud Kesihatan
Kognitif dalam Kalangan Warga Emas)
NG TZE
PIN*
Department of Psychological Medicine
and Gerontology Research Programme, Yong Yoo Lin School of Medicine,
National University of Singapore, 21 Lower Kent Ridge Road, 119077
Singapore
Diserahkan: 21
Disember 2015/Diterima: 13 Mei 2016
ABSTRACT
Dementia poses a major global
burden of care to society and health systems in ageing populations.
The majority (over 60%) of persons with dementia in the world are
found in Asia and developing countries with rapid rates of population
ageing. Improving and maintaining the cognitive health of older
persons is vital to national strategies for dementia prevention.
Increasing numbers of population-based ageing cohort studies in
the past decade have provided a better understanding of the factors
that contribute to cognitive function and decline in old age. The
roles of major demographic, psychosocial, lifestyle, behavioral
and cardiovascular risk factors contributing to cognitive health
were discussed using examples from the Singapore Longitudinal Ageing
Studies. They include socio-demographic factors, particularly education
and marital status, leisure time activity such as physical activity,
social engagement and mental activities, psychological factors such
as depression, cardiovascular and metabolic risk factors: obesity,
diabetes, hypertension and dyslipidemia, and the metabolic syndrome,
under-nutrition, low albumin, low hemoglobin, nutritional factors
such as blood folate, B12 and homocysteine, omega-3 poly-unsaturated
fatty acids, tea drinking and curcumin-rich turmeric in curry meals.
These factors are found to be associated variously with cognitive
functions (memory and learning, language, visuospatial, attention
and information processing speed), rates of cognitive impairment
and cognitive decline, or increased risk of developing MCI and progression to dementia.
Keywords: Aging; cognitive
function; dementia; older adult; risk factor
ABSTRAK
Secara global, demensia menjadi
beban jagaan utama terhadap masyarakat dan sistem kesihatan dalam
kalangan populasi tua. Lebih daripada 60% individu yang mempunyai
masalah demensia terdiri daripada masyarakat negara Asia serta negara-negara
membangun yang mempunyai kadar kenaikan populasi tua yang mendadak.
Langkah meningkatkan dan mengekalkan kesihatan mental bagi warga
emas merupakan strategi yang amat penting sebagai pencegahan masalah
demensia. Peningkatan jumlah kajian kohot berkenaan populasi ini
telah meningkatkan pemahaman terhadap faktor yang boleh mempengaruhi
fungsi kognitif dan penurunan fungsi kognitif di usia tua. Faktor
yang mempengaruhi kesihatan kognitif yang dibincangkan adalah berdasarkan
Kajian Penuaan Longitud Singapura iaitu faktor demografi, psikososial,
gaya hidup, tingkah laku dan risiko kardiovaskular. Faktor sosiodemografi
termasuklah pendidikan dan status perkahwinan manakala aktiviti
masa lapang melibatkan aktiviti fizikal, penglibatan sosial dan
aktiviti yang menggunakan daya mental. Faktor signifikan melibatkan
psikososial seperti kemurungan bersama faktor risiko kardiovaskular
dan metabolik termasuklah obesiti, diabetes, hipertensi dan dislipidemia
dan sindrom metabolik, kekurangan nutrisi, paras albumin serta hemoglobin
yang rendah. Selain itu, faktor pemakanan seperti paras folat dalam
darah, B12 dan homosisteina, omega-3 asid lemak poli tak tepu, pengambilan
minuman teh dan kunyit yang tinggi kandungan kurkumin dalam masakan
berasaskan kari didapati penting. Faktor ini berkait dengan pelbagai
fungsi kognitif (memori dan pembelajaran, bahasa, visuoreruang,
perhatian dan kelajuan pemprosesan maklumat), kadar gangguan dan
penurunan fungsi kognitif atau peningkatan risiko kemerosotan kognitif
ringan dan progresi kepada masalah demensia.
Kata kunci: Demensia; faktor risiko; fungsi kognitif; penuaan; warga
emas
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*Pengarang untuk surat-menyurat; email:
pcmngtp@nus.edu.sg
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