Persistent infection, inflammation, and functional impairment in older Latinos.
BACKGROUND
The objective of this study was to examine whether cytomegalovirus (CMV), herpes simplex virus type-1 (HSV-1), and C-reactive protein (CRP) are associated with functional impairment in older Latinos.


METHODS
A cross-sectional analysis of a cohort study was conducted with a community-dwelling elderly population. The sample was a subset (N = 1559/1789) of participants in the Sacramento Area Latino Study on Aging (SALSA) ages 60-101 with available serum samples and functional impairment measures. Baseline serum samples were assayed for levels of immunoglobulin G antibodies to CMV and HSV-1 and for levels of CRP. Several measures were used to assess functional impairment, including activities of daily living (ADL), instrumental activities of daily living (IADL), and walking pace.


RESULTS
CMV and CRP showed statistically significant graded associations with ADL functional impairment, even after controlling for age and gender. The relationship between CMV and ADL was slightly attenuated, and the confidence interval contained the null value when adjusted for total number of health conditions, body mass index, and household income. Only high levels of CRP were significantly related to ADL and IADL impairment even after adjusting for all other covariates.


CONCLUSIONS
Inflammation is clearly linked to physical functioning among aging Latinos. This study also suggests a role for CMV infection in relation to ADL impairment. Further research examining the influence of infection, immune response, and inflammation on longitudinal trajectories of physical functioning is warranted.
Department of Epidemiology, Center for Social Epidemiology & Population Health, 1214 S. University, 2nd Floor, Ann Arbor, MI 48104-2548, USA. aielloa@umich.edu
Allison E
AE
Aiello
Mary N
MN
Haan
Christine M
CM
Pierce
Amanda M
AM
Simanek
Jersey
J
Liang
D000203:Activities of Daily Living; D000368:Aged; D000369:Aged, 80 and over; D015992:Body Mass Index; D002097:C-Reactive Protein / Q000032:analysis*; D003430:Cross-Sectional Studies; D003586:Cytomegalovirus Infections / Q000503:physiopathology*; D005260:Female; D006561:Herpes Simplex / Q000503:physiopathology*; D018259:Herpesvirus 1, Human; D006630:Hispanic or Latino; D006801:Humans; D007182:Income; D008297:Male; D008875:Middle Aged; D016138:Walking / Q000502:physiology*
D002097:C-Reactive Protein