Till Örebro universitet

Well-being (WB) is a complex variable in its relation to physical health and other personal and social characteristics. The aim was to study subjective well-being (SWB) and its possible associations with traditional biomarkers of cardiovascular risk or dementia, in Swedish seniors. SWB was estimated by the Psychological General Well-Being (PGWB) index in two study groups. The active seniors (AS) group consisted of community-dwelling elderly Swedes leading an active life (n=389). The DGM cohort (n=300) consisted of subjects referred to the Memory Unit at the Department of Geriatrics, the cognitive problems had to be subjective, mild or moderate (MMSE≥10). There were differences in all six subdimensions of SWB or distress, and in the sum of PGWB scores, between the two study groups (p<0.001 for all), and adjustment for differences in biomarkers of somatic health (age, sex, blood pressure, BMI, HDL cholesterol, ApoB/ApoA1 ratio, creatinine, and homocysteine) did not attenuate these differences. In addition, cognition as assessed by the Clock-Drawing Test (CDT) showed independent associations with four of the PGWB subdimensions and with the PGWB sum. Among the subjects in the DGM cohort, SWB was equally low among subjects with an MCI (minor cognitive impairment) diagnosis or without a dementia diagnosis as among subjects diagnosed with dementia disorder. We conclude that the nosological grouping variable (AS vs. DGM cohort) and a cognitive factor were the main independent predictors of SWB in this sample of elderly Swedes, whereas biomarkers of somatic health played a subordinated role.

OBJECTIVE: To modify the self-administered, short version of the International Physical Activity Questionnaire (IPAQ) for adults to be used in the elderly (aged 65 years and above), and to validate this modified IPAQ for the elderly (IPAQ-E).

DESIGN: A direct validity study using accelerometer-measured physical activity (PA) as the criterion measure, and an indirect criterion validity study using high-sensitivity C-reactive protein (hs-CRP) as a biological marker of activity.

SETTING: Organisations for retired persons in Sweden.

SUBJECTS: The direct validity study consisted of fifty-four participants and the indirect criterion validity study consisted of 359 participants. All participants were retired persons (66-91 years) living independently.

RESULTS: All self-reported activity domains (sitting, walking, moderate and vigorous) were positively correlated with the corresponding variable objectively assessed by an accelerometer (rho = 0.277-0.471), but a systematic error was observed. The specificity of IPAQ-E to identify low-active participants was 85 %, and the sensitivity to identify the more active participants was 81 %. A main effect of IPAQ-E category (Low, Moderate or High) was observed for hs-CRP (P = 0.041).

CONCLUSIONS: We found this modified version of IPAQ, the IPAQ-E, to be well accepted by our sample of socially active elderly. It provided acceptable estimates of PA, well in line with other questionnaires, even though it had a systematic error. The IPAQ-E was able to identify an expected response of a biomarker (hs-CRP) to PA. We recommend the use of the IPAQ-E to classify participants aged 65 years and above into PA categories, to rank individuals or to identify individuals meeting certain PA criteria.

Background: Physical activity is claimed to be related to well-being and to a lower risk of cardiovascular disease. Therefore, the possible associations of well-being with physical activity and biomarkers of somatic health were studied in a sample of Swedish active seniors to determine the strength of these associations.

Methods: Three hundred and eighty-nine community-dwelling senior citizens (127 men and 262 women) of mean age 74 +/- 5 years were recruited for this cross-sectional population study. Serum samples were analyzed for lipoproteins and markers of inflammation. The Psychological General Well-Being (PGWB) index was used to measure subjective well-being. Physical activity was assessed by the International Physical Activity Questionnaire modified for the elderly.

Results: More than 50% of men and women rated their physical activity as high; in the women, there was a significant difference between the age groups (younger and older than the median age [median =74.1 years], respectively). The mean PGWB index indicates a high degree of subjective well-being in this group of Swedish seniors. Of the PGWB subdimensions, general health had the strongest positive relationship with physical activity (r(2)=5.4%). for the subdimensions of depressed mood, positive well-being, vitality, and PGWB index, physical activity had an r(2)<= 4%, while the contributions of sex, age, and biomarkers were minor.

Conclusion: We have estimated the contribution of physical activity to the variance of subjective well-being in active seniors. Physical activity appears to play a greater role as a determinant of subjective well-being than do biomarkers of somatic health, especially in females, but most of the variance remained unaccounted for by the studied variables.

Results: There were no significant differences in cystatin C and eGFR values between the two cohorts: cystatin C medians 0.88 vs 0.86 mg/L and eGFR 73 vs 80 mL/min/1.73 m2(AS vs DGM). In the AS cohort cystatin C was negatively related to PGWB index in women (P &lt; 0.001, R 2≈ 5%), and the covariates age and BMI did not improve the models. The renal biomarkers were unrelated to the PGWB index in the DGM cohort. Cystatin C in the AS cohort was adversely related to the PGWB subdimensions anxiety, depressed mood, positive well-being, and vitality in women, but in men only to depressed mood (P &lt; 0.006; R 2≈ 6%). In the DGM cohort, depressed mood in men was also significantly related to cystatin C (P = 0.050), but not in women.

Background: During our whole life span, factors influencing health and functioning are accumulated. In chronic kidney disease, quality of life is adversely affected. We hypothesized that biomarkers of renal function could also be determinants of subjective well-being (SWB) in Swedish elderly subjects. SWB was assessed by the Psychological General Well-Being index (PGWB index) in two study groups: Active seniors (AS) consisted of community-dwelling elderly Swedes leading an active life (n = 389), and the DGM cohort (n = 300) consisted of subjects referred to the Memory Unit at the Department of Geriatrics for memory problems, Serum creatinine, cystatin C, and eGFR (CKD-EPI) were used as biomarkers of renal function.

Conclusions: Renal function even within the normal range, measured by serum cystatin C concentration, has significant and sex specific associations with subjective well-being and its subdimensions in healthy elderly subjects. Maintenance of good renal function in aging may be of importance in maintaining a high subjective well-being.

Background: During normal aging dopaminergic neuromodulation declines and this has been associated with impaired cognitive function and negative and positive affects. A common polymorphism (rs4680; Val/Met) in the enzyme catechol-O6-methyltransferase (COMT) gene is a determinant of the rate of elimination of dopamine and noradrenaline in the prefrontal cortex, and is therefore thought to modulate dopaminergic signaling.

The aim of the present study was to test whether subjective well-being (SWB) was influenced by interactions between COMT rs4680 genotype, sex, physical activity (PA), and serum biomarkers of somatic health.

Methods: We studied 389 community dwelling, socially active seniors, mean age 74 years and M/F 127/262 (AS cohort). COMT was genotyped by pyrosequencing, PA was assessed by the IPAQ-E, and SWB by the PGWB index.

Results: Male carriers of the rs4680 Met-allele had significantly better SWB than subjects with the ancestral wildtype Val/Val (p=0.009), also when adjusting for age, homocysteine, HbA1c, cystatin C, and IPAQ-E score (p=3.8×10 -5). There was a strong interaction between PA and the rs4680 polymorphism (p=0.001). In women on the other hand the COMT genotype was unrelated to PGWB sum and its subdimensions,

Conclusion: In socially active, elderly retired men, COMT genotype has a major influence on SWB, partly mediated by an interaction with physical activity. This finding should help implementing better public health intervention strategies by tailoring the interventions at appropriately selected subgroups.