Impact of the Changes in the Frequency of Social Participation on All-Cause Mortality in Japanese Older Adults: A Nationwide Longitudinal Study

Previous studies have shown that more frequent social participation was associated with a reduced risk of mortality. However, limited studies have explored the changes in the frequency of social participation in older adults. We investigated the impact of the changes in the frequency of social participation on all-cause mortality in Japanese older adults aged 60 years and older. The current study, conducted as a secondary analysis, was a retrospective cohort study using open available data. The participants were 2240 older adults (45.4% male and 54.6% female) sampled nationwide from Japan who responded to the interview survey. Changes in the frequency of social participation were categorized into four groups (none, initiated, decreased, and continued pattern) based on the responses in the baseline and last surveys. The Cox proportional-hazards model showed a decreased risk of all-cause mortality in decreased and continued patterns of social participation. Stratified analysis by sex showed a decreased risk of mortality in the continued pattern only among males. The results of the current study suggest that the initiation of social participation at an earlier phase of life transition, such as retirement, may be beneficial for individuals.

Meaningful Activities and Psychosomatic Functions in Japanese Older Adults after Driving Cessation

The purpose of this cross-sectional study was to analyse the differences in meaningful activities and psychosomatic function depending on the driving status of community-dwelling older adults. Data from 594 older adults were obtained, including activities meaningful to individuals and psychosomatic functions, such as grip strength, depression, cognitive function, and ability of activity. Participants were divided into active driving (n = 549) and after driving cessation (n = 45) groups. In addition, the active driving group was operationally divided into three groups: high-frequency group (n = 387), medium group (n = 119), and infrequent group (n = 42). In the after driving cessation group, grip strength, and Japan Science and Technology Agency Index of Competence scores were significantly lower. Furthermore, the proportion of apathy and physical and social frailty was significantly higher in the after driving cessation group. Regarding meaningful activity, domestic life scores in the after driving cessation group were significantly higher than those of the active driving group. Decreased driving frequency in the active driving group was associated with weak muscle strength, lack of interest, and low activity. This study demonstrated that meaningful activity differed based on the driving status. Hence, we should support the activities of older adults who are considering driving cessation.

Low Friend Connection Leads to Low Functional Capacity of Older Adults: Findings From a 2-year Longitudinal Study

Maintaining personal connections in geriatric years is important to sustain the functional capacity of older adults. In this study, we define the term functional capacity as the ability to perform tasks and activities necessary for one’s independent life. Meanwhile, the type of personal connection and its effect on functional capacity remain unclear. We classified personal connections into connections with family or friends and examined their association with the functional capacity of independently living Japanese older adults. A two-year longitudinal study (2016 and 2018) was conducted using data from the Kashiwa Cohort Study. The amount of personal connections was determined using the Lubben Social Network Scale. The Japan Science and Technology Agency Index of Competence was used to assess participants’ functional capacity. The change in functional capacity was analyzed by binomial logistic regression analysis (N=638, reference: group with high family and friend connection). The results showed a decline in the functional capacity of the group with low friend and family connections (odds ratio (OR): 0.48, 95%CI: 0.29–0.82). This trend was also seen for the group with a high family connection but low friend connection (OR: 0.43, 95%CI: 0.24–0.78). Meanwhile, there was no significant difference between the reference group and the group with low family but high friend connection (OR: 0.85, 95%CI: 0.47–1.56). The results imply the importance of having a friend for sustainable functional capacity in old age. Interventions that facilitate friend-to-friend interactions or promote new friendships among older adults can be considered as support strategies.

Transition to Widowhood: Trajectories of Depressive Symptomatology Among Japanese Older Adults

Spousal loss is one of the most consequential negative life events for the surviving partners. While there is abundant research on mental health and well-being of widows, most of these studies rely on the post-bereavement data. In this study, we use the data from the National Survey of Japanese Elderly (NSJE), which is a publicly available longitudinal data set collected from Japanese adults aged 60 years and older. The current study uses the first seven waves of data from 1987 to 2006, where participants were followed every three to four years. Using the NSJE advances our understanding of the bereavement process as it allows us to observe the levels and trajectories of depressive symptom before, during, and after the loss of their spouses. In our analyses, we selected 522 participants (average age at bereavement: 75.0 years; 27% male) who experienced spousal loss at some point during the seven waves. We examined the trajectories of depressive symptoms assessed using CES-D as these participants transition to widowhood. The results showed a small significant increase in depressive symptoms leading up to the time of the loss. There was also a significant increase in symptoms at the time of the loss, but we did not observe any decline in symptoms after the loss. In addition, we found that their age at bereavement significantly moderated the pattern, such that the increase in depressive symptoms at the time of the loss was attenuated for older participants. The implications of these findings will be discussed.

Relationship Between Tongue Strength and Dysphagia Symptoms in Japanese Older Adults in Need of Care

Purpose: The purpose of this study was to measure the tongue pressure of older adults who require nursing care and to clarify the relationship between dysphagia symptoms and tongue strength. Methods: The participants were Japanese older adults (age: ≥ 65 years) in need of care who were able to communicate with others and agreed to participate in the study. Tongue pressure was measured using TPM-01, a tongue pressure measuring instrument. The Dysphagia Risk Assessment for Community-Dwelling Elderly was used to assess dysphagia. The association between tongue pressure and 12 dysphagia symptoms was analyzed using a one-way analysis of variance. Results: The average tongue pressure was 23.22 ± 9.9 kPa. Tongue pressure was significantly associated with occasional food spillage from the mouth and sputum formation in the throat during meals or after eating or drinking (p < 0.05). Conclusions: Decreased tongue strength should be suspected in older adults with food spillage from the mouth or sputum formation in the throat during meals.