Prevalence and characteristics of frailty in older adults in Japan: a cross-sectional study using data from the long-term care insurance system.

[Purpose] Owing to rapid population aging, prevention of frailty in older adults and minimizing the burden on the long-term care insurance system are priorities for the Japanese government. However, limited data are available regarding the prevalence and characteristics of frailty among older adults requiring support in Japan. In this study, we investigated the prevalence and characteristics of frailty in older adults requiring support in Japan. [Participants and Methods] The study included 695 new users of preventive long-term care services certified as "requiring support" between 2011 and 2019. In this cross-sectional investigation, we used data obtained from a community comprehensive support center. Frailty prevalence was assessed using the Kihon Checklist, followed by a χ2 test. Logistic regression analysis was performed to identify the characteristics (basic information and service type) associated with frailty. [Results] A significantly large percentage of robust/pre-frail participants (72.7%) belonged to urban areas, although we observed no significant difference in robust participants with regard to residence. Furthermore, we observed significant intergroup differences in age and orthopedic conditions. [Conclusion] It is important to encourage older adults to access the long-term care insurance system and seek support at an early stage.

Association between Internet Use and Locomotive Syndrome, Frailty, and Sarcopenia among Community-Dwelling Older Japanese Adults.

In the lives of those who are the target of community health nursing, it is important to collaborate with individuals and communities to improve their quality of life. Herein, we aimed to determine the association between Internet use among older individuals and locomotive syndrome (LS), frailty, and sarcopenia. In this cross-sectional study conducted between July 2022 and March 2023, we recruited 105 community-dwelling older Japanese adults who participated in a care prevention project called "Kayoi-no-ba". All participants were divided into Internet and non-Internet user groups according to the classification of a previous study. We assessed LS (standing test, two-step test, and five-question Geriatric Locomotive Function Scale), frailty (through the Questionnaire for Medical Checkup of Old-Old), and sarcopenia (grip strength, normal walking speed, and skeletal muscle mass index) and made group comparisons between Internet users and non-users. Binomial logistic regression analyses were performed with Internet use as the independent variable and sarcopenia or LS as the dependent variables. The Internet and non-Internet user groups had 69 and 36 participants, respectively. The Internet user group comprised 65.7% of all participants, which was similar to that reported in a previous study of the same age group. Between-group comparisons showed significant differences in sarcopenia and LS items, whereas adjusted binomial logistic analysis showed a significant association between sarcopenia and Internet use. In summary, among LS, frailty, and sarcopenia, sarcopenia showed the highest association with Internet use. Older adults without sarcopenia having good physical functions, such as grip strength, walking speed, and skeletal muscle index, more likely used the Internet; while older adults with sarcopenia were less likely to use the Internet. This implied that Internet use may be associated with physical function.

Prevalence and factors associated with changes in frailty among community-dwelling older adults in Japan during the COVID-19 pandemic: A prospective cohort study from 2020 to 2022.

AIM: This study aimed to ascertain the prevalence of frailty during the pandemic and to determine factors associated with changes in frailty status. METHODS: In May-June of 2020-2022, we assessed the frailty of 549 participants using the Kihon Checklist. Furthermore, we classified participant residences as urban, suburban, and rural and investigated participants' engagement in hobbies and community activities in 2020 and 2022. Cochran's Q test was used to analyze the proportions of frailty status. Subsequently, we conducted a binomial logistic regression analysis with the improvement/deterioration of frailty status from 2020 to 2022 as the dependent variable, and engagement in hobbies and community activities as the independent variables. RESULTS: Significant changes were observed among participants in urban areas, where an increase in pre-frailty and a decrease in robust individuals from 2020 to 2021 were noted. Focusing on item no. 17 (going out), the decreasing frequency had recovered by 2022 in the group of all groups. Continued engagement in only hobbies or only community activities, and continued engagement in both were associated with remained robust/frailty-status improvement. Moreover, not engaging in either hobbies or community activities was associated with remained frail/frailty-status deterioration. CONCLUSIONS: During the early stages, the COVID-19 pandemic impacted the frailty of older adults in densely populated areas. The results also suggest an attenuation in the decline in older adult activity in 2022. Continuous engagement in hobbies and community activities was crucial for improving and preventing deterioration in frailty status during the COVID-19 pandemic. Geriatr Gerontol Int 2024; 24: 40-47.

Relationship between Total Kihon Checklist Score and Age-Specific Deaths among Late-Stage Older Adults in Otawara City (Aged 75 and Older) over a 15-Year Period.

INTRODUCTION: While the Japanese long-term care insurance system supports an ageing society, there are concerns about the shortage of financial resources and labour force. Further, extending healthy life expectancy and narrowing the gap with the average life expectancy are important issues. In this study, we aimed to examine, over a 15-year period, the relationship between the total Kihon Checklist (t-KCL) score and age-specific deaths among late-stage older adults aged 75 and older who were not certified for long-term care insurance. METHODS: The participants were older adults residing in Otawara City, Tochigi Prefecture, who were aged 75 years or older as of 2006. The participants, who were not certified by the long-term care insurance system, were asked to complete the KCL by a community welfare committee member. Based on their t-KCL scores, the participants were classified as robust (0-3 points), pre-frail (4-7 points), and frail (≥8 points). The deaths of those aged 75-89 years who had completed the KCL were investigated. Information on deaths was obtained from local authorities. Statistics were examined for the risk of robust, pre-frail, and frail mortality using a Cox proportional hazards model with age and gender as covariates for the 75-79, 80-84, and 85-89 age groups. RESULTS: Of the 7,924 participants, 3,423 (75-79 years: 1,990, 80-84 years: 1,059, 85-89 years: 374) were ultimately eligible for the study. Of these, 2,450 (75-79 years: 1,238, 80-84 years: 861, 85-89 years: 351) died over the 15-year study period. Hazard ratios for death in frailty as determined by the t-KCL score were 1.337 (95% confidence interval [CI], 1.162-1.540) for the pre-frail group and 2.012 (95% CI, 1.7756-2.305) for the frail group at 75-79 years, respectively, compared with the robust group; 1.511 (95% CI, 1.271-1.797) at 80-84 years only in the frail group; and 1.567 (95% CI, 1.140-2.154) at 85-89 years, also in the frail group. DISCUSSION: The relationship between frailty and mortality weakens after age 80. The results suggest that factors other than frailty may have a stronger influence on mortality risk after the age of 80.

Frailty under COVID-19 pandemic in Japan: Changes in prevalence of frailty from 2017 to 2021.

BACKGROUND: After the outbreak of the coronavirus disease 2019 (COVID-19), "pandemic-associated-frailty" or profound health deterioration, in older adults has been considered a health concern. In this study, we sought to demonstrate whether pandemic-associated-frailty is occurring in Japan, where the population is aging, by showing the prevalence of frailty before and during the COVID-19 outbreak, using the same method. METHODS: A total of 5222 older adults in Otawara City, Tochigi Prefecture, aged 70 and 75 were surveyed annually using a complete survey, excluding those who were certified as requiring long-term care. Frailty during 2017-2019 before the COVID-19 outbreak and during 2020-2021 during the COVID-19 outbreak was determined using the Kihon Checklist (KCL). Statistical analysis was performed using the χ2 test to compare annual frailty status and Kruskal-Wallis test to compare the scores. RESULTS: The frailty statuses over the five-year period showed a significant decrease in Robust and a significant increase in Pre-frailty and Frailty (p < 0.001). Frailty increased markedly during the second year of the pandemic. Based on the category, the scores deteriorated significantly for activities of daily living (p < 0.001), physical function (p = 0.003), oral function (p < 0.001), outdoor activity (p < 0.001), and depression (p < 0.001). Moreover, there was a significant deterioration in the total score for 25 items (p < 0.001). In addition, a significant deterioration was observed in the total score of 23 items, excluding the social withdrawal affected by self-restraint life (p < 0.001). CONCLUSIONS: The population prevalence of frailty in older adults increased steadily from the pre-pandemic year through the first and second years of the pandemic. Based on the 25 questions of the KCL, two aspects including visiting friends and going out less stood out. This suggests that pandemic-associated-frailty occurred in Japan.

Characteristics of Japanese Older Adults Whose Trunk Muscle Mass Decreased during the COVID-19 Pandemic.

The coronavirus (COVID-19) pandemic significantly affected the physical and mental functions in older adults, resulting in "corona-frailty". This 2-year prospective study characterized changes in quantitative measures and corona-frailty among a cohort of community-dwelling older women. Changes were evaluated using face-to-face interactions with 39 Japanese women (mean age: 76.1 ± 5.9) in 2019 (pre-pandemic baseline) and 2021 (follow-up during the pandemic). Quantitative measurements of handgrip strength, walking speed, calf circumference, body composition, and background factors were evaluated. Body weight and trunk muscle mass significantly decreased at follow-up. Multiple regression analysis, using change in trunk muscle mass as the dependent variable and background factors as independent variables, identified that decrease in trunk muscle mass was associated with "being robust at baseline" and answering "Yes" to the question of "Do you go out less frequently compared with last year"? The 2-year trunk muscle mass change for each baseline frailty stage showed a significant decrease only in the robust group (-8.0%). The decrease in trunk muscle mass might be related to pandemic-induced lifestyle restraint, suggesting that robust older adults who are healthy and active should take measures that focus on trunk muscles to avoid "corona-frailty".

Kihon Checklist items associated with the development of frailty and recovery to robust status during the COVID-19 pandemic.

AIM: The Kihon Checklist (KCL) is used to assess frailty in daily life. We aimed to identify KCL items associated with the development of frailty and recovery to robust status during the COVID-19 pandemic. METHODS: We conducted a 1-year prospective cohort study of community-dwelling adults aged 70 and 75 years in Otawara City, Tochigi Prefecture, Japan. Information regarding age, sex, presence of disease and KCL items was collected in May 2020 (baseline) and June 2021 (follow-up) using a mailed questionnaire. Changes in frailty status as determined by the KCL at baseline and follow-up were evaluated. To clarify factors related to changes in the frailty status, we conducted two sets of binomial logistic regression analyses with the presence/absence of development of frailty and presence/absence of recovery to robust status at follow-up as the dependent variables and the KCL items as the independent variables. RESULTS: The analysis included 716 participants who provided complete responses to both questionnaires. The KCL Items 6, 10, 20, 23 and 24 were related to the development of frailty, and the KCL Items 6, 15, 21 and 23 were associated with the recovery to robust status. CONCLUSIONS: The baseline KCL items regarding physical function and associated mental aspects were related to both development of frailty and recovery to robust status during the COVID-19 pandemic. Cognitive and depressive declines were associated with the development of frailty, while good oral environment and sense of fulfillment in life were associated with the recovery to robust status. Geriatr Gerontol Int 2022; 22: 745-752.