The Relationship Between Social Interaction and Anxiety Regarding COVID-19 in Japanese Older Adults

While previous studies suggest that women have higher anxiety than men regarding COVID-19, underlying mechanisms remain unclear. This study tries to explain the mechanisms by gender difference in social interaction based on a theory of social amplification of risk framework (SARF). We surveyed older adults in Japan regarding their anxiety regarding COVID-19, as well as the frequencies of their direct and indirect social interaction in July 2020 ( N  = 1,587, aged 78–99 years). To explore the way in which gender and anxiety regarding COVID-19 were mediated by these two types of social interactions, MODEL4 of SPSS’s Process MACRO was applied to the data. We found that older women interacted more directly and indirectly with others than did older men. And, direct social interaction was negatively and related, but indirect social interaction was positively related to older adults’ anxiety regarding COVID-19. Furthermore, direct social interaction was related to older women’s low anxiety regarding COVID-19, whereas indirect social interaction was related to older women’s high anxiety regarding COVID-19. The findings of our study suggest that the degree of anxiety regarding COVID-19 among older women may be dependent upon the types of social interaction they have with others

Factors Related to Preventive Behaviors against a Decline in Physical Fitness among Community-Dwelling Older Adults during the COVID-19 Pandemic: A Qualitative Study

Older adults face the concern of developing frailty and sarcopenia due to an inactive lifestyle during the coronavirus disease 2019 (COVID-19) pandemic. This study aimed to reveal the preventive behaviors taken by older adults who perceived a decline in physical fitness during COVID-19 and analyze the background factors which promoted such behaviors using a qualitative study design in 2020. The participants were recruited through the cohort study of Japanese older adults who were aged 79–81 and had not been diagnosed with sarcopenia previously in 2019 and perceived their physical fitness to have declined during the pandemic. The interviews of 19 participants were analyzed using thematic analysis. The participants engaged in five types of preventive behaviors to counter declining physical fitness: “walking”, “exercising at home”, “improving daily diet”, “maintaining a daily routine”, and “taking a good rest”. Four themes were extracted pertaining to backgrounds of such preventive behaviors: “feeling anxiety and mental pressure”, “available networks with family and neighbors”, “prior experiences of behaviors”, and “access to information”. Anxiety due to lifestyle changes during the pandemic was the primary reason for the behaviors. This study can be a useful guide for undertaking possible measures to prevent frailty during future pandemics

Homologous expression and characterization of gassericin T and gassericin S, a novel class IIb bacteriocin produced by LA327

Lactobacillus gasseri LA327 isolated from the large intestine tissue in humans is a bacteriocinogenic strain with two kinds of class IIb bacteriocin structural genes, i.e. gassericin T (GT) and acidocin LF221A (Acd LF221A). In this study, DNA sequencing of the genes for GT and Acd LF221A from Lb. gasseri LA327 revealed that the amino acid sequences for GT corresponded with those of GT genes, except for GatK (histidine kinase). However, Acd LF221A genes had analogues which differed in at least one amino acid residue to be a class IIb bacteriocin designated as gassericin S (GS). The LA327 strain retained antimicrobial activity after the deletion of the GT structural genes (gatAX), however both GS and GT activities were lost by deletion of the putative ABC transporter gene (gatT). This indicates that the LA327 strain produces GS and GT, and that GS secretion is performed via GT genes with the inclusion of gatT Homologous expression using deletion mutants for GS and GT, each containing a single peptide, elucidated that GS (GasAX) and GT (GatAX) showed synergistic activity as class IIb bacteriocins, respectively, and that no synergistic activity was observed between GS and GT peptides. The molecular mass of GS was estimated to be theoretical ca. 5,400 Da by in situ activity assay after SDS-PAGE, clarifying that GS was actually expressed as an active class IIb bacteriocin. Furthermore, stability of GS expressed for pH, heat and protease was determined.ImportanceBacteriocins are regarded as potential alternatives for antibiotics in the absence of highly resistant bacteria. In particular, two-peptide (class IIb) bacteriocins exhibit the maximum activity through the synergy of two components, and its antimicrobial spectrum is known to be relatively wide. However, there are few reports of synergistic activity of class IIb bacteriocins by isolation and purification of individual peptides. Our results clarified the interaction of each class IIb component peptide for GT and GS via the construction of homologous mutants, which were not dependent on the purification. These data may contribute to understanding the action mechanisms for class IIb bacteriocins to exhibit the wide antibacterial spectra

Longitudinal association of hypertension and dyslipidemia with cognitive function in community-dwelling older adults: the SONIC study.

The associations among cognitive function, hypertension, and dyslipidemia in older adults are controversial. Therefore, we investigated the associations among cognitive decline, hypertension, dyslipidemia, and their combination in community-dwelling older people in their 70s, 80s, and 90s in the long-term observational Septuagenarians, Octogenarians, Nonagenarians, Investigation with Centenarians (SONIC) study. We administered the Montreal Cognitive Assessment Japanese version (MoCA-J) by trained geriatricians and psychologists, and conducted blood testing and blood pressure (BP) measuring by medical staff involving 1186 participants. We performed multiple regression analysis to assess the relationships among hypertension, dyslipidemia, their combination, and lipid and BP levels with cognitive function at the 3-year follow-up after adjusting for covariate factors. At the baseline, the percentage of the combination of hypertension and dyslipidemia was 46.6% (n = 553), hypertension was 25.6% (n = 304), dyslipidemia was 15.0% (n = 178), and that without hypertension or dyslipidemia was 12.7% (n = 151). Conducting multiple regression analysis, no significant correlation was found between the combination of hypertension and dyslipidemia and MoCA-J score. In the group with the combination, high high-density lipoprotein cholesterol (HDL) levels resulted in higher MoCA-J scores at the follow-up (β = 0.06; P < 0.05) and high diastolic BP (DBP) also resulted in higher MoCA-J scores (β = 0.08; P < 0.05). The results suggest that high HDL and DBP levels of individuals with HT & DL and high SBP levels of individuals with HT were associated with cognitive function in community-dwelling older adults. In the SONIC study, which is an epidemiological study of Japanese older persons aged 70 years or older, a disease-specific examination suggested that high HDL and DBP levels of individuals with hypertension & dyslipidemia and high SBP levels of individuals with hypertension were associated with maintaining cognitive function in community-dwelling older adults

Associations among anxiety, risk perception, preventive behaviors, and personality in Japanese older adults aged 78 to 99 years during the COVID-19 pandemic

Background and Objectives: To deepen the understanding of processes underlying older adults’ behavior during the COVID-19 pandemic, we investigated associations among affective (anxiety about the coronavirus), cognitive (perceived risk of infection and fatality), and behavioral (engagement in preventive behaviors) variables. We also examined how these variables were predicted by personality traits measured before the pandemic. Research Design and Methods: Older adults (N = 1,727; 78–99 years old) were recruited from an ongoing longitudinal cohort study started in 2010. They responded to a questionnaire sent in August 2020, which included four items measuring COVID-19 anxiety, infection risk perception, fatality risk perception, and engagement in preventive behaviors. Big Five personality traits were measured years ago when the participants had first participated in the study. Results: Most participants felt anxious, engaged in preventive behaviors, and overestimated infection and fatality risks. Older age was associated with low anxiety, a low perception of infection risk, a high perception of fatality risk, and a little engagement in preventive behaviors. Women were more susceptible to the pandemic than men were, demonstrated by higher scores on all four items. Partial correlation analysis controlling for age and sex demonstrated positive associations among all four items except for infection risk perception and preventive behaviors. Anxiety and perceived infection risk were positively predicted by neuroticism and conscientiousness, respectively. Engagement in preventive behaviors was positively predicted by extraversion, openness to experience, and conscientiousness. Discussion and Implications: We highlighted the critical distinction between infection and fatality risk perceptions and demonstrated the need to consider each individual’s attributes