BACKGROUND: Icaridin and DEET are common insect repellents widely used on human skin and clothing (skin-insect repellents [skin-IR]) to repel common pests, such as mosquitoes and biting flies. Novel analytical methods for urinary skin-IR exposure biomarkers that can be effectively applied in epidemiological studies and provide strong evidence related to risk assessment associated with daily exposure are required. In this study, we aimed to develop a method for analyzing the concentrations of icaridin, DEET, and two DEET metabolites N,N-diethyl-3-(hydroxymethyl) benzamide and 3-(diethylcarbamoyl) benzoic acid in human urine. METHODS: In this analysis, after formic acid-induced acidification of the urine sample, exposure biomarkers were extracted using solid-phase extraction composed of a modified polystyrenedivinylbenzene polymer for reversed phase (hydrophobic) retention. Subsequently, high-performance liquid chromatography-tandem mass spectrometry was performed within 10 min for a separation analysis. The present method was applied to five Japanese adults (aged 20-43 years) who used icaridin or DEET-containing products within a week. RESULTS: Limits of detection were 0.06-0.11 µg/L. Extraction recoveries were 74%-88%. The intraday and interday variations were 1.5-17.5 and 0.9-15.8% relative standard deviation, respectively. All exposure biomarkers were successfully detected in all five adults. Urinary concentrations of exposure biomarkers reached their maximum values within 15 h after starting to use skin-IR. CONCLUSIONS This method was successful in measuring urinary exposure biomarkers of skin-IR, including icaridin and DEET. Moreover, this study presents the first application of biomonitoring of urinary icaridin concentrations after using a commercial product.
Humans ; Solid Phase Extraction/methods* ; Tandem Mass Spectrometry/methods* ; Adult ; Insect Repellents/urine* ; DEET/urine* ; Young Adult ; Male ; Japan ; Female ; Chromatography, Liquid ; Biomarkers/urine* ; Chromatography, High Pressure Liquid ; East Asian People

BACKGROUND AND AIM: The association between physical activity (PA) and sarcopenia has mostly been investigated in older people, with few studies focused on earlier life stages. The present study aimed to determine whether higher PA levels are associated with a lower sarcopenia risk in middle-aged and early older people. METHODS: This was an 8-year follow-up study. Participants were 6,500 community-dwelling adults aged 40-74 years who participated in the baseline questionnaire survey conducted in 2011-2014 in Japan. Levels of total and leisure-time PAs at baseline were assessed using validated metabolic equivalent scores. Multi-frequency bioelectrical impedance analysis and handgrip strength measurement were performed in 2021-2022, and participants with low height-adjusted appendicular lean mass (<20th percentile) and low grip strength were diagnosed as having sarcopenia (outcome). Covariates were demographics, body size, lifestyle, and disease history at baseline. RESULTS: The prevalence of sarcopenia was 137/2926 (4.7%) for men and 127/3574 (3.6%) for women. Higher total PA levels were associated with lower odds of sarcopenia (P for trend = 0.0278), with the second highest group having a significantly lower OR (0.51) than the lowest group (reference) in women, but not in men. Regarding leisure-time PA, those engaged in leisure-time vigorous PA had a lower OR of sarcopenia than those who did not (OR = 0.67, P = 0.0625). CONCLUSION Higher levels of total PA are associated with a lower risk of sarcopenia in women but not in men, suggesting a sex difference in this association. In addition, high levels of vigorous leisure-time PA may be effective for preventing sarcopenia.
Humans ; Sarcopenia/epidemiology* ; Japan/epidemiology* ; Male ; Female ; Middle Aged ; Aged ; Follow-Up Studies ; Independent Living/statistics & numerical data* ; Exercise ; Adult ; Prevalence ; Risk Factors ; Hand Strength ; East Asian People

BACKGROUND: The demand for aged-care services in Japan has surged due to the country's aging population. Furthermore, nationwide survey on the current state of aged-care services revealed that the primary reason for the resignation of women working in these sectors was poor interpersonal relationships. Moreover, given that women working in aged-care services work in shifts around the clock to manage the health and safety of the people in their care, they are at high risk of health-related issues including insomnia symptoms. Thus, we aim to examine the association between levels of satisfaction with interpersonal relationships (LSIR) and insomnia symptoms for women working in aged-care services in Japan, as well as the effect of work-life imbalance on the association between LSIR and insomnia symptoms. METHODS: In this cross-sectional study, the participants were 472 women aged 18-60 years who worked in aged-care services in Japan in 2014-2016. Insomnia symptoms were measured using the Athens Insomnia Scale, and scores of 6 or greater indicated the presence of insomnia. LSIR were assessed through self-administered questionnaires and evaluated at three levels. The association between LSIR and insomnia symptoms was evaluated using a multinominal logistic regression model. Path analysis was used to examine the potential effects of LSIR on insomnia symptoms by incorporating covariates such as work-family conflict, marital status, and depressive symptoms. RESULTS: Compared to high LSIR, the multivariable-adjusted odds ratios (95% confidence interval) of insomnia symptoms were respectively 1.36 (0.81-2.30) and 2.42 (1.11-5.23) for medium and low LSIR. The path analysis showed that low LSIR were significantly associated with having high work-to-family (W-to-F) conflict and being single. CONCLUSIONS Low LSIR were significantly associated with insomnia symptoms among women working in aged-care services in Japan. High W-to-F conflict exacerbated this relationship. Therefore, enhancing interpersonal relationships may be necessary for preventing insomnia. However, due to the cross-sectional nature of our study, causality cannot be inferred. Further longitudinal research is needed to better understand these associations.
Humans ; Japan/epidemiology* ; Sleep Initiation and Maintenance Disorders/psychology* ; Female ; Middle Aged ; Adult ; Cross-Sectional Studies ; Interpersonal Relations ; Young Adult ; Adolescent ; Personal Satisfaction ; Health Services for the Aged/statistics & numerical data*

Background  The Kenya Medical Research Institute (KEMRI) is a national institution (state corporation of the Kenyan government) that conducts human health research in Kenya. The institute is important in the East African region. During the COVID-19 pandemic, KEMRI played a major role in conducting half of the PCR testing in Kenya.  In response to the excessive burden on researchers during the COVID-19 pandemic, to improve support to researchers, KEMRI decided to conduct internal training to develop skills in research management and administration (RMA) for mainly administrative staff, to strengthen collaboration between researchers and administrative staff.Planning, implementation, and evaluation of the RMA Training  From July 2023 to January 2024, in cooperation with Kyoto University and Japan International Cooperation Agency (JICA), a series of internal RMA training courses on the basic knowledge required for RMA staff was planned and conducted for the first time at KEMRI. As part of the training, Kyoto University’s practices were learned, and the “KEMRI RMA Process Mapping” workshop was held to make these processes easier to visualize for researchers by having the training participants compile the organization’s rules and regulations of KEMRI that were difficult to understand for researchers.   This paper describes KEMRI’s first internal RMA training in planning, implementation, and evaluation through group discussions.Conclusion  KEMRI conducted its first internal RMA training, which incorporated a combination of lectures and workshops. The training evaluation revealed that participants developed a more comprehensive understanding of the RMA-related work and enhanced their comprehension of the researchers’ work. The training participants began to utilize the learning of RMA-related specialized knowledge and organizational management related to the work for research support. The communication between RMA-related departments and between RMA staff and researchers was enhanced, and behavioral changes towards cross-departmental collaboration were observed. KEMRI is planning to revise its personnel and organizational regulations and strengthen internal training, including the RMA training.

Tokito is not only used to treat chest and abdominal pain caused by cold, but also acts as a qi-tonifying formula. In this report, we describe three cases of painless abdominal distention treated with tokito. Case 1 was a 53-year-old woman who complained of abdominal coldness and abdominal distension. Case 2 was a 48-year-old woman who complained of abdominal distention that had been bothering her for many years. Case 3 was a 57-year-old woman who complained of a stuffy chest and abdominal distention. All three patients experienced abdominal distention as well as coldness and easy fatigability. Therefore, we thought that the patients were suffering from abdominal distention due to depression unaccompanied by pain, and administered tokito to them. After one month of treatment with tokito, the abdominal distention was alleviated, and with continuous treatment, it improved in all cases. In addition to abdominal distention, the patients’ complaints of coldness and fatigability were also alleviated. Therefore, tokito may be effective in treating abdominal distention due to qi depression unaccompanied by pain.

This study aimed to explore, identify, and classify the strengths of elderly individuals living in rural areas from their own perspectives, using an asset-based approach. A qualitative analysis was conducted through group interviews. The study included two groups of four elderly individuals who resided in District D of Area C, City B, Prefecture A, and three groups of five to six elderly individuals from District E in the same city. As a result, 133 key items related to the strengths of elderly individuals were identified. These items were further classified into 39 subcategories, which were grouped into three major categories: individuals (personal strengths), associations (organizations/groups), and institutions (environments/resources that support strengths). Specifically, 18 subcategories were classified into the individuals category, 11 into the associations category, and 10 into the institutions category. These findings revealed that elderly individuals in rural areas actively take on various roles within their communities, utilizing their rural environment both as individuals and as part of a group. The rural setting itself was found to significantly influence their engagement, while intergenerational support and assistance from public institutions also played a crucial role. In the future, we aim to utilize these “strengths of elderly individuals” to develop strategies that empower community residents to lead vibrant, active, and secure lives in their familiar environments.

Objective: To clarify the progression of core flexibility and core muscle strength in fresh lumbar spondylolysis before and after the introduction of rehabilitation treatment. Methods: We enrolled 160 patients diagnosed with fresh lumbar spondylolysis based on magnetic resonance imaging findings from September 2019 to December 2022. Posterior Lumbar Flexibility test and Lumbar Locked Rotation test were performed to assess core flexibility. The Kraus-Weber test and Sahrmann Core Stability test were performed to assess core muscle strength. The initial and final evaluations of all tests were compared.Results: All tests showed significant improvement at the final evaluation compared to the initial evaluation.Conclusion: Patients with lumbar spondylolysis often had decreased core flexibility and core muscle strength at the initial evaluation; these parameters improved at the final evaluation owing to rehabilitation treatment.

Skeletal muscle fatigue is defined as muscle force depression following exercise or repeated contractions that mimic exercise. Oxidative stress, caused by excessive production of reactive oxygen species (ROS), has long been thought to contribute to muscle fatigue after acute exercise. However, recent studies on antioxidant treatments have suggested little impacts of oxidative stress on muscle fatigue. This review examines the chemical properties of various ROS, their source, their effects on the contractile mechanism, and their production during muscle fatigue. Based on these, this review discusses cellular mechanisms behind the limited ROS influence on muscle fatigue, with a focus on the primary ROS produced during exercise such as superoxide, hydrogen peroxide and hydroxyl radical. These ROS have been shown to exert both positive and negative effects on muscle force. Therefore, the limited effectiveness of antioxidants is thought to be due to their capacity to suppress not only the negative effects but also the positive effects of ROS. This antioxidant effect provides an important insight into the relationship between oxidative stress and muscle force. Previous studies suggest that the low levels of ROS can enhance muscle force, whereas higher levels impair it, which is referred to here as the “invert U” relationship. Developing this concept further, I proposed a hypothesis that the relationship between oxidative stress and muscle force can be divided into two phases: in phase 1, the positive and negative effects of ROS balance out, resulting in minimal impact on muscle force, while oxidative stress dramatically decreases force in phase 2 which occurs under more sever condition.

The Japan Primary Care Association (JPCA) and Royal College of General Practitioners (RCGP) exchange program aims to provide young family physicians with an international perspective and networking opportunities. The project was planned and presented at the 2024 JPCA and RCGP annual conferences, and site visits were conducted to enhance mutual understanding. The outcomes are summarized in this report.