Indoor lighting design for healthier workplaces: natural and electric light assessment for suitable circadian stimulus

Association between window ventilation frequency and depressive symptoms among older Chinese adults

OBJECTIVES

Indoor air pollution exposure is harmful to people's physical and mental health, especially in the elderly population. Depressive symptoms are the most common mental health issue among elderly individuals. However, evidence linking the frequency of indoor natural ventilation to depressive symptoms in the elderly population is limited.

METHODS

This study included 7887 individuals 65 years and older from 2017 to 2018 the China Longitudinal Healthy Longevity Survey (CLHLS). The frequency of indoor window ventilation was measured as the self-reported times of ventilation of indoor window per week in each season, and the four seasons' scores were added up to calculate the annual ventilation frequency. Depressive symptoms were measured by the 10-item Center for Epidemiologic Studies Short Depression Scale (CESD). Using three models adjusted for demographic, socio-economic, health status, and environmental factors successively, the correlation between indoor window ventilation frequency and depressive symptoms was verified through logistic regression.

RESULTS

Among the 7887 elderly people included in this study, 1952 (24.7 %) had depressive symptoms. In the fully adjusted model, compared with the lower indoor annual ventilation frequency group, high indoor annual ventilation frequency group was significantly associated with a 33 % (OR: 0.67, 95%CI: 0.51-0.88) lower probability of depressive symptoms. Subgroup analysis and sensitivity analysis yielded similar results.

CONCLUSIONS

High frequency of window ventilation is significantly associated with the lower risk of depressive symptoms in Chinese individuals aged 65 and older. This result provides strong evidence for health intervention and policy formulation.

A systematic literature review: building window's influence on indoor circadian health

Light has been shown to have a non-visual impact on the biological aspects of human health, particularly on circadian rhythms. Building windows are a potential means of regulating daylight conditions for circadian health and well-being. As a result of advancements in window and glazing technologies and variations in outdoor solar/sky conditions, understanding daylight's spectral characteristics, which pass through building window systems, is complex. Therefore, a systematic review and summary of the knowledge and evidence available regarding windows' impact on human circadian health is necessary. This study provides an overview of research in this domain, compares approaches and evaluation metrics, and underscores the importance of window parameters' influence on circadian health. Published studies available on various online databases since 2012 were evaluated. The findings of this study define a holistic approach to the melanopic performance of windows and provide an overview of current knowledge regarding the effect of windows on circadian health. Additionally, this work identifies future research directions based on the studies reviewed. This research contributes to the growing body of knowledge on the impact of windows on circadian health, which has implications for the design and construction of buildings in ways that support indoor human health and well-being from the circadian light adequacy perspective.

Sleep quality analysis of Chinese medical civilians in the Subtropics during different stages of deployment.. [DOI: 10.21203/rs.3.rs-2306219/v1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0]

Background: Inadequate sleep and poor sleep quality have been linked to higher incidences of major industrial and workplace accidents. They also have been associated with poorer health outcomes, such as increased risks of obesity, diabetes, cardiovascular disease, neurogenerative diseases, and poor mental health. Therefore, it is important to ensure adequate sleep and good sleep quality to promote the physical and mental wellbeing of individuals. The aim of this study was to analyze the sleep quality of medical civilians participating in a medical emergency rescue exercise, which involved travelling long distances on a train. Methods: We used the Pittsburgh Sleep Quality Index (PSQI) to measure the sleep duration and sleep quality during four different phases of the exercise, namely the training phase (T1), travel phase (T2), official task phase (T3), and quarantine phase (T4). Results: The mean sleep durations during each phase were 6.678 h (T1), 6.64 h (T2), 6.41 h (T3), and 7.06 h (T4), and the mean PSQI score of the sleep quality across all four phases was 4.43. The highest proportion of sleep disturbance occurred during the travel phase (c2=477; p<0.001). The nonmedical team members had a longer sleep duration and a better sleep quality compared to those of the medical team members (p<0.05). Conclusion: Our study demonstrated that medical civilians experience a shorter sleep duration and a poorer sleep quality during deployment. Interventions such as lowering acute stress levels and workload, promoting good sleep hygiene and attitudes towards sleep, and improving the sleep environment may help to improve the overall sleep quality of medical team members.

Academic library spaces and student activities during the COVID-19 pandemic

A library in higher education plays a primary role in students' learning on campus. In addition to individually-focused studying, students come to a library for various purposes, such as group learning, collaborating, and socializing. To support students' different types of learning, appropriate physical and functional environments of the spaces must be provided. However, the environmental effects of learning spaces have not been explored extensively. Additionally, the COVID-19 pandemic has forced students to remain and study at home for extended periods, and it is expected that the pandemic experience has affected students' space use patterns. This study aims to examine the effect of the pandemic on students' library usage and to investigate the necessary environments to effectively support students' learning activities. Data was collected via interviews with 12 students. One of the main findings is that, even though students used the library less during the pandemic, they expected to use it as much as pre-pandemic or even more after the pandemic. Furthermore, both physical and functional environments were associated with the study performance and wellbeing of the students. Therefore, understanding students' learning activities and preferred environments in a library is critical to providing appropriate spaces supporting students' learning performance and wellbeing.

Chrono-communication and cardiometabolic health: The intrinsic relationship and therapeutic nutritional promises

Circadian rhythm, an innate 24-h biological clock, regulates several mammalian physiological activities anticipating daily environmental variations and optimizing available energetic resources. The circadian machinery is a complex neuronal and endocrinological network primarily organized into a central clock, suprachiasmatic nucleus (SCN), and peripheral clocks. Several small molecules generate daily circadian fluctuations ensuring inter-organ communication and coordination between external stimuli, i.e., light, food, and exercise, and body metabolism. As an orchestra, this complex network can be out of tone. Circadian disruption is often associated with obesity development and, above all, with diabetes and cardiovascular disease onset. Moreover, accumulating data highlight a bidirectional relationship between circadian misalignment and cardiometabolic disease severity. Food intake abnormalities, especially timing and composition of meal, are crucial cause of circadian disruption, but evidence from preclinical and clinical studies has shown that food could represent a unique therapeutic approach to promote circadian resynchronization. In this review, we briefly summarize the structure of circadian system and discuss the role playing by different molecules [from leptin to ghrelin, incretins, fibroblast growth factor 21 (FGF-21), growth differentiation factor 15 (GDF15)] to guarantee circadian homeostasis. Based on the recent data, we discuss the innovative nutritional interventions aimed at circadian re-synchronization and, consequently, improvement of cardiometabolic health.