1
|
Baniassadi A, Manor B, Yu W, Travison T, Lipsitz L. Nighttime ambient temperature and sleep in community-dwelling older adults. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 899:165623. [PMID: 37474050 PMCID: PMC10529213 DOI: 10.1016/j.scitotenv.2023.165623] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Revised: 07/14/2023] [Accepted: 07/16/2023] [Indexed: 07/22/2023]
Abstract
This longitudinal study examines the association between bedroom nighttime temperature and sleep quality in a sample of community dwelling older adults. Using wearable sleep monitors and environmental sensors, we assessed sleep duration, efficiency, and restlessness over an extended period within participants' homes while controlling for potential confounders and covariates. Our findings demonstrated that sleep was most efficient and restful when nighttime ambient temperature ranged between 20 and 25 °C, with a clinically relevant 5-10 % drop in sleep efficiency when the temperature increased from 25 °C to 30 °C. The associations were primarily nonlinear, and substantial between-subject variations were observed. These results highlight the potential to enhance sleep quality in older adults by optimizing home thermal environments and emphasize the importance of personalized temperature adjustments based on individual needs and circumstances. Additionally, our study underscores the potential impact of climate change on sleep quality in older adults, particularly those with lower socioeconomic status, and supports increasing their adaptive capacity in the face of a changing climate.
Collapse
Affiliation(s)
- Amir Baniassadi
- Marcus Institute for Aging Research, Boston, MA, USA; Harvard Medical School, Boston, MA, USA.
| | - Brad Manor
- Marcus Institute for Aging Research, Boston, MA, USA; Harvard Medical School, Boston, MA, USA
| | - Wanting Yu
- Marcus Institute for Aging Research, Boston, MA, USA
| | - Thomas Travison
- Marcus Institute for Aging Research, Boston, MA, USA; Harvard Medical School, Boston, MA, USA
| | - Lewis Lipsitz
- Marcus Institute for Aging Research, Boston, MA, USA; Harvard Medical School, Boston, MA, USA
| |
Collapse
|
2
|
Fan X, Liao C, Matsuo K, Verniers K, Laverge J, Neyrinck B, Pollet I, Fang L, Lan L, Sekhar C, Wargocki P. A single-blind field intervention study of whether increased bedroom ventilation improves sleep quality. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 884:163805. [PMID: 37142023 DOI: 10.1016/j.scitotenv.2023.163805] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2023] [Revised: 04/24/2023] [Accepted: 04/24/2023] [Indexed: 05/06/2023]
Abstract
A four-week-long field intervention experiment was conducted in twenty-nine bedrooms with extract ventilation systems and air inlet vents. During the first week no interventions took place. In the three weeks that followed, each participant slept for one week under a low, medium, and high ventilation rate condition in a balanced order. These conditions were established by covertly altering the fan speed of the exhaust ventilation system without changing other settings. Participants were not informed when or even whether the changes to bedroom ventilation would be executed. The bedroom environmental quality was monitored continuously and sleep quality was monitored using wrist-worn trackers. Tests of cognitive performance were conducted in the evening and morning. In twelve bedrooms where clear differences between the three ventilation conditions occurred, as indicated by the measured CO2 concentrations, participants had significantly less deep sleep, more light sleep and more awakenings at lower ventilation rate conditions. In twenty-three bedrooms where a clear difference in ventilation rate between the high and low ventilation conditions was observed, as confirmed by the measured CO2 concentrations, the duration of deep sleep was significantly shorter in the low ventilation rate condition. No differences in cognitive performance between conditions were observed. At lower ventilation rate conditions, the concentrations of CO2 increased, as did the relative humidity, while bedroom temperatures remained unchanged. The present results, which were obtained in actual bedrooms, confirm the findings in previous studies of a positive effect of increased ventilation on sleep quality. Further studies with larger populations and better control of bedroom conditions, particularly ventilation, are required.
Collapse
Affiliation(s)
- Xiaojun Fan
- International Centre for Indoor Environment and Energy, Department of Environmental and Resource Engineering, Technical University of Denmark, Denmark.
| | - Chenxi Liao
- Research Group of Building Physics, Construction, and Climate Control, Department of Architecture and Urban Planning, Ghent University, Belgium
| | - Kazuya Matsuo
- International Centre for Indoor Environment and Energy, Department of Environmental and Resource Engineering, Technical University of Denmark, Denmark; Department of Architecture, Waseda University, Japan
| | | | - Jelle Laverge
- Research Group of Building Physics, Construction, and Climate Control, Department of Architecture and Urban Planning, Ghent University, Belgium
| | | | - Ivan Pollet
- R&D Department Renson Ventilation NV, Waregem, Belgium
| | - Lei Fang
- International Centre for Indoor Environment and Energy, Department of Environmental and Resource Engineering, Technical University of Denmark, Denmark
| | - Li Lan
- Department of Architecture, School of Design, Shanghai Jiao Tong University, China
| | - Chandra Sekhar
- Department of the Built Environment, National University of Singapore, Singapore
| | - Pawel Wargocki
- International Centre for Indoor Environment and Energy, Department of Environmental and Resource Engineering, Technical University of Denmark, Denmark
| |
Collapse
|
3
|
Bozigar M, Huang T, Redline S, Hart JE, Grady ST, Nguyen DD, James P, Nicholas B, Levy JI, Laden F, Peters JL. Associations between Aircraft Noise Exposure and Self-Reported Sleep Duration and Quality in the United States-Based Prospective Nurses' Health Study Cohort. ENVIRONMENTAL HEALTH PERSPECTIVES 2023; 131:47010. [PMID: 37058435 PMCID: PMC10104165 DOI: 10.1289/ehp10959] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Revised: 02/21/2023] [Accepted: 03/03/2023] [Indexed: 06/19/2023]
Abstract
BACKGROUND Sleep disruption is linked with chronic disease, and aircraft noise can disrupt sleep. However, there are few investigations of aircraft noise and sleep in large cohorts. OBJECTIVES We examined associations between aircraft noise and self-reported sleep duration and quality in the Nurses' Health Study, a large prospective cohort. METHODS Aircraft nighttime equivalent sound levels (Lnight) and day-night average sound levels (DNL) were modeled around 90 U.S. airports from 1995 to 2015 in 5-y intervals using the Aviation Environmental Design Tool and linked to geocoded participant residential addresses. Lnight exposure was dichotomized at the lowest modeled level of 45 A-weighted decibels [dB(A)] and at multiple cut points for DNL. Multiple categories of both metrics were compared with < 45 dB(A). Self-reported short sleep duration (< 7 h/24-h day) was ascertained in 2000, 2002, 2008, 2012, and 2014, and poor sleep quality (frequent trouble falling/staying asleep) was ascertained in 2000. We analyzed repeated sleep duration measures using generalized estimating equations and sleep quality by conditional logistic regression. We adjusted for participant-level demographics, behaviors, comorbidities, and environmental exposures (greenness and light at night) and examined effect modification. RESULTS In 35,226 female nurses averaging 66.1 years of age at baseline, prevalence of short sleep duration and poor sleep quality were 29.6% and 13.1%, respectively. In multivariable models, exposure to Lnight ≥ 45 dB(A) was associated with 23% [95% confidence interval (CI): 7%, 40%] greater odds of short sleep duration but was not associated with poor sleep quality (9% lower odds; 95% CI: - 30 % , 19%). Increasing categories of Lnight and DNL ≥ 45 dB(A) suggested an exposure-response relationship for short sleep duration. We observed higher magnitude associations among participants living in the West, near major cargo airports, and near water-adjacent airports and among those reporting no hearing loss. DISCUSSION Aircraft noise was associated with short sleep duration in female nurses, modified by individual and airport characteristics. https://doi.org/10.1289/EHP10959.
Collapse
Affiliation(s)
- Matthew Bozigar
- Department of Environmental Health, Boston University School of Public Health, Boston, Massachusetts, USA
| | - Tianyi Huang
- Channing Division of Network Medicine, Department of Medicine, Brigham and Women’s Hospital and Harvard Medical School, Boston, Massachusetts, USA
| | - Susan Redline
- Channing Division of Network Medicine, Department of Medicine, Brigham and Women’s Hospital and Harvard Medical School, Boston, Massachusetts, USA
- Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA
- Beth Israel Deaconess Medical Center, Boston, Massachusetts, USA
| | - Jaime E. Hart
- Channing Division of Network Medicine, Department of Medicine, Brigham and Women’s Hospital and Harvard Medical School, Boston, Massachusetts, USA
- Department of Environmental Health, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA
| | - Stephanie T. Grady
- Department of Environmental Health, Boston University School of Public Health, Boston, Massachusetts, USA
| | - Daniel D. Nguyen
- Department of Environmental Health, Boston University School of Public Health, Boston, Massachusetts, USA
| | - Peter James
- Department of Environmental Health, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA
- Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, Massachusetts, USA
| | - Bradley Nicholas
- Volpe National Transportation Systems Center, U.S. Department of Transportation, Cambridge, Massachusetts, USA
| | - Jonathan I. Levy
- Department of Environmental Health, Boston University School of Public Health, Boston, Massachusetts, USA
| | - Francine Laden
- Channing Division of Network Medicine, Department of Medicine, Brigham and Women’s Hospital and Harvard Medical School, Boston, Massachusetts, USA
- Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA
- Department of Environmental Health, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA
| | - Junenette L. Peters
- Department of Environmental Health, Boston University School of Public Health, Boston, Massachusetts, USA
| |
Collapse
|
4
|
Zhang F, Shi L, Liu S, Shi J, Cheng M, Xiang T. The Ancient Town Residential Environment of the Elderly in Xiangxi Tujia: Survey, Questions, and Recommendations. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:10820. [PMID: 36078529 PMCID: PMC9518449 DOI: 10.3390/ijerph191710820] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/24/2022] [Revised: 08/21/2022] [Accepted: 08/28/2022] [Indexed: 06/15/2023]
Abstract
This study uses behavioral observation, interviews, and questionnaire research to investigate the residential environment. It also evaluates the elderly in four representative ancient towns of Xiangxi, namely, Liye Ancient Town, Furong Ancient Town, Liexi Ancient Town, and Xichehe Ancient Town. It includes indoor air (CO2, PM2.5, PM10) and light intensity monitoring for the residential environment. The results showed that the elderly had a significant sense of frustration and loneliness. Of the elderyly, 70% believed the current living environment had an impact on healthy living, and 45% believed the safety and convenience of the living environment should be improved. More than 80% of the elderly were dissatisfied with their indoor acoustic environment, and more than 70% were dissatisfied with their home transportation. More than 85% of the elderly considered traditional wooden components and spaces to be the source of cultural identity. Furthermore, the average indoor PM2.5 concentration during the fire pit fire was 350-600 µg/m3, about 4.7-8 times the Chinese standard value. The average concentration of PM10 in all rooms was more than 400 µg/m3, approximately three times the Chinese standard value. Also, targeted environmental improvement strategies were proposed. The study results provided actual information to develop a systematic approach and a targeted design based on the needs to improve the residential environment of the elderly in ancient cities.
Collapse
Affiliation(s)
- Fupeng Zhang
- School of Architecture and Art, Central South University, Changsha 410075, China
- Health Building Research Center, Central South University, Changsha 410075, China
| | - Lei Shi
- School of Architecture and Art, Central South University, Changsha 410075, China
- Health Building Research Center, Central South University, Changsha 410075, China
| | - Simian Liu
- School of Architecture and Art, Central South University, Changsha 410075, China
- Health Building Research Center, Central South University, Changsha 410075, China
| | - Jiaqi Shi
- School of Architecture and Art, Central South University, Changsha 410075, China
- Health Building Research Center, Central South University, Changsha 410075, China
- College of Architecture, Changsha University of Science & Technology, Changsha 410114, China
| | - Mengfei Cheng
- School of Architecture and Art, Central South University, Changsha 410075, China
- Health Building Research Center, Central South University, Changsha 410075, China
| | - Tansheng Xiang
- School of Architecture and Art, Central South University, Changsha 410075, China
- Health Building Research Center, Central South University, Changsha 410075, China
| |
Collapse
|
5
|
Zhang F, Shi L, Liu S, Shi J, Cheng M. Indoor Air Quality in Tujia Dwellings in Hunan, China: Field Tests, Numerical Simulations, and Mitigation Strategies. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:ijerph19148396. [PMID: 35886247 PMCID: PMC9325221 DOI: 10.3390/ijerph19148396] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/12/2022] [Revised: 06/30/2022] [Accepted: 07/07/2022] [Indexed: 12/21/2022]
Abstract
Air pollution is a major health hazard. The traditional habits and unique ethnic fire culture in Hunan Tujia region result in the long-term exposure of residents, especially elderly people, to pollutants. In this study, we conducted field monitoring and assessment of indoor pollutants in the residential houses of Hunan Tujia families and subsequently visualised and simulated fire pollutants in representative residential houses by using fire-dynamic-simulator software. Pollutant-control strategies, using passive smoke collectors and resizing windows, were proposed and simulated for validation. The results revealed that passive smoke collectors reduced the pollutant concentration in the hall house by 43.96%. Furthermore, the optimal window size was 1500 mm × 1500 mm, and the most reasonable windowsill height of the firepit was 1800 mm. The results of the study can be used to improve the indoor air quality of Tujia dwellings and mitigate the adverse health effects of exposure to indoor air pollution without restricting ethnic beliefs and traditional customs.
Collapse
Affiliation(s)
- Fupeng Zhang
- School of Architecture and Art, Central South University, Changsha 410075, China; (F.Z.); (L.S.); (M.C.)
- Health Building Research Center, Central South University, Changsha 410075, China
| | - Lei Shi
- School of Architecture and Art, Central South University, Changsha 410075, China; (F.Z.); (L.S.); (M.C.)
- Health Building Research Center, Central South University, Changsha 410075, China
| | - Simian Liu
- School of Architecture and Art, Central South University, Changsha 410075, China; (F.Z.); (L.S.); (M.C.)
- Health Building Research Center, Central South University, Changsha 410075, China
- Correspondence: (S.L.); (J.S.)
| | - Jiaqi Shi
- School of Architecture and Art, Central South University, Changsha 410075, China; (F.Z.); (L.S.); (M.C.)
- Health Building Research Center, Central South University, Changsha 410075, China
- College of Architecture, Changsha University of Science & Technology, Changsha 410114, China
- Correspondence: (S.L.); (J.S.)
| | - Mengfei Cheng
- School of Architecture and Art, Central South University, Changsha 410075, China; (F.Z.); (L.S.); (M.C.)
- Health Building Research Center, Central South University, Changsha 410075, China
| |
Collapse
|
6
|
Fan X, Sakamoto M, Shao H, Kuga K, Ito K, Lan L, Wargocki P. Emission rate of carbon dioxide while sleeping. INDOOR AIR 2021; 31:2142-2157. [PMID: 34337798 DOI: 10.1111/ina.12911] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2021] [Revised: 06/08/2021] [Accepted: 07/11/2021] [Indexed: 06/13/2023]
Abstract
Humans emit carbon dioxide (CO2 ) as a product of their metabolism. Its concentration in buildings is used as a marker of ventilation rate (VR) and degree of mixing of supply air, and indoor air quality (IAQ). The CO2 emission rate (CER) may be used to estimate the ventilation rate. Many studies have measured CERs from subjects who were awake but little data are available from sleeping subjects and the present publication was intended to reduce this gap in knowledge. Seven females (29 ± 5 years old; BMI: 22.2 ± 0.8 kg/m2 ) and four males (27 ± 1 years old; BMI: 20.5 ± 1.5 kg/m2 ) slept for four consecutive nights in a specially constructed capsule at two temperatures (24 and 28°C) and two VRs that maintained CO2 levels at ca. 800 ppm and 1700 ppm simulating sleeping conditions reported in the literature. The order of exposure was balanced, and the first night was for adaptation. Their physiological responses, including heart rate, pNN50, core body temperature, and skin temperature, were measured as well as sleep quality, and subjective responses were collected each evening and morning. Measured steady-state CO2 concentrations during sleep were used to estimate CERs with a mass-balance equation. The average CER was 11.0 ± 1.4 L/h per person and was 8% higher for males than for females (P < 0.05). Increasing the temperature or decreasing IAQ by decreasing VR had no effects on measured CERs and caused no observable differences in physiological responses. We also calculated CERs for sleeping subjects using the published data on sleep energy expenditure (SEE) and Respiratory Quotient (RQ), and our measured CERs confirmed both these calculations and the CERs predicted using the equations provided by ASHRAE Standard 62.1, ASHRAE Handbook, and ASTM D6245-18. The present results provide a valuable and helpful reference for the design and control of bedroom ventilation but require confirmation and extension to other age groups and populations.
Collapse
Affiliation(s)
- Xiaojun Fan
- International Centre for Indoor Environment and Energy, Technical University of Denmark, Lyngby, Denmark
| | - Mitsuharu Sakamoto
- Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Fukuoka, Japan
| | - Huiqi Shao
- School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing, China
| | - Kazuki Kuga
- Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Fukuoka, Japan
| | - Kazuhide Ito
- Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Fukuoka, Japan
| | - Li Lan
- Department of Architecture, School of Design, Shanghai Jiao Tong University, Shanghai, China
| | - Pawel Wargocki
- International Centre for Indoor Environment and Energy, Technical University of Denmark, Lyngby, Denmark
| |
Collapse
|