scholarly journals Physiological responses, self‐reported health effects, and cognitive performance during exposure to carbon dioxide at 20 000 ppm

Indoor Air ◽  
2021 ◽  
Author(s):  
Janin Maniscalco ◽  
Frank Hoffmeyer ◽  
Christian Monsé ◽  
Birger Jettkant ◽  
Eike Marek ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Health Effects ◽  
Cognitive Performance ◽  
Physiological Responses ◽  
Reported Health

scholarly journals Low Level Carbon Dioxide Indoors—A Pollution Indicator or a Pollutant? A Health-Based Perspective

Environments ◽  
2021 ◽  
Vol 8 (11) ◽  
pp. 125
Author(s):  
Scott D. Lowther ◽  
Sani Dimitroulopoulou ◽  
Kerry Foxall ◽  
Clive Shrubsole ◽  
Emily Cheek ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Health Outcomes ◽  
Health Effects ◽  
Developed Countries ◽  
Indoor Environments ◽  
Low Level ◽  
Co2 Concentrations ◽  
Pollution Indicator ◽  
Reported Health ◽  
Study Designs

With modern populations in developed countries spending approximately 90% of their time indoors, and with carbon dioxide (CO2) concentrations inside being able to accumulate to much greater concentrations than outdoors, it is important to identify the health effects associated with the exposure to low-level CO2 concentrations (<5000 ppm) typically seen in indoor environments in buildings (non-industrial environments). Although other reviews have summarised the effects of CO2 exposure on health, none have considered the individual study designs of investigations and factored that into the level of confidence with which CO2 and health effects can be associated, nor commented on how the reported health effects of exposure correspond to existing guideline concentrations. This investigation aimed to (a) evaluate the reported health effects and physiological responses associated with exposure to less than 5000 parts per million (ppm) of CO2 and (b) to assess the CO2 guideline and limit concentrations in the context of (a). Of the 51 human investigations assessed, many did not account for confounding factors, the prior health of participants or cross-over effects. Although there is some evidence linking CO2 exposures with health outcomes, such as reductions in cognitive performance or sick building syndrome (SBS) symptoms, much of the evidence is conflicting. Therefore, given the shortcomings in study designs and conflicting results, it is difficult to say with confidence whether low-level CO2 exposures indoors can be linked to health outcomes. To improve the epidemiological value of future investigations linking CO2 with health, studies should aim to control or measure confounding variables, collect comprehensive accounts of participants’ prior health and avoid cross-over effects. Although it is difficult to link CO2 itself with health effects at exposures less than 5000 ppm, the existing guideline concentrations (usually reported for 8 h, for schools and offices), which suggest that CO2 levels <1000 ppm represent good indoor air quality and <1500 ppm are acceptable for the general population, appear consistent with the current research.

scholarly journals Evaluation of the human cognitive performance and physiological responses in different thermal situations; a simulated study in controlled climatic room

2021 ◽  
Vol 1 (1) ◽  
pp. 1
Author(s):  
Matin Roshan ◽  
Zahra Jafari ◽  
Abolfazl Mohammadbeigi ◽  
Ahmad Soltanzadeh ◽  
Mohsen Mahdinia ◽  
...  
Keyword(s):  
Cognitive Performance ◽  
Physiological Responses

Physiological Responses to Elevated Carbon Dioxide Levels in Buildings

1997 ◽  
Vol 6 (5) ◽  
pp. 301-308 ◽  
Author(s):  
Saul Stricker ◽  
Marc Bourgeau ◽  
Eric Fonberg ◽  
Denis Parent
Keyword(s):  
Carbon Dioxide ◽  
Physiological Responses ◽  
Elevated Carbon Dioxide ◽  
Carbon Dioxide Levels

scholarly journals The role of carbon dioxide in nematode behaviour and physiology

Parasitology ◽  
2019 ◽  
Vol 147 (8) ◽  
pp. 841-854 ◽  
Author(s):  
Navonil Banerjee ◽  
Elissa A. Hallem
Keyword(s):  
Carbon Dioxide ◽  
Neural Circuit ◽  
Physiological Responses ◽  
Life Stage ◽  
Free Living ◽  
Behavioural Responses ◽  
Wide Range ◽  
Sensory Cue ◽  
Context Dependent

AbstractCarbon dioxide (CO2) is an important sensory cue for many animals, including both parasitic and free-living nematodes. Many nematodes show context-dependent, experience-dependent and/or life-stage-dependent behavioural responses to CO2, suggesting that CO2 plays crucial roles throughout the nematode life cycle in multiple ethological contexts. Nematodes also show a wide range of physiological responses to CO2. Here, we review the diverse responses of parasitic and free-living nematodes to CO2. We also discuss the molecular, cellular and neural circuit mechanisms that mediate CO2 detection in nematodes, and that drive context-dependent and experience-dependent responses of nematodes to CO2.

Exploring soundscaping options for the cognitive environment in an open-plan office

2020 ◽  
Vol 27 (3) ◽  
pp. 185-202
Author(s):  
Young Lee ◽  
Elizabeth C Nelson ◽  
Mark J Flynn ◽  
Joshua S Jackman
Keyword(s):  
White Noise ◽  
Cognitive Performance ◽  
Acoustic Noise ◽  
Electrodermal Activity ◽  
Physiological Responses ◽  
Wearable Devices ◽  
Open Plan ◽  
Cognitive Environment ◽  
Performance Satisfaction ◽  
Acoustic Variation

A major source of noise complaints in open-plan offices has consistently been co-workers talking nearby or talking on the phone. Various masking sounds such as white noise and pink noise have been explored to reduce the intelligibility level of speech from adjacent co-workers in open-plan offices. Recently, nature soundscapes such as water, rainfall or birdsong have been introduced instead of conventional white or pink noises. Water sounds with limited acoustic variation have shown more effectiveness than nature sounds with high acoustic variation such as birdsong. This study examined four types of background sounds in a controlled lab environment that simulated a typical open-plan office in a large pharmaceutical company in the United Kingdom. The purpose was to understand cognitive performance, satisfaction and preference, and physiological responses among the four types of background sounds: no external acoustic noise, typical daily office noise, white noise and spring water sound. The study employed three methods: an assessment of cognitive performance to measure memory, distractibility and decision-making; a survey to understand subjective satisfaction and preference; and use of wearable devices to monitor physiological responses. Two different types of wearable devices were used: pulse oximeter and electrodermal activity sensor to compare physiological responses to the four types of sounds. This article discusses discrepancies found between participants’ satisfaction/preference and their cognitive performance under the four background sounds and potential future implications of masking sounds in open-plan offices.

Behavioral and Physiological Responses to Nicotine Patch Administration Among Nonsmokers Based on Acute and Chronic Secondhand Tobacco Smoke Exposure

2015 ◽  
Vol 18 (1) ◽  
pp. 60-67
Author(s):  
Chizimuzo Okoli ◽  
Jonathan Kodet ◽  
Heather Robertson
Keyword(s):  
Behavioral Health ◽  
Health Effects ◽  
Tobacco Smoke ◽  
Nicotine Patch ◽  
Physiological Responses ◽  
Tobacco Smoke Exposure ◽  
Nicotine Administration ◽  
Secondhand Tobacco Smoke ◽  
Shs Exposure ◽  
Time Point

Introduction: Despite the large amount that is known about the physical health effects of secondhand tobacco smoke (SHS) exposure, little is known about the behavioral health effects. Nicotine, the principle psychoactive substance in SHS, elicits subjective mood and physiological responses in nonsmokers. However, no studies have examined the subjective mood or physiological responses to nicotine in nonsmokers while accounting for prior chronic or acute SHS exposure. Methods: A 7-mg nicotine patch was administered to 17 adult nonsmokers for 2 hr. Main outcome measures obtained at ½ hr, 1 hr, and 2 hr were subjective behavioral drug effects (based on eleven 10-cm Visual Analog Scales [VASs]) and the physiological measures of heart rate, blood pressure, and serum nicotine levels. Analysis of outcome data was based on participants’ chronic (using hair nicotine) or acute (using saliva cotinine) SHS exposure. Results: Greater chronic SHS exposure was negatively associated with pleasurable responses to nicotine administration (“drug feels good” score at 2-hr time point, Spearman’s ρ = −.65, p < .004), whereas greater acute SHS exposure was associated with positive responses (“like feeling of drug” score at 2-hr time point, Spearman’s ρ = .63, p < .01). There were no associations between chronic or acute exposure and physiological changes in response to nicotine administration. Discussion: The findings of this study may be useful in providing preliminary empirical data for future explorations of the mechanism whereby SHS exposure can influence behavioral outcomes in nonsmokers. Such studies can inform future interventions to reduce the physical and behavioral health risks associated with SHS exposure.

Physiological responses to carbon dioxide in embryonic red-eared slider turtles,Trachemys scripta

1992 ◽  
Vol 264 (1) ◽  
pp. 1-10 ◽  
Author(s):  
Cory R. Etchberger ◽  
Michael A. Ewert ◽  
John B. Phillips ◽  
Craig E. Nelson ◽  
Henry D. Prange
Keyword(s):  
Carbon Dioxide ◽  
Physiological Responses ◽  
Trachemys Scripta
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