Berry, R.B., Mahutte, C.K., & Light, R.W. (1993) “Effect of hypercapnia on the arousal response to airway occlusion during sleep in normal subjects”. Journal of Applied Physiology, 74(5), 2269-2275
Berthon-Jones, M., & Sullivan, C.E. (1984). “Ventilation and arousal responses to hypercapnia in normal sleeping humans”. Journal of Applied Physiology, 57(1), 59-67
Frey, M. A., Sulzman, F. M., Oser, H.,& Ruyters, G. (1998). “Joint NASA-ESA-DARA study, part one: the effects of moderately elevated ambient carbon dioxide levels on human physiology and performance”. Aviation, Space, and Environmental Medicine, 69(3), 282-284
Gundel, A., Drescher, J., & Weihrauch, M. R. (1998a). “Joint NASA-ESA-DARA Study, part three: cardiorespiratory response to elevated CO2 levels during sleep”. Aviation, Space, and Environmental Medicine, 69(5), 496-500
Samel, A., Vejvoda,M., Wittiber, K., & Wenzel, J. (1998). “Joint NASA-ESA-DARA study. Part three: circadian rhythms and activity-rest cycle under different CO2 concentrations”. Aviation, Space, and Environmental Medicine, 69(5), 501-505.
Laverge & Janssens 2011; 6 students over 1 month with 2-week periods of open/closed windows, comparing peaks of 1000-2500PPM to 3000-4500PPM. Some evidence for improvement.
Strøm-Tejsen et al 2014a; within-subject comparison of 14 students sleeping in 660PPM vs 2585PPM conditions
Strøm-Tejsen et al 2014b; within-subject comparison of 16 students sleeping in 835PPM vs 2395PPM conditions (as controlled by a fan with a CO2 sensor; very quiet but blinding may not’ve succeeded)
Drowsiness which can affect work performance, is often elicited through self-reporting. This paper demonstrates the potential to use EEG to objectively quantify changes to drowsiness due to poor indoor air quality. Continuous EEG data was recorded from 23 treatment group participants subject to artificially raised indoor CO2 concentrations (average 2,700 ± 300 ppm) for approximately 10 minutes and 13 control group participants subject to the same protocol without additional CO2 (average 830 ± 70 ppm). EEG data were analysed for markers of drowsiness according neurophysiological methods at three stages of the experiment, Baseline, High CO2 and Post-Ventilation. Treatment group participants’ EEG data yielded a closer approximation to drowsiness than that of control group participants during the High CO2 condition, despite no significant group differences in self-reported sleepiness. Future work is required to determine the persistence of these changes to EEG over longer exposures and to better isolate the specific effect of CO2 on drowsiness compared to other environmental or physiological factors.
Sleep oriented studies:
Ayas, N.T., Brown, R., & Shea, S.A. (2000). “Hypercapnia can induce arousal from sleep in the absence of altered respiratory mechanoreception”. AmericanJournal ofRespiratory andCriticalCare Medicine, 162(3 Pt 1), 1004-1008.
Berry, R.B., Mahutte, C.K., & Light, R.W. (1993) “Effect of hypercapnia on the arousal response to airway occlusion during sleep in normal subjects”. Journal of Applied Physiology, 74(5), 2269-2275
Berthon-Jones, M., & Sullivan, C.E. (1984). “Ventilation and arousal responses to hypercapnia in normal sleeping humans”. Journal of Applied Physiology, 57(1), 59-67
Frey, M. A., Sulzman, F. M., Oser, H.,& Ruyters, G. (1998). “Joint NASA-ESA-DARA study, part one: the effects of moderately elevated ambient carbon dioxide levels on human physiology and performance”. Aviation, Space, and Environmental Medicine, 69(3), 282-284
Gundel, A., Drescher, J., & Weihrauch, M. R. (1998a). “Joint NASA-ESA-DARA Study, part three: cardiorespiratory response to elevated CO2 levels during sleep”. Aviation, Space, and Environmental Medicine, 69(5), 496-500
Samel, A., Vejvoda,M., Wittiber, K., & Wenzel, J. (1998). “Joint NASA-ESA-DARA study. Part three: circadian rhythms and activity-rest cycle under different CO2 concentrations”. Aviation, Space, and Environmental Medicine, 69(5), 501-505.
Laverge & Janssens 2011; 6 students over 1 month with 2-week periods of open/closed windows, comparing peaks of 1000-2500PPM to 3000-4500PPM. Some evidence for improvement.
Strøm-Tejsen et al 2014a; within-subject comparison of 14 students sleeping in 660PPM vs 2585PPM conditions
Strøm-Tejsen et al 2014b; within-subject comparison of 16 students sleeping in 835PPM vs 2395PPM conditions (as controlled by a fan with a CO2 sensor; very quiet but blinding may not’ve succeeded)
A new one: “Using EEG to characterise drowsiness during short duration exposure to elevated indoor Carbon Dioxide concentrations”, Snow et al 2018:
Some recent kerfluffles over CO2 (prompted by people rediscovering Allen et al 2016 on Twitter etc) lead me to one I missed: “Breathing Carbon Dioxide (4% for 1-Hour) Slows Response Selection, Not Stimulus Encoding”, Vercruyssen 2014. 4% is a ton but the results remain subtle, at best.