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Kujawski S, Słomko J, Morten KJ, Murovska M, Buszko K, Newton JL, Zalewski P. Autonomic and Cognitive Function Response to Normobaric Hyperoxia Exposure in Healthy Subjects. Preliminary Study. Medicina (Kaunas) 2020; 56:E172. [PMID: 32290164 PMCID: PMC7230641 DOI: 10.3390/medicina56040172] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/04/2020] [Revised: 03/18/2020] [Accepted: 04/08/2020] [Indexed: 12/26/2022]
Abstract
Background and objective: This is the first study to investigate the effect of high-flow oxygen therapy, using a normobaric chamber on cognitive, biochemical (oxidative stress parameters and the level of neurotrophins), cardiovascular and autonomic functioning. Materials and methods: 17 healthy volunteers, eight males and nine females, with a mean age of 37.5 years, were examined. The experimental study involved ten two-hour exposures in a normobaric chamber with a total pressure of 1500 hPa (32–40 kPa partial pressure of oxygen, 0.7–2 kPa of carbon dioxide and 0.4–0.5 kPa of hydrogen). Cognitive function was assessed by using Trail Making Test parts A, B and difference in results of these tests (TMT A, TMT B and TMT B-A); California Verbal Learning Test (CVLT); Digit symbol substitution test (DSST); and Digit Span (DS). Fatigue (Fatigue Severity Scale (FSS)), cardiovascular, autonomic and baroreceptor functioning (Task Force Monitor) and biochemical parameters were measured before and after intervention. Results: After 10 sessions in the normobaric chamber, significant decreases in weight, caused mainly by body fat % decrease (24.86 vs. 23.93%, p = 0.04 were observed. TMT part A and B results improved (p = 0.0007 and p = 0.001, respectively). In contrast, there was no statistically significant influence on TMT B-A. Moreover, decrease in the number of symbols left after a one-minute test in DSST was noted (p = 0.0001). The mean number of words correctly recalled in the CVLT Long Delay Free Recall test improved (p = 0.002), and a reduction in fatigue was observed (p = 0.001). Biochemical tests showed a reduction in levels of malondialdehyde (p < 0.001), with increased levels of Cu Zn superoxide dismutase (p < 0.001), Neurotrophin 4 (p = 0.0001) and brain-derived neurotrophic factor (p = 0.001). A significant increase in nitric oxide synthase 2 (Z = 2.29, p = 0.02) and Club cell secretory protein (p = 0.015) was also noted. Baroreceptor function was significantly improved after normobaric exposures (p = 0.003). Significant effect of normobaric exposures and BDNF in CVLT Long Delay Free Recall was noted. Conclusions: This study demonstrates that 10 exposures in a normobaric chamber have a positive impact on visual information and set-shifting processing speed and increase auditory-verbal short-term memory, neurotrophic levels and baroreceptor function. A response of the respiratory tract to oxidative stress was also noted. There is a need to rigorously examine the safety of normobaric therapy. Further studies should be carried out with physician examination, both pre and post treatment.
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Affiliation(s)
- Sławomir Kujawski
- Department of Hygiene, Epidemiology, Ergonomics and Postgraduate Training, Division of Ergonomics and Exercise Physiology, Collegium Medicum in Bydgoszcz, Nicolaus Copernicus University in Torun, 85-094 Bydgoszcz, Poland; (J.S.); (P.Z.)
| | - Joanna Słomko
- Department of Hygiene, Epidemiology, Ergonomics and Postgraduate Training, Division of Ergonomics and Exercise Physiology, Collegium Medicum in Bydgoszcz, Nicolaus Copernicus University in Torun, 85-094 Bydgoszcz, Poland; (J.S.); (P.Z.)
| | - Karl J. Morten
- Nuffield Department of Women’s and Reproductive Health, University of Oxford, Oxford OX3 9DU, UK;
| | - Modra Murovska
- Institute of Microbiology and Virology, Riga Stradiņš University, LV-1067 Riga, Latvia;
| | - Katarzyna Buszko
- Department of Theoretical Foundations of Bio-Medical Science and Medical Informatics, Collegium Medicum, Nicolaus Copernicus University, 85-067 Bydgoszcz, Poland;
| | - Julia L. Newton
- Institute of Cellular Medicine, The Medical School, Newcastle University, Framlington Place, Newcastle-upon-Tyne NE2 4HH, UK;
| | - Paweł Zalewski
- Department of Hygiene, Epidemiology, Ergonomics and Postgraduate Training, Division of Ergonomics and Exercise Physiology, Collegium Medicum in Bydgoszcz, Nicolaus Copernicus University in Torun, 85-094 Bydgoszcz, Poland; (J.S.); (P.Z.)
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Kizuk SAD, Vuong W, MacLean JE, Dickson CT, Mathewson KE. Electrophysiological correlates of hyperoxia during resting‐state EEG in awake human subjects. Psychophysiology 2019; 56:e13401. [DOI: 10.1111/psyp.13401] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Revised: 03/29/2019] [Accepted: 04/12/2019] [Indexed: 12/21/2022]
Affiliation(s)
- Sayeed A. D. Kizuk
- Neuroscience and Mental Health Institute, University of Alberta Edmonton Alberta Canada
| | - Wesley Vuong
- Department of Psychology University of Alberta Edmonton Alberta Canada
| | - Joanna E. MacLean
- Department of Pediatrics University of Alberta Edmonton Alberta Canada
| | - Clayton T. Dickson
- Neuroscience and Mental Health Institute, University of Alberta Edmonton Alberta Canada
- Department of Psychology University of Alberta Edmonton Alberta Canada
- Department of Physiology University of Alberta Edmonton Alberta Canada
| | - Kyle E. Mathewson
- Neuroscience and Mental Health Institute, University of Alberta Edmonton Alberta Canada
- Department of Psychology University of Alberta Edmonton Alberta Canada
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Hauer BE, Negash B, Chan K, Vuong W, Colbourne F, Pagliardini S, Dickson CT. Hyperoxia enhances slow-wave forebrain states in urethane-anesthetized and naturally sleeping rats. J Neurophysiol 2018; 120:1505-1515. [PMID: 29947598 DOI: 10.1152/jn.00373.2018] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Oxygen (O2) is a crucial element for physiological functioning in mammals. In particular, brain function is critically dependent on a minimum amount of circulating blood levels of O2 and both immediate and lasting neural dysfunction can result following anoxic or hypoxic episodes. Although the effects of deficiencies in O2 levels on the brain have been reasonably well studied, less is known about the influence of elevated levels of O2 (hyperoxia) in inspired gas under atmospheric pressure. This is of importance due to its typical use in surgical anesthesia, in the treatment of stroke and traumatic brain injury, and even in its recreational or alternative therapeutic use. Using local field potential (EEG) recordings in spontaneously breathing urethane-anesthetized and naturally sleeping rats, we characterized the influence of different levels of O2 in inspired gases on brain states. While rats were under urethane anesthesia, administration of 100% O2 elicited a significant and reversible increase in time spent in the deactivated (i.e., slow-wave) state, with concomitant decreases in both heartbeat and respiration rates. Increasing the concentration of carbon dioxide (to 5%) in inspired gas produced the opposite result on EEG states, mainly a decrease in the time spent in the deactivated state. Consistent with this, decreasing concentrations of O2 (to 15%) in inspired gases decreased time spent in the deactivated state. Further confirmation of the hyperoxic effect was found in naturally sleeping animals where it similarly increased time spent in slow-wave (nonrapid eye movement) states. Thus alterations of O2 in inspired air appear to directly affect forebrain EEG states, which has implications for brain function, as well as for the regulation of brain states and levels of forebrain arousal during sleep in both normal and pathological conditions. NEW & NOTEWORTHY We show that alterations of oxygen concentration in inspired air biases forebrain EEG state. Hyperoxia increases the prevalence of slow-wave states. Hypoxia and hypercapnia appear to do the opposite. This suggests that oxidative metabolism is an important stimulant for brain state.
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Affiliation(s)
- Brandon E Hauer
- Neuroscience and Mental Health Institute, University of Alberta , Edmonton, Alberta , Canada
| | - Biruk Negash
- Department of Psychology, University of Alberta , Edmonton, Alberta , Canada
| | - Kingsley Chan
- Department of Psychology, University of Alberta , Edmonton, Alberta , Canada
| | - Wesley Vuong
- Department of Psychology, University of Alberta , Edmonton, Alberta , Canada
| | - Frederick Colbourne
- Neuroscience and Mental Health Institute, University of Alberta , Edmonton, Alberta , Canada.,Department of Psychology, University of Alberta , Edmonton, Alberta , Canada
| | - Silvia Pagliardini
- Neuroscience and Mental Health Institute, University of Alberta , Edmonton, Alberta , Canada.,Department of Physiology, University of Alberta , Edmonton, Alberta , Canada
| | - Clayton T Dickson
- Neuroscience and Mental Health Institute, University of Alberta , Edmonton, Alberta , Canada.,Department of Psychology, University of Alberta , Edmonton, Alberta , Canada.,Department of Physiology, University of Alberta , Edmonton, Alberta , Canada
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