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Pre-acclimation to altitude in young adults: choosing a hypoxic pattern at sea level which provokes significant haematological adaptations. Eur J Appl Physiol 2021; 122:395-407. [PMID: 34750724 DOI: 10.1007/s00421-021-04837-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Accepted: 10/17/2021] [Indexed: 10/19/2022]
Abstract
PURPOSE This single-blind, repeated measures study evaluated adaptive and maladaptive responses to continuous and intermittent hypoxic patterns in young adults. METHODS Changes in haematological profile, stress and cardiac damage were measured in ten healthy young participants during three phases: (1) breathing normoxic air (baseline); (2) breathing normoxic air via a mask (Sham-controls); (3) breathing intermittent hypoxia (IH) via a mask, mean peripheral oxygen saturation (SpO2) of 85% ~ 70 min of hypoxia. After a 5-month washout period, participants repeated this three-phase protocol with phase, (4) consisting of continuous hypoxia (CH), mean SpO2 = 85%, ~ 70 min of hypoxia. Measures of the red blood cell count (RBCc), haemoglobin concentration ([Hb]), haematocrit (Hct), percentage of reticulocytes (% Retics), secretory immunoglobulin A (S-IgA), cortisol, cardiac troponin T (cTnT) and the erythropoietic stimulation index (calculated OFF-score) were compared across treatments. RESULTS Despite identical hypoxic durations at the same fixed SpO2, no significant effects were observed in either CH or Sham-CH control, compared to baseline. While IH and Sham-IH controls demonstrated significant increases in: RBCc; [Hb]; Hct; and the erythropoietic stimulation index. Notably, the % Retics decreased significantly in response to IH (-31.9%) or Sham-IH control (-23.6%), highlighting the importance of including Sham-controls. No difference was observed in S-IgA, cortisol or cTnT. CONCLUSION The IH but not CH pattern significantly increased key adaptive haematological responses, without maladaptive increases in S-IgA, cortisol or cTnT, indicating that the IH hypoxic pattern would be the best method to boost haematological profiles prior to ascent to altitude.
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Tobin B, Costalat G, Renshaw GMC. Intermittent not continuous hypoxia provoked haematological adaptations in healthy seniors: hypoxic pattern may hold the key. Eur J Appl Physiol 2020; 120:707-718. [DOI: 10.1007/s00421-020-04310-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2019] [Accepted: 01/27/2020] [Indexed: 02/04/2023]
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Kurhaluk N, Lukash O, Nosar V, Portnychenko A, Portnichenko V, Wszedybyl-Winklewska M, Winklewski PJ. Liver mitochondrial respiratory plasticity and oxygen uptake evoked by cobalt chloride in rats with low and high resistance to extreme hypobaric hypoxia. Can J Physiol Pharmacol 2019; 97:392-399. [PMID: 30681909 DOI: 10.1139/cjpp-2018-0642] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
High-altitude intolerance and consequently high-altitude sickness, is difficult to predict. Liver is an essential organ in glucose and lipid metabolism, and may play key role in the adaptation to high altitude. In response to extreme high altitude, mitochondrial respiration exhibits changes in substrate metabolism, mitochondrial electron transport chain activity, and respiratory coupling. We determined the cobalt chloride (CoCl2) effects on liver mitochondrial plasticity and oxygen uptake in rats with low resistance (LR) and high resistance (HR) to extreme hypobaric hypoxia. The polarographic method proposed by Chance and Williams was used as a simple and effective tool to trace mitochondrial functionality and oxygen consumption. HR rats had more efficient processes of NADH- and FAD-generated mitochondrial oxidation. CoCl2 promoted more efficient NADH-generated and diminished less efficient FAD-generated mitochondrial respiratory reactions in HR rats. CoCl2 diminished both aerobic and anaerobic processes in LR rats. Glutamate and pyruvate substrates of NADH-generated mitochondrial pathways were highly affected by CoCl2. Red blood cells acted as cobalt depots in HR and LR rats. We have unveiled several mechanisms leading to differentiated mitochondrial respiratory responses to hypobaric hypoxia in LR and HR rats. Our study strongly supports the existence of adaptive liver mitochondrial plasticity to extreme hypoxia.
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Affiliation(s)
- Natalia Kurhaluk
- a Department of Physiology, Institute of Biology and Environment Protection, Pomeranian University of Slupsk, Słupsk, Poland
| | - Oleksaner Lukash
- b Department of Ecology and Nature Protection, T.G. Shevchenko National University "Chernihiv Colehium", Chernihiv, Ukraine
| | - Valentina Nosar
- c Department of Hypoxia, Bogomoletz Institute of Physiology, National Academy of Sciences of Ukraine, Kiev, Ukraine; International Centre for Medical, Astronomical and Ecological Research, National Academy of Sciences of Ukraine, Kiev, Ukraine
| | - Alla Portnychenko
- c Department of Hypoxia, Bogomoletz Institute of Physiology, National Academy of Sciences of Ukraine, Kiev, Ukraine; International Centre for Medical, Astronomical and Ecological Research, National Academy of Sciences of Ukraine, Kiev, Ukraine
| | - Volodymyr Portnichenko
- c Department of Hypoxia, Bogomoletz Institute of Physiology, National Academy of Sciences of Ukraine, Kiev, Ukraine; International Centre for Medical, Astronomical and Ecological Research, National Academy of Sciences of Ukraine, Kiev, Ukraine
| | | | - Pawel J Winklewski
- d Department of Human Physiology, Faculty of Health Sciences, Medical University of Gdansk, Gdansk, Poland.,e Department of Clinical Anatomy and Physiology, Faculty of Health Sciences, Pomeranian University of Slupsk, Slupsk, Poland
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Qiao J, Zhou M, Li Z, Ren J, Gao G, Cao G, Shen H, Lu S. Comparison of remote ischemic preconditioning and intermittent hypoxia training in fracture healing. Mol Med Rep 2018; 19:1867-1874. [PMID: 30592272 DOI: 10.3892/mmr.2018.9788] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2018] [Accepted: 11/07/2018] [Indexed: 11/06/2022] Open
Abstract
Fracture healing in elderly patients is an emerging public health concern. As non‑drug treatments, intermittent hypoxia training (IHT) and remote ischemic preconditioning (RIPC) are considered to have substantial advantages and to aid fracture healing in elderly patients. The purpose of the present study was to evaluate and compare the effects of IHT and RIPC on fracture healing. Micro‑computed tomography (micro‑CT) and biomechanical testing were used to assess the morphology and structural properties of bone callus dissected from aged rats with tibial fractures. In addition, hypoxia‑inducible factor‑1α (HIF‑1α) and its target gene, associated with the healing process, were investigated by reverse transcription‑quantitative polymerase chain reaction and western blot analyses. The micro‑CT‑based parameters, including bone mineral density and trabecular number, were measured, and significant differences were identified between the experimental and control groups. The IHT group exhibited superior bone formation and mineralization rates compared with the RIPC group. The biomechanical testing revealed that the ultimate loading and stiffness values were significantly higher in the IHT group compared with those in the RIPC group. In accordance with previous studies, RIPC exerted a similar effect in increasing the expression of HIF‑1α, and its downstream genes, throughout the course of healing. In addition, the IHT group exhibited increased expression levels of HIF‑1α compared with the RIPC group. Taken together, the results suggested that IHT and RIPC significantly enhanced fracture healing; however, IHT exhibited superior bone formation and healing effects compared with RIPC.
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Affiliation(s)
- Junjie Qiao
- Department of Orthopedics, Xuanwu Hospital, Capital Medical University, Beijing 100053, P.R. China
| | - Meng Zhou
- Department of Orthopedics, Beijing Jishuitan Hospital, 4th Medical College of Peking University, Beijing 100035, P.R. China
| | - Zheng Li
- Department of Orthopedics, Xuanwu Hospital, Capital Medical University, Beijing 100053, P.R. China
| | - Jie Ren
- Department of Orthopedics, Xuanwu Hospital, Capital Medical University, Beijing 100053, P.R. China
| | - Guanghan Gao
- Department of Orthopedics, Xuanwu Hospital, Capital Medical University, Beijing 100053, P.R. China
| | - Guanglei Cao
- Department of Orthopedics, Xuanwu Hospital, Capital Medical University, Beijing 100053, P.R. China
| | - Huiliang Shen
- Department of Orthopedics, Xuanwu Hospital, Capital Medical University, Beijing 100053, P.R. China
| | - Shibao Lu
- Department of Orthopedics, Xuanwu Hospital, Capital Medical University, Beijing 100053, P.R. China
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Serebrovska TV, Portnychenko AG, Drevytska TI, Portnichenko VI, Xi L, Egorov E, Gavalko AV, Naskalova S, Chizhova V, Shatylo VB. Intermittent hypoxia training in prediabetes patients: Beneficial effects on glucose homeostasis, hypoxia tolerance and gene expression. Exp Biol Med (Maywood) 2017; 242:1542-1552. [PMID: 28758418 DOI: 10.1177/1535370217723578] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
The present study aimed at examining beneficial effects of intermittent hypoxia training (IHT) under prediabetic conditions. We investigate the effects of three-week IHT on blood glucose level, tolerance to acute hypoxia, and leukocyte mRNA expression of hypoxia inducible factor 1α (HIF-1α) and its target genes, i.e. insulin receptor, facilitated glucose transporter-solute carrier family-2, and potassium voltage-gated channel subfamily J. Seven healthy and 11 prediabetic men and women (44-70 years of age) were examined before, next day and one month after three-week IHT (3 sessions per week, each session consisting 4 cycles of 5-min 12% O2 and 5-min room air breathing). We found that IHT afforded beneficial effects on glucose homeostasis in patients with prediabetes reducing fasting glucose and during standard oral glucose tolerance test. The most pronounced positive effects were observed at one month after IHT termination. IHT also significantly increased the tolerance to acute hypoxia (i.e. SaO2 level at 20th min of breathing with 12% O2) and improved functional parameters of respiratory and cardiovascular systems. IHT stimulated HIF-1α mRNA expression in blood leukocytes in healthy and prediabetic subjects, but in prediabetes patients the maximum increase was lagged. The greatest changes in mRNA expression of HIF-1α target genes occurred a month after IHT and coincided with the largest decrease in blood glucose levels. The higher expression of HIF-1α was positively associated with higher tolerance to hypoxia and better glucose homeostasis. In conclusion, our results suggest that IHT may be useful for preventing the development of type 2 diabetes. Impact statement The present study investigated the beneficial effects of intermittent hypoxia training (IHT) in humans under prediabetic conditions. We found that three-week moderate IHT induced higher HIF-1α mRNA expressions as well as its target genes, which were positively correlated with higher tolerance to acute hypoxia and better glucose homeostasis in both middle-aged healthy and prediabetic subjects. This small clinical trial has provided new data suggesting a potential utility of IHT for management of prediabetes patients.
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Affiliation(s)
| | - Alla G Portnychenko
- 1 Bogomoletz Institute of Physiology, Kiev 01024, Ukraine.,2 ICAMER, National Academy of Sciences of Ukraine, Kiev 03680, Ukraine
| | - Tetiana I Drevytska
- 1 Bogomoletz Institute of Physiology, Kiev 01024, Ukraine.,2 ICAMER, National Academy of Sciences of Ukraine, Kiev 03680, Ukraine
| | - Vladimir I Portnichenko
- 1 Bogomoletz Institute of Physiology, Kiev 01024, Ukraine.,2 ICAMER, National Academy of Sciences of Ukraine, Kiev 03680, Ukraine
| | - Lei Xi
- 3 Pauley Heart Center, Department of Internal Medicine, Virginia Commonwealth University, Richmond, VA 23298, USA.,4 School of Sports Medicine and Health, Chengdu Sport University, Chengdu 610041, China
| | - Egor Egorov
- 5 CELLGYM Technologies GmbH, Berlin 10623, Germany
| | - Anna V Gavalko
- 6 D.F. Chebotarev State Institute of Gerontology, Kiev 04114, Ukraine
| | | | | | - Valeriy B Shatylo
- 6 D.F. Chebotarev State Institute of Gerontology, Kiev 04114, Ukraine
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Gozal D, Gileles-Hillel A, Cortese R, Li Y, Almendros I, Qiao Z, Khalyfa AA, Andrade J, Khalyfa A. Visceral White Adipose Tissue after Chronic Intermittent and Sustained Hypoxia in Mice. Am J Respir Cell Mol Biol 2017; 56:477-487. [PMID: 28107636 DOI: 10.1165/rcmb.2016-0243oc] [Citation(s) in RCA: 59] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
Angiogenesis, a process induced by hypoxia in visceral white adipose tissues (vWAT) in the context of obesity, mediates obesity-induced metabolic dysfunction and insulin resistance. Chronic intermittent hypoxia (IH) and sustained hypoxia (SH) induce body weight reductions and insulin resistance of different magnitudes, suggesting different hypoxia inducible factor (HIF)-1α-related activity. Eight-week-old male C57BL/6J mice (n = 10-12/group) were exposed to either IH, SH, or room air (RA). vWAT were analyzed for insulin sensitivity (phosphorylated (pAKT)/AKT), HIF-1α transcription using chromatin immunoprecipitation (ChIP)-sequencing, angiogenesis using immunohistochemistry, and gene expression of different fat cell markers and HIF-1α gene targets using quantitative polymerase chain reaction or microarrays. Body and vWAT weights were reduced in hypoxia (SH > IH > RA; P < 0.001), with vWAT in IH manifesting vascular rarefaction and increased proinflammatory macrophages. HIF-1α ChIP-sequencing showed markedly increased binding sites in SH-exposed vWAT both at 6 hours and at 6 weeks compared with IH, the latter also showing decreased vascular endothelial growth factor, endothelial nitric oxide synthase, P2RX5, and PAT2 expression, and insulin resistance (IH > > > SH = RA; P < 0.001). IH induces preferential whitening of vWAT, as opposed to prominent browning in SH. Unlike SH, IH elicits early HIF-1α activity that is unsustained over time and is accompanied by concurrent vascular rarefaction, inflammation, and insulin resistance. Thus, the dichotomous changes in HIF-1α transcriptional activity and brown/beige/white fat balance in IH and SH should enable exploration of mechanisms by which altered sympathetic outflow, such as that which occurs in apneic patients, results in whitening, rather than the anticipated browning of adipose tissues that occurs in SH.
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Affiliation(s)
- David Gozal
- 1 Section of Pediatric Sleep Medicine, Department of Pediatrics, Pritzker School of Medicine, and
| | - Alex Gileles-Hillel
- 1 Section of Pediatric Sleep Medicine, Department of Pediatrics, Pritzker School of Medicine, and
| | - Rene Cortese
- 1 Section of Pediatric Sleep Medicine, Department of Pediatrics, Pritzker School of Medicine, and
| | - Yan Li
- 2 Center for Research Informatics, Biological Sciences Division, The University of Chicago, Chicago, Illinois
| | - Isaac Almendros
- 1 Section of Pediatric Sleep Medicine, Department of Pediatrics, Pritzker School of Medicine, and.,3 Unitat de Biofísica i Bioenginyeria, Facultat de Medicina, Universitat de Barcelona-IDIBAPS, Barcelona, Spain; and.,4 CIBER de Enfermedades Respiratorias, Barcelona, Spain
| | - Zhuanhong Qiao
- 1 Section of Pediatric Sleep Medicine, Department of Pediatrics, Pritzker School of Medicine, and
| | - Ahamed A Khalyfa
- 1 Section of Pediatric Sleep Medicine, Department of Pediatrics, Pritzker School of Medicine, and
| | - Jorge Andrade
- 2 Center for Research Informatics, Biological Sciences Division, The University of Chicago, Chicago, Illinois
| | - Abdelnaby Khalyfa
- 1 Section of Pediatric Sleep Medicine, Department of Pediatrics, Pritzker School of Medicine, and
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Serebrovskaya TV, Xi L. Intermittent hypoxia training as non-pharmacologic therapy for cardiovascular diseases: Practical analysis on methods and equipment. Exp Biol Med (Maywood) 2016; 241:1708-23. [PMID: 27407098 DOI: 10.1177/1535370216657614] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
The global industrialization has brought profound lifestyle changes and environmental pollutions leading to higher risks of cardiovascular diseases. Such tremendous challenges outweigh the benefits of major advances in pharmacotherapies (such as statins, antihypertensive, antithrombotic drugs) and exacerbate the public healthcare burdens. One of the promising complementary non-pharmacologic therapies is the so-called intermittent hypoxia training (IHT) via activation of the human body's own natural defense through adaptation to intermittent hypoxia. This review article primarily focuses on the practical questions concerning the utilization of IHT as a non-pharmacologic therapy against cardiovascular diseases in humans. Evidence accumulated in the past five decades of research in healthy men and patients has suggested that short-term daily sessions consisting 3-4 bouts of 5-7 min exposures to 12-10% O2 alternating with normoxic durations for 2-3 weeks can result in remarkable beneficial effects in treatment of cardiovascular diseases such as hypertension, coronary heart disease, and heart failure. Special attentions are paid to the therapeutic effects of different IHT models, along with introduction of a variety of specialized facilities and equipment available for IHT, including hypobaric chambers, hypoxia gas mixture deliver equipment (rooms, tents, face masks), and portable rebreathing devices. Further clinical trials and thorough evaluations of the risks versus benefits of IHT are much needed to develop a series of standardized and practical guidelines for IHT. Taken together, we can envisage a bright future for IHT to play a more significant role in the preventive and complementary medicine against cardiovascular diseases.
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Affiliation(s)
- Tatiana V Serebrovskaya
- Department of Hypoxia, Bogomoletz Institute of Physiology, National Academy of Sciences of Ukraine, Kiev 01024, Ukraine
| | - Lei Xi
- Pauley Heart Center, Division of Cardiology, Department of Internal Medicine, Virginia Commonwealth University, Richmond, VA 23298-0204, USA Department of Sports Medicine, Chengdu Sport University, Chengdu 610041, China
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Prosser-Loose EJ, Hassan A, Mitchell GS, Muir GD. Delayed Intervention with Intermittent Hypoxia and Task Training Improves Forelimb Function in a Rat Model of Cervical Spinal Injury. J Neurotrauma 2015; 32:1403-12. [DOI: 10.1089/neu.2014.3789] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Affiliation(s)
- Erin J. Prosser-Loose
- Biomedical Sciences, WCVM, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Atiq Hassan
- Biomedical Sciences, WCVM, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Gordon S. Mitchell
- Comparative Biosciences, University of Wisconsin-Madison, Madison, Wisconsin
| | - Gillian D. Muir
- Biomedical Sciences, WCVM, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
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