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Related Concept Videos

Hypoxia01:23

Hypoxia

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Hypoxia is a medical condition characterized by an inadequate oxygen supply to body tissues. It typically manifests as a bluish discoloration of the skin and mucosae, especially in fair-skinned individuals, when hemoglobin (Hb) saturation drops below 75%.
Types of Hypoxia
There are four primary types of hypoxia, each resulting from a different cause:
1. Anemic hypoxia: This type occurs due to insufficient oxygen delivery caused by a lack of red blood cells (RBCs) or RBCs with abnormal or...
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Regulation of Angiogenesis and Blood Supply01:24

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Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits.  Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl...
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Supramaximal Intensity Hypoxic Exercise and Vascular Function Assessment in Mice
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Intermittent Hypoxic Exposure Reduces Endothelial Dysfunction.

Agnieszka Zembron-Lacny1, Anna Tylutka1, Eryk Wacka2

  • 1Department of Applied and Clinical Physiology, Collegium Medicum University of Zielona Gora, Poland.

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|September 14, 2020
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Summary

Intermittent hypoxic exposure (IHE) combined with intense training in elite athletes enhances antioxidant and anti-inflammatory responses, potentially reducing cardiovascular disease (CVD) risk. This non-pharmacological method shows promise for athletes despite increased oxidative stress markers.

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Area of Science:

  • Exercise Physiology
  • Environmental Physiology
  • Cardiovascular Health

Background:

  • Intermittent exposure to hypoxia (IHE) stimulates erythropoietin (EPO) production, aiding adaptation to intense physical activity.
  • Moderate hypoxia may offer cardiovascular protection, but effects of intense physical activity with IHE on cardiovascular risk factors are less understood.

Purpose of the Study:

  • To investigate the impact of intense physical activity combined with IHE on oxi-inflammatory mediators.
  • To examine the interaction between these mediators and conventional cardiovascular disease (CVD) risk factors in elite athletes.

Main Methods:

  • Elite athletes underwent a 6-day IHE cycle, with blood samples analyzed for hydrogen peroxide (H2O2), nitric oxide (NO), 3-nitrotyrosine (3-NT), IL-1β, TNFα, hsCRP, and HSP27.
  • Erythropoietin (EPO) levels were measured daily during hypoxia.
  • Lipoprotein levels (LDL, non-HDL) and haematological markers were also assessed.

Main Results:

  • IHE significantly increased H2O2, NO, and HSP27, while decreasing 3-NT, suggesting improved NO bioavailability and endothelial function.
  • Proinflammatory markers (IL-1β, hsCRP) increased but remained within reference values.
  • EPO levels peaked on day 3 and correlated with the NO/H2O2 ratio; LDL and non-HDL cholesterol showed a decreasing trend.

Conclusions:

  • Combined IHE and sports activity in elite athletes may reduce endothelial dysfunction and atherogenesis risk.
  • Despite enhanced oxidative and inflammatory processes, 6-day IHE appears to be a viable non-pharmacological strategy for mitigating CVD risk, particularly in athletes undergoing strenuous training.