Related Experiment Videos
The role of hypoxia in erectile dysfunction mechanisms
V Verratti1, C Di Giulio, F Berardinelli
1Department of Medicine and Aging Science, G.d' Annunzio University, Chieti, Italy. vittorelibero@hotmail.it
International Journal of Impotence Research
|June 1, 2007
Summary
High altitude hypoxia significantly reduces sleep-related erections (SREs) and erectile rigidity in sexually potent men. This study highlights hypoxia
Area of Science:
- Physiology
- Altitude Medicine
- Sexual Health
Background:
- Chronic hypoxia is linked to various health issues, including erectile dysfunction (ED).
- Sleep-related erections (SREs) normally occur during REM sleep in potent men.
- Hypoxia is a natural condition at high altitudes due to decreased oxygen levels.
Purpose of the Study:
- To investigate the relationship between SREs and a hypoxic environment at high altitudes.
- To assess the impact of increasing altitude on erectile function.
Main Methods:
- SREs were monitored using an erectometer (RigiScan) in three male climbers over 26 days.
- Measurements were taken at altitudes ranging from 2000 to 5600 m.
- Statistical analysis included ANOVA and Newman-Keuls tests for comparisons.
Main Results:
- At altitudes above 4450 m, significant reductions in penile rigidity (80-100% and 60-79%) were observed.
- Mean rigidity and rigidity duration (80-100% at tip and base) decreased with increasing altitude.
- No significant changes were noted in lower rigidity levels (0-39%) or overall SRE duration and number.
Conclusions:
- High altitude-induced hypoxia impairs erectile rigidity in otherwise potent men.
- These findings underscore the critical role of oxygen levels in the physiological pathways of erectile dysfunction.
Related Concept Videos
01:28Nitric Oxide Signaling Pathway
Nitric oxide (NO), an inorganic gas, acts as a potent second messenger in most animal and plant tissues. NO diffuses out of the cells that produce it and enters the neighboring cells to generate a downstream response. NO synthase (NOS) catalyzes NO production by the deamination of the amino acid arginine. There are three isoforms of NOS. Endothelial cells have endothelial NOS (eNOS), nerve and muscle cells have neuronal NOS (nNOS), and macrophages produce inducible NOS (iNOS) upon exposure to...
01:23Hypoxia
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...
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...
01:28Treatment for Pulmonary Arterial Hypertension: Phosphodiesterase Inhibitors
Phosphodiesterase 5 (PDE5) inhibitors are potent enzymes that function to hydrolyze cyclic nucleotides to their corresponding 5' monophosphates. Their unique biochemical properties have been applied in treating Pulmonary Arterial Hypertension (PAH).
Among the PDE5 inhibitors, sildenafil (Revatio) stands out as a competitive and selective inhibitor. It operates by elevating cellular levels of cGMP and augmenting signaling through the cGMP-PKG pathway, promoting vasodilation. Upon oral...
Among the PDE5 inhibitors, sildenafil (Revatio) stands out as a competitive and selective inhibitor. It operates by elevating cellular levels of cGMP and augmenting signaling through the cGMP-PKG pathway, promoting vasodilation. Upon oral...
01:30Pulmonary Hypertension: Classification and Pathogenesis
Pulmonary hypertension (PH) is a severe health condition in which the mean pulmonary arterial pressure increases to 25 mmHg or more, even when the body is at rest. This high pressure in the blood vessels that transport blood from the heart to the lungs can cause various symptoms, including shortness of breath, can lead to right heart failure, and significantly affect the overall quality of life.
There are various classifications for PH, each relating to different underlying causes and also...
There are various classifications for PH, each relating to different underlying causes and also...
01:17Male Sexual Response: Erection & Ejaculation
Sexual stimulation can take various forms, such as physical touch and visual or auditory cues. When this happens, the parasympathetic reflex in the sacral portion of the spinal cord is activated. This reflex stimulates the release of nitric oxide (NO), which then dilates the arterioles in the penis, increasing blood flow to the erectile tissues - the corpora cavernosa and corpus spongiosum.
The blood filling the erectile tissues compresses the veins, which helps to prevent blood from leaving...
The blood filling the erectile tissues compresses the veins, which helps to prevent blood from leaving...
01:24Regulation of Angiogenesis and Blood Supply
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 hydroxylase and factor...