https://www.thenakedscientists.com/forum/index.php?topic=6576.msg225842#msg225842POIS catecholamines theory
The theory that I have about POIS, is that the symptoms may be caused by a deficiency of one or more of the catecholamines of which noradrenaline may be of most significance.
There are several points that may lead into this direction.
Possible links between POIS and catecholamines:
- During sexual activity noradrenaline levels increase and afterwards they decrease. (1)
- Having a shower with alternating hot and cold water and the sauna including cooling down with a cold water bath / shower both help reducing the symptoms. Noradrenaline and adrenaline levels rise significantly when the body is subjected to cold stress. (2) (3)
- During a period in which POIS symptoms occur, I can have an enlarged / swollen penis. Continuous release of noradrenaline is necessary to keep the penis in a non-erectile state. (4)
- Human semen contains high levels of catecholamines. (5)
- The symptoms of a depletion of catecholamines are similar to many symptoms related to POIS. In the scientific research linked as reference a depletion of dopamine is induced, though this is likely to cause a depletion of noradrenaline and adrenaline besides dopamine alone, as a consequence. Since noradrenaline and adrenaline are produced from dopamine in the body. (6)
- PDE4 inhibits the cyclic AMP (cAMP), which has an inhibition of noradrenaline and adrenaline as a consequence. Therefore, a PDE4-inhibitor has the opposite effect, an increase of cAMP and noradrenaline levels. (7) (
- Among other areas in the body, PDE4 has also been found in male and female sexual organs. I'm not sure if this is relevant. (9) (10)
- Sceletium Tortuosum helps reducing POIS symptoms. It's a herb of which the main active alkaloid is mesembrine, which is a PDE4 inhibitor with a mechanism in a way similar to rolipram (11) that raises levels of noradrenaline. (7) (
- Thinking back about it, I remember that recreational use of amphetamines (speed) in the past showed a reduction of symptoms and after the effects wore off, an increase of the severity of the symptoms was noticed for up until about a week, possibly because of a depletion of noradrenaline. I already had POIS long before I had used any amphetamines, by the way. Amphetamines are known to increase levels of noradrenaline and a temporary depletion of noradrenaline after use is possible.
- Garlic has been reported to help reducing POIS symptoms. Garlic can increase noradrenaline and adrenaline levels. (12)
- Fenugreek has been reported to help reducing POIS symptoms. Fenugreek contains diosgenin, which can produce an oxytocin-like effect. Oxytocin can increase noradrenaline levels. (13)
- Celtic salt has been reported to help reducing POIS symptoms. That person might be sensitive to salt-induced hypertension, which can cause an increase in plasma noradrenaline and adrenaline levels. (14) Another possibility is that the level of oxytocin increases by the salt. (15) Oxytocin can increase noradrenaline levels. (13)
- Heavy physical exercise can reduce POIS symptoms. Heavy physical exercise can increase catecholamines. (16)
- The combination of testosterone and Levitra (vardenafil) has been reported to reduce POIS symptoms. Testosterone may increase noradrenaline. (17) Vardenafil also inhibits PDE4 besides PDE5, although relatively weak. (18) Vardenafil also increases nitric oxide. Nitric oxide can increase dopamine. (19) (20) An increase of dopamine may lead to an increase of the other catecholamines as well. Testosterone and vardenafil can have a synergistic effect. (21)
- Blood test results showed a deficiency of noradrenaline and adrenaline. During the collection of blood for the tests, only mild POIS symptoms were experienced, during a period of more severe symptoms there may be an even greater deficiency. (22)
(1) Plasma noradrenaline and dopamine-beta-hydroxylase during sexual activity Link to full text (PDF) is also available at that website.
(2) The Influence of Cold Stress on Catecholamine Excretion and Oxygen Uptake of Normal Person
(3) Interrelations between Sympathoadrenal System and Hypothalamo-Pituitary-Adrenocortical/Thyroid Systems in Rats Exposed to Cold Stress
(4) Physiological significance of nitrergic transmission in human penile erection
(5) High levels of catecholamines in human semen: a preliminary study
(6) Subjective Experiences During Dopamine Depletion
(7) Rolipram, an Antidepressant That Increases the Availability of cAMP, Transiently Enhances Wakefulness in Rats
(
The antidepressant and antiinflammatory effects of rolipram in the central nervous system
(9) Immunohistochemical Distribution of cAMP- and cGMP-Phosphodiesterase (PDE) Isoenzymes in the Human Prostate
(10) Immunohistochemical Description of Cyclic Nucleotide Phosphodiesterase (PDE) Isoenzymes in the Human Labia Minora
(11) Mesembrine is an inhibitor of PDE4 that follows structure-activity relationship of rolipram
(12) Allyl-Containing Sulfides in Garlic Increase Uncoupling Protein Content in Brown Adipose Tissue, and Noradrenaline and Adrenaline Secretion in Rats ("Administration of diallyldisulfide, diallyltrisulfide and alliin, organosulfur compounds present in garlic, significantly increased plasma noradrenaline and adrenaline concentrations")
(13) Facilitative role of endogenous oxytocin in noradrenaline release in the rat supraoptic nucleus
(14) Genetic influence on brain catecholamines: high brain noradrenaline in salt-sensitive rats
(15) Release of oxytocin induced by salt loading and its influence on renal excretion in the male rat
(16) FREE AND CONJUGATED CATECHOLAMINES IN HUMAN PLASMA DURING PHYSICAL EXERCISE
(17) Effects of testosterone and ethinyloestradiol on the synthesis and uptake of noradrenaline and 5-hydroxytryptamine in rat hindbrain: evidence for a presynaptic regulation of monoamine synthesis?
(18) The inhibitory selectivity of vardenafil on bovine and human recombinant phosphodiesterase isoenzymes
(19) Nitric oxide inhibits [3H]dopamine uptake
(20) Effect of Nitroprusside (Nitric Oxide) on Endogenous Dopamine Release from Rat Striatal Slices
(21) Hypogonadism and erectile dysfunction: the role for testosterone therapy
(22) Test results of neurotransmitters, hormones, etc.