Health24.com | Shocking prevalence of pregnancies, HIV infections in 9-19 year olds in Limpopo village

Newly released statistics from rural clinics outside of Thohoyandou show that children as young as nine are falling pregnant or acquiring HIV infections.

This was revealed by Health MEC Dr Phophi Ramathuba as she commented on the spiralling HIV infections and teenage pregnancies in rural schools in Dididi village, saying the country is being taken backward in its fight for an HIV-free generation.

Ramathuba recently held a teenage pregnancy awareness campaign in the area, after the shocking statistics were released.

According to the Department of Health, Mukhwantheli Secondary School in Dididi village has a record number of 36 pregnant learners.

Another 31 learners aged between nine and 19 from both primary and secondary schools in the same area have been infected with HIV, putting a strain on the department’s fight against the spread of HIV among the youth. 

“We are worried as a department when learners between nine and 14 are being found to be HIV positive and both their parents are negative. It tells us that most children in this age group could be involved in sexual activities,” said Ramathuba.

“Life is about choices and if you choose to engage in early sexual activity you will regret it when you grow older. Why should you break your virginity in the bushes when you can read books and be educated and successful in life to a point where you can choose any hotel in the world where you can then engage yourself in sexual activity as an adult?”

Ramathuba also reminded people not to be fooled by fake prophets who tell them they are cured of HIV and should stop taking their ARVs.

She said the high rate of alcohol consumption and lack of extra mural activities after school have been identified by the community as the driving forces behind the high rate of teenage pregnancies and the HIV infection rate.

Ndamulelo Liphadzi (23), a grade 12 learner at Mukhwantheli Secondary and mother of a three-month-old son, said she regrets not listening to the elders when they warned her about boys and engaging herself in early sexual intercourse. She now struggles to raise her son and keep up with her studies.

“I wish I had listened. I am now learning the hard way that raising a child is not an easy job, especially when you’re still at school. My message to others is to abstain from sexual activities so that you don’t end up having to do what I am doing at the moment.

“It is hard to focus on your studies while your child is crying and needs your attention,” she said.

-Halth-e News.

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A new way to measure nearly nothing

Many semiconductor fabricators and research labs are under increasing pressure from, of all things, vacuum. These facilities need to remove greater amounts of gas molecules and particles from their setups as new technologies and processes demand lower and lower pressures. For example, the vacuum chambers in which microchip manufacturers lay down a series of ultrathin layers of chemicals step by step — a process that must be utterly free of contaminants — operate at about one hundred-billionth of the air pressure at sea level. Some applications need pressures at least a thousand times lower than that, approaching the even more rarefied environments of the Moon and outer space.

Measuring and controlling vacuum at those levels is an exacting business in which accuracy is essential. Current technology usually relies on a device called an ion gauge. However, ion gauges require periodic recalibration and are not compatible with the new worldwide effort to base the International System of Units (SI) on fundamental, invariant constants and quantum phenomena.

Now NIST scientists have designed a vacuum gauge that is small enough to deploy in commonly used vacuum chambers. It also meets Quantum SI criteria, meaning it requires no calibration, depends on fundamental constants of nature, reports the correct quantity or none at all, and has specified uncertainties that are suitable for its application. The new gauge tracks changes in the number of cold lithium atoms trapped by a laser and magnetic fields within the vacuum. The trapped atoms fluoresce as a result of the laser light.

Every time a cold atom is struck by one of the few molecules moving around in the vacuum chamber, the collision kicks the lithium atom out of the trap, decreasing the amount of fluorescent light emitted. A camera records the dimming. The faster the light dims, the more molecules are in the vacuum chamber, making the fluorescence level a sensitive measure of pressure.

The new portable system is the result of a NIST project to create a tabletop cold-atom vacuum standard (CAVS) that will be used to make measurements of fundamental atomic properties. While CAVS is too large for, and unsuited to, use outside the laboratory, the portable version, or p-CAVS, is designed to be a “drop-in” substitute for existing vacuum gauges.

“Nobody has thought about how to miniaturize such a cold-atom vacuum gauge and what kinds of uncertainties it would entail,” said Stephen Eckel, one of the project scientists who in September described their design in the journal Metrologia. “We are in the process of developing such a system that could potentially replace sensors now on the market, as well as figuring out how to operate and evaluate it.” Individual components are being tested, and a working prototype is expected in the nearfuture.

The NIST design uses a newly developed variation on a staple technology of atomic physics: the magneto-optical trap (MOT). In a typical MOT, there are six laser beams — two opposing beams on each of three axes. Atoms placed in the trap are slowed when they absorb momentum from laser photons of exactly the right amount of energy, damping the atoms’ motion. To confine them in the desired location, the MOT contains a varying magnetic field, the strength of which is zero at the center and increases with distance outward. Atoms in higher-field areas are more susceptible to laser photons and are thus pushed inward.

NIST’s portable gauge uses only a single laser beam directed onto an optical component known as a diffraction grating, which splits the light into multiple beams coming from various angles. “Putting in laser beams from six different directions makes the experiment really big and needs a lot of optics,” said Daniel Barker, another NIST project scientist. “Now you only need one laser beam that comes in and hits a diffraction grating. When the light is diffracted you get the other beams that you need to close the MOT and make the trap.”

At that point, the atoms are only a few thousandths of a degree above absolute zero. They are struck by ambient molecules, principally hydrogen — the dominant gas that remains after the vacuum chambers are baked and then pumped down to ultrahigh (UHV) or extreme-high vacuum (XHV). The UHV range includes the vacuum level around the International Space Station; XHV includes the even lower pressure levels above the Moon.

The use of lithium is another scientific innovation in the NIST design. Lithium is the third-lightest element and belongs to the group of alkali metals — including sodium, potassium, rubidium and cesium — which are comparatively easy to cool and trap. “Nobody to our knowledge has been thinking about a single-beam MOT for lithium,” Barker said. “Lots of people think about rubidium and cesium, but not too many about lithium. Yet it turns out that lithium is a much better sensor for vacuum.”

Among the advantages: The interaction dynamics between lithium atoms and hydrogen molecules can be calculated exactly from first principles. “That allows us to make a primary gauge that you don’t need to calibrate,” Eckel said. “Moreover, lithium has an extraordinarily low vapor pressure at room temperature (meaning it has a low tendency to change into a gaseous state). So, typically, the atom will make a single pass through the MOT region and if it is not trapped it will hit a wall and stay there forever. With rubidium or cesium, which have relative high vapor pressures at room temperature, eventually you will coat the walls of the vacuum chamber with enough rubidium or cesium metal that the coatings will start emitting atoms.

“In addition, lithium’s vapor pressure also remains low at 150 degrees Celsius, where people generally bake UHV and XHV chambers to remove water coatings on the stainless steel components. In that sense, you can still prepare the vacuum chamber through standard techniques, even with this gauge attached.”

UHV and XHV environments “are a critical part of the infrastructure in advanced manufacturing and research, from gravitational-wave detectors to quantum information science,” said James Fedchak, who oversees the project. “CAVS will be the first absolute sensor created that operates in this pressure regime. At present, engineers and scientists often use the experiment or process itself to determine the vacuum level, which is often a destructive test.”

“p-CAVS will enable researchers and manufacturers to accurately determine the vacuum level before the experiment or process begins,” said Fedchak. “It will also allow lower levels of vacuum to be accurately measured — levels which are becoming more and more important in areas such as quantum information science.”

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Genomic evidence of rapid adaptation of invasive Burmese pythons in Florida

Florida has become a haven for invasive species in the United States, but perhaps the most well-known of the State’s alien residents is the Burmese python. These giant snakes, native to Southeast Asia, have become well-established over the past few decades and even flourish in their new environment.

“In Burmese pythons, we observed the rapid establishment and expansion of an invasive population in Florida, which is quite ecologically distinct from Southeast Asia and likely imposes significant ecological selection on the invasive Burmese python population,” said Todd Castoe, biology professor at the University of Texas at Arlington and director of the Castoe Lab. “This situation had all of the hallmarks of a system where rapid adaptation could occur, so we were excited to test for this possibility using cutting-edge genomic approaches.”

The researchers originally set out to determine whether pythons could have adapted to an extreme Florida freeze event in 2010. They generated data for dozens of samples before and after the freeze event. By scanning regions of the Burmese python genome, they identified parts of the genome that changed significantly between the two time periods, providing clear evidence of evolution occurring over a very short time scale in this population.

“The 2010 Florida freeze event led to a 40 percent to 90 percent documented field mortality in invasive Burmese pythons, so if evolution and adaptation were to be occurring, we knew we should see it over this time period that imposed a very strong bottleneck of selection,” Castoe said.

“We employed a technique commonly referred to as a genome scan, which identifies regions of the genome that appear to be under strong natural selection, which could contain genes important in adaptation that may have allowed a subset of this population to survive these freeze events,” he added.

The researchers expected to find genes in these regions that are important for potential adaptation to cold, but as they further scrutinized the data, a different signal began to emerge that told a more broad story about adaptation in this invasive population.

“We kept seeing evidence of adaptation in genes related to cell division, organ growth, and tissue development, which admittedly puzzled us at first. However, it eventually occurred to us that there was a connection with a parallel project in the lab that uses Burmese pythons as a model system for understanding regenerative organ growth, where tissues are downregulated when fasting and then regenerated in cyclical patterns corresponding with feeding cycles of most pythons. We began to wonder whether the signal we were seeing in the genome of Florida Burmese pythons was linked to adaptation in how they regenerated organ systems based on their feeding ecology,” said Daren Card, a recently graduated Ph.D. student in the Castoe lab who worked on this project for his dissertation.

Armed with a working hypothesis that invasive Burmese pythons may be adapting to more regular feeding opportunity in Florida, the researchers gathered further ecological, functional genomic, and morphological data to understand the frequency at which pythons are feeding and whether there are physiological changes consistent with more regular feeding.

“These additional analyses showed that Burmese pythons in Florida are constantly feeding and that tissue morphological and gene expression patterns support a more up-regulated physiological state in fasted pythons — Florida pythons appear to have adapted to regulating their digestive physiology to more efficiently eat prey constantly. This is alarming because these snakes have already been shown to have major negative impacts on endemic mammalian and bird populations in South Florida, including Everglades National Park, and our data was suggesting that, through rapid adaptation, they are only ‘getting better’ at being an effective invasive predator,” Card added.

UTA biology chair Clay Clark congratulated the team on this work, which provides tangible evidence that evolution can occur extremely rapidly in natural populations, and that such rapid evolution can result in major changes in very complex traits that impact the physiology and ecology of vertebrates.

“These results provide an unprecedented perspective at how quickly a vertebrate population can evolve, while also providing new links between genomic adaptation and complex physiological change related to the ecological impacts of invasive species,” Clark said. “It is particularly important work given UTA’s strategic focus on global environmental impact.”

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Health24.com | How does circumcision really affect your sex life? Here are the facts

When Adam Zeldis was 16, Howard Stern changed his mind about his penis forever. On his show, Stern was talking about how circumcision changes sexual sensations for men, and Zeldis’s curiosity was piqued. He had been circumcised as a baby, and he hadn’t ever thought about whether it had reduced sexual sensation for him before. In fact, up to that point, he had no idea that there were even men who weren’t circumcised.

So Zeldis decided to do some research. And when he learnt what a circumcision procedure actually entailed – the surgical removal of the foreskin of the tip of the penis – he was outraged.

“I felt a loss for a sex life that I could never have,” Zeldis told Men’s Health. “Basically, if you’re circumcised you can never experience sex the way nature intended it.”

Today, Zeldis is a senior strategy advisor for Intact America, an activist organisation designed to educate people against circumcision, which it views as a medically unnecessary and cruel practice. Intact America isn’t the only organisation that harbours this view: In fact, there is an entire movement – “Intactivism” – devoted to propagating the idea that male circumcision is a cruel and barbaric practice.

But what are the cold, hard facts about circumcision? Are there actually health benefits, or is it a cruel, outdated practice that permanently reduces male sexual sensation? We asked doctors and sexuality experts to weigh in.

Does circumcision have health benefits?

For decades, circumcision has been something of a given in the United States. It was considered a standard procedure for baby boys, regardless of their cultural or religious background, with doctors citing its health and hygiene benefits. For this reason, approximately 75% of men in the United States are circumcised, according to the World Health Organization.

Read more: Sex tips: What to do when she’s on top

The potential health benefits aside, “parents who choose circumcision often do so based on religious beliefs, common myths about hygiene, or cultural or social reasons, such as the wish to have their child resemble his father,” says sex therapist Kimberly Jackson, LCSW.

Doctors also believed circumcision cut down on the risk of sexually transmitted infections (STIs) and urinary tract infections (UTIs), which, if left untreated, can lead to kidney infections.

“The cited health benefits included [a decreased risk of] STIs, especially HIV and HPV; penile cancer; paraphimosis (when foreskin gets trapped behind the glans, which can cut off blood supply to the tip of the penis) and balanitis, or infection of the glans,” says sexual health counsellor Aleece Fosnight, MSPAS, PA-C, CSC, CSE.

Are the benefits of circumcision legit?

To a degree, the consensus in the medical community is still that circumcision does slightly reduce the risks of certain UTIs and STIs. In 2012, the American Academy of Paediatrics issued a statement saying that notwithstanding the potential rare complications of circumcision, including bleeding, infection and (shudder) penile necrosis, “the health benefits of newborn male circumcision outweigh the risks”.

But over the years, emerging research has thrown some of the stated benefits of circumcision into question. For instance, while some studies of African men indicated that circumcision could reduce the risk of HIV transmission by as much as 60%, “the research design was inherently flawed – [they] only examined the health behaviours of heterosexual men, and the results cannot be generalised across cultures,” says Jackson.

Read more: If my partner is HIV positive, how can I protect myself?

That’s why more and more parents are choosing to forego the procedure. Circumcision is on something of a decline, with the number of newborns who are circumcised dropping from 84% in the 1960s to about 77% in 2010. Some doctors are also refusing to perform the procedure.

“I have not performed a circumcision since 1994,” says Dr Steven Dorfman, a paediatrician at Kaiser Permanente in San Francisco. “It is a cruel, unnecessary and… substandard practice which belongs in the history books, not in the hospital or the clinic.”

As to the question of whether circumcision is more hygienic than being uncut, it is true that guys who are uncut do have to contend with smegma, an odourless (and harmless) cheese-like substance underneath the foreskin. But washing underneath the foreskin daily and rinsing the head of the penis can easily remedy that issue.

Does being circumcised reduce sexual sensation?

For many guys, this is the million-dollar question: Does circumcision reduce penile sensitivity?

Some health experts claim that circumcision can reduce sexual sensation, as the procedure removes thousands of nerve endings in the penis. In fact, a 2007 study found that the glans of the uncircumcised penis was more sensitive to light touch than the glans of a circumcised penis.

Read more: Do you have low penis self-esteem?

“It is also thought that the extra skin adds more friction and stimulation to the clitoris during penetration (both get extra pleasure!), and causes increased sensation to the glans as well,” says Fosnight.

That said, “studies show that there is no significant change in sensation in adult men who undergo circumcision,” says Dr Alex Shteynshlyuger, director of urology at New York Urology Specialists. A 2016 study confirmed this, finding that men who were circumcised experienced the same level of sexual pleasure as men who were not.

Do people prefer uncircumcised penises?

Although the research on the health and sexual benefits of circumcision is mixed, some parents still would prefer to circumcise their kids for aesthetic reasons – i.e., because they don’t want their sons to feel weird next to the other kids in the locker room. And some guys still do think that their sexual partners prefer circumcised penises to uncircumcised ones.

But when it comes down to it, that’s probably not the case. While there are few surveys indicating what people’s preferences are, a lot of people really don’t care if their sexual partners are circumcised or not – especially as more and more parents choose not to circumcise their kids.

Read more: Your ultimate guide to lasting longer in bed

“I don’t discriminate. It doesn’t matter to me. Plus, I’m not everyone’s idea of ‘perfect’ down there, either,” says Maria*, 38. Karina*, 26, agrees: “I don’t care one way or the other so long as it’s clean and disease-free. Cut, uncut, whatever, it’s the guy that matters. Not how his penis looks.”

*Names changed to protect privacy

This article was originally published on www.mh.co.za

Image credit: iStock

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Earth’s inner core is solid, ‘J waves’ suggest

A new study by researchers at The Australian National University (ANU) could help us understand how our planet was formed.

Associate Professor Hrvoje Tkalčić and PhD Scholar Than-Son Phạm are confident they now have direct proof that Earth’s inner core is solid.

They came up with a way to detect shear waves, or “J waves” in the inner core — a type of wave which can only travel through solid objects.

“We found the inner core is indeed solid, but we also found that it’s softer than previously thought,” Associate Professor Tkalčić said.

“It turns out — if our results are correct — the inner core shares some similar elastic properties with gold and platinum. The inner core is like a time capsule, if we understand it we’ll understand how the planet was formed, and how it evolves.”

Inner core shear waves are so tiny and feeble they can’t be observed directly. In fact, detecting them has been considered the “Holy Grail” of global seismology since scientists first predicted the inner core was solid in the 1930s and 40s.

So the researchers had to come up with a creative approach.

Their so-called correlation wavefield method looks at the similarities between the signals at two receivers after a major earthquake, rather than the direct wave arrivals. A similar technique has been used by the same team to measure the thickness of the ice in Antarctica.

“We’re throwing away the first three hours of the seismogram and what we’re looking at is between three and 10 hours after a large earthquake happens. We want to get rid of the big signals,” Dr Tkalčic said.

“Using a global network of stations, we take every single receiver pair and every single large earthquake — that’s many combinations — and we measure the similarity between the seismograms. That’s called cross correlation, or the measure of similarity. From those similarities we construct a global correlogram — a sort of fingerprint of the Earth.”

The study shows these results can then be used to demonstrate the existence of J waves and infer the shear wave speed in the inner core.

While this specific information about shear waves is important, Dr Tkalčić says what this research tells us about the inner core is even more exciting.

“For instance we don’t know yet what the exact temperature of the inner core is, what the age of the inner core is, or how quickly it solidifies, but with these new advances in global seismology, we are slowly getting there.

“The understanding of the Earth’s inner core has direct consequences for the generation and maintenance of the geomagnetic field, and without that geomagnetic field there would be no life on the Earth’s surface.”

The research has been published in the journal Science.

Story Source:

Materials provided by Australian National University. Note: Content may be edited for style and length.

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Health24.com | IBS – 4 symptoms that extend beyond your stomach

Unfortunately doctors still don’t know what causes irritable bowel syndrome (IBS) – but they believe that a combination of problems can lead to the condition.

They do know, however, that functional gastrointestinal (GI) disorders, such as IBS, are problems with brain-gut interaction (i.e. how your brain and stomach work together), according to the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK).

The NIDDK says, “Experts think that problems with brain-gut interaction may affect how your body works and cause IBS symptoms. For example, in some people with IBS, food may move too slowly or too quickly through the digestive tract, causing changes in bowel movements. Some people with IBS may feel pain when there’s a normal amount of gas or stool in the gut.”

Although common symptoms of IBS affect the stomach and digestive system, there are other symptoms that don’t. Here are four:

1. Headaches

According to Dr Bethany DeVito, a gastroenterologist at North Shore University Hospital in Manhasset, New York, it’s common for IBS patients to report symptoms unrelated to digestion. She says there is an established connection between IBS and migraines in the medical community.  

For example, a 2005 study published in the Polish Journal of Neurology and Neurosurgery found that 23 to 53% of people with IBS suffer from frequent headaches, while 10 to 20% experience migraine headaches and IBS.

Another study, published in BMC Gastroenterology, says that people with IBS are 40 to 80% more likely to suffer from migraines, fibromyalgia and/or depression than those who don’t have IBS.

A 2012 study published in Current Pain and Headache Reports reports a further connection between migraine headaches, IBS and coeliac disease (hypersensitivity to gluten).

Some patients find that symptoms of IBS and migraines occur simultaneously. “During the migraine attacks, some patients also have associated gastrointestinal disturbances, such as nausea, vomiting, abdominal pain and diarrhoea,” Dr DeVito said. Other patients report that IBS symptoms occur between headache attacks.

Stress is one factor that can cause both symptoms. “This mind-body connection is real and can greatly influence health,” said Dr Maxwell Chait, gastroenterologist at Columbia Doctors Medical Group in Hartsdale, New York. Serotonin is another: “Serotonin is a major neurotransmitter of the gastrointestinal tract that plays a relevant part in IBS as well as migraine.”

2. Frequent urination

Researchers aren’t sure why but bowel and bladder problems overlap. Research shows that 50% of people who have IBS suffer from urinary issues, which include an overactive bladder (OAB), incomplete emptying of the bladder, getting up in the night to urinate (nocturia), and urinary urgency. Ally Marie believes that because she has IBS-C, her full bowel often puts pressure on her bladder, causing her to urinate frequently.

“Having IBS-C and not IBS-D, I don’t have to deal with sprinting to the bathroom on a plane ride for #2, but I’m that annoying person that says, ‘Excuse me!’ 10 times on a flight because I constantly have to pee! I also have very interrupted sleep because I have to get up multiple times in the night to pee (nocturia). Also, just like I never feel as if I completely finish a bowel movement, I always feel like I could pee again, right after I finish going #1.”

3. Fatigue

When you suffer from IBS, you can become fatigued when your symptoms are triggered. According to the NIDDKD, common food triggers include fatty foods, artificial sweeteners, alcohol, dairy, caffeine, beans, cabbage and other gas-causing foods.

IBS can also cause fatigue due to intestinal inflammation, which lowers levels of glutamic acid. Eva Cwynar, author of The Fatigue Solution, explains that lower glutamic acid levels mean lower levels of gamma-aminobutyric acid, or GABA, which is an agent that helps to calm the brain.

The result of low GABA levels? Exhaustion, restlessness, stress and fatigue. 

4. Anxiety and depression

People who have IBS often suffer from anxiety and depression, which can in turn worsen symptoms, says the Anxiety and Depression Association of America (ADAA). Why? Because the nervous system controls the colon, which responds to stress. According to the National Digestive Diseases Information Clearinghouse an estimated 70% of people with IBS do not receive treatment to manage their symptoms. And of those who do seek help, between 50 and 90% have a psychiatric disorder such as anxiety or depression.

The Anxiety and Depression Association of America (ADAA) says the following can help:

  • Antidepressants can minimise anxiety and depression symptoms, which in turn can help with IBS.
  • Cognitive behavioural therapy can teach you how to cope with anxiety and depression. The British Society of Gastroenterology recommends psychological therapy as the first-line treatment for IBS if you have a history of anxiety, panic attacks or depression. The American College of Gastroenterology also recommends therapy, which can reduce anxiety and IBS symptoms. 
  • The ADAA suggests practising relaxation techniques to help reduce and manage stress. 

Image credit: iStock 

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Health24.com | Do you feel sad after sex? This is why and what you can do about it

A new study published in the Journal of Sex & Marital Therapy has revealed that feeling “down” instead of “up” after sex is also commonly experienced by men, not just women. This is known as post-coital dysphoria or the “post-sex blues”.

It’s previously been found to be prevalent in women, but scientific research has not recognised it as affecting men. The study conducted by Queensland University researchers surveyed men from Australia, the UK, the US, Russia, New Zealand and Germany.

Read more: 7 surprising signs of depression that prove it’s not all about sadness

The study found that 41% of the participants had experienced post-coital dysphoria in the four weeks before doing the survey. Four percent of those said they experienced it on a regular basis. Some of the feelings the men reported were feeling emotionless and empty. “I don’t want to be touched and want to be left alone” and “I feel unsatisfied, annoyed and very fidgety. All I really want is to leave and distract myself from everything I participated in,” was also common.

Does this sound like you? We chatted to Dr Eugene Viljoen. He’s a clinical psychologist and sexologist, President of the Southern African Sexual Health Association and a worldwide lecturer and advisor. Here’s everything you need to know about post-coital dysphoria.

What exactly is post-coital dysphoria?

“After sex one might want to feel invigorated and boosted. But some people feel the opposite, being agitated, argumentative, anxious, depressed or just plainly upset after sex. This has nothing to do with the subjective feeling about the quality of consensual sex. The emotions run wild in a negative way and the person would wonder why they feel so bad (distressed) after sex, without being able to describe a single contributing factor,” said Dr Viljoen.

Read more: How to use the latest tech to have better sex and improve your relationship

What are the symptoms?

“The primary symptoms are described as feeling depressed. A negative emotional reaction follows the orgasm, without specific reasons for the depressed mood. It is possible that it may linger for a number of days after the sexual event.”

What is the cause of it?

“Although according to research studies, it seems as if more woman might suffer from this, men may also have the condition. The real reasons are not yet fully understood. But it seems as if the neurotransmitters in the area of the brain responsible for the feel good effect, do not function in the normal expected ways. Childhood sexual abuse may play a role as well in triggering negative emotions suffered during the initial trauma and bringing back old bad memories,” explains Dr Viljoen.

Read more: This will change what you think about male sexual abuse

When speaking to The Independent, co-author of the Australian study, Robert Schweitzer had this to say:

“If we are to extrapolate from what we know about Post-Coital Depression [PCD] in women, we would propose a biopsychosocial model, as there seems to be a range of factors including genetic susceptibility, possible hormonal factors and potentially, psychological factors which we do not understand at this time.”

Does it say something about my sex life or my partner?

“We don’t think it is about the relationship, but something more complex,” said the study’s co-author Joel Maczkowiack. And Dr Viljoen echoes this, “The fact that you feel like this after sex, unless you can contribute the reasons to specific factors of what makes you sad at the moment, does not have a direct link with how well you are perceived as a lover.

“The post-orgasmic blues are bigger than mere disappointment and more painful than outright embarrassment. It is a legitimate medical condition which will need medical intervention.”

Read more: Will you get superpowers if you stop masturbating?

How do I talk to my partner about it?

“Like any sexual issue, involvement of the partner is crucial. If she would see you being sad after sex, she might immediately think you find her to be a disappointment in bed, or not good enough. Even if you want to disguise the feelings, she might be able to pick up on the sadness and make her own deductions,” said Dr Viljoen.

“This might lead to conflict and making the situation worse. Talk to her about your feelings. Assure her it has nothing to do with the quality of your sexual relationship. Ask for her support and visit a sexologist who might be able to help you with the condition.”

What if my partner doesn’t understand?

Dr Viljoen says that it would be a sad affair if the partner does not want to understand the situation. “This might depend on the partners own psychological issues and emotional maturity. If the partner would not open herself to understand the condition, the relationship might be in danger due to a lack of support and understanding.”

But Maczkowiack has said post-coital dysphoria could potentially cause distress to not only the individual, but to the partner, too. This is because kissing, talking and cuddling after sex are known to boost intimacy and create a bond.

Read more: This study on older adults’ sex lives proves your sex life isn’t doomed

“The negative affective state which defines PCD has potential to cause distress to the individual, as well as the partner, disrupt important relationship processes, and contribute to distress and conflict within the relationship, and impact upon sexual and relationship functioning,” he said.

The good news? Another 2015 study on women and PCD found that there was no relationship between post-coital dysphoria and intimacy in close relationships.

What can I do about feeling sad after sex?

According to Dr Viljoen, this is not a condition that would get better after time doing nothing. “It might even get worse if you ignore the symptoms, due to developing anxiety prior to intercourse about the possible emotional feelings afterwards.

“See a sexual health specialist who would prescribe medication for the mood disorder. It would also be important to get some counselling in conjunction with the medication, as the medication in itself can produce side effects not ideal for successful intercourse.”

This article was originally published on www.mh.co.za

Image credit: iStock

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Good spatial memory? You’re likely to be good at identifying smells too

People who have better spatial memory are also better at identifying odors, according to a study published this week in Nature Communications. The study builds on a recent theory that the main reason that a sense of smell evolved was to aid in navigation, since most animals rely primarily on smell to find food and avoid predators. The McGill research team, led by Véronique Bohbot from McGill’s Department of Psychiatry and the Douglas Mental Health University Institute, hypothesized that if this were indeed the case, there would be a strong link between navigation and olfaction. The researchers were able to show, for the first time, that similar regions of the brain (the hippocampus and the medial orbitofrontal cortex) are involved in these seemingly very different activities. They also discovered that the medial orbitofrontal cortex (mOFC), which is known to be involved in olfaction, is also critical to spatial memory.

To test the correlation between spatial memory and the sense of smell, 57 participants (all young men and women) were asked to do a couple of different tasks relating to spatial memory. In one, they were given about 20 minutes to explore a virtual city, travelling down every street and passing key landmarks (schools, a pool and shops). They were then asked to find direct routes between some of the landmarks. Participants were then asked to identify 40 different smells, ranging from basil to strawberry or cinnamon.

The researchers used structural MRIs to look at various regions of the brain known to be related to olfaction and spatial memory and found that participants who were good at both spatial navigation and identifying smells tended to have a bigger right hippocampus (an area of the brain known to be involved in long-term memory) and a thicker left mOFC.

Since the mOFC, while known to be critical for olfaction, had not yet been found to be associated with spatial navigation, the researchers then confirmed their results through another experiment involving nine people with damage in this area of the brain. They found that patients with mOFC damage exhibited both olfactory and spatial memory deficits, while patients with damage elsewhere in the brain did not exhibit these deficits.

“We weren’t sure, going in, that we would find that people who were better at identifying smells would also be good at navigating,” says Louisa Dahmani, who did the research during her doctoral work at McGill, and is currently doing a post-doc at Harvard. “So the results came as a real surprise.”

Véronique Bohbot, the senior author adds: “The fact that both functions seem to rely on similar brain regions supports the idea that they were systems in the brain that were evolving at the same time — though this is theory, rather than anything we set out to show in this paper. All we can say for sure is that we now know a bit more about the brain systems involved in both navigation and olfaction.”

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Materials provided by McGill University. Note: Content may be edited for style and length.

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Invasive forage grass leads to grassland bird decline

The prairies of North America once covered vast stretches of land, with towering grasses creating ideal nesting and forage habitat for grassland birds. But the deep, rich soil and treeless expanse also represented the ideal conditions for farming — both row crops and cattle grazing — in the eyes of settlers. Today, largely thanks to agricultural conversion, a mere 1 percent of tallgrass prairie remains. And what’s left is now being threatened by invasive species and forest encroachment.

“With grasslands in steep decline, the birds that depend on them are also disappearing. Therefore, it is urgent that we understand how these more recent changes — invasive species and landscape shifts — influence grassland bird reproduction,” says Scott Maresh Nelson, a doctoral student advised by Professor Jim Miller in the Department of Natural Resources and Environmental Sciences (NRES) at the University of Illinois.

In a recent study published in Landscape Ecology, Maresh Nelson and his colleagues found that a common cattle forage grass, tall fescue, is associated with nest failure in dickcissels, small grassland birds similar to sparrows.

“Despite its name, tall fescue is actually a lot shorter than native grasses. It takes over and makes the landscape more uniform,” says Jaime Coon, also a doctoral student in Miller’s group and a co-author on the study. “Whereas the vegetation was very structurally diverse before, with some tall plants and some short, now you have a mat. It changes the vegetation structure quite a bit.”

In their Iowa-based study, the researchers identified all the plants within a 16-foot radius of every dickcissel nest they found — all 477 of them — and the more tall fescue there was, the greater the chances of nest failure. No other plant in their surveys had significant predictive power.

“We were interested that tall fescue had such strong ecological effects, in part because fescue is a very polarizing plant,” Coon says.

Her comment is based on extensive landowner surveys in the area, which revealed that while some respondents liked a high abundance of fescue, a majority would prefer less fescue on pasture land. Although it is palatable and drought tolerant, the grass hosts a fungus that can stress grazing cattle.

“The fact that fescue came out as one of the main drivers of nest failure means it might be a situation where removing an invasive grass might benefit wildlife and people’s livelihoods,” she says.

But why does fescue contribute to nest failure? The researchers point to earlier studies demonstrating that tall fescue hosts fewer insects than other types of vegetation. With less food around their nests, birds may be forced to make more feeding trips, attracting the attention of potential predators with every flight.

Fescue was also associated with nest parasitism by cowbirds, the most common avian parasite in North American grasslands. Cowbirds never build their own nests; instead, they lay their eggs in existing nests of other bird species. When a mother dickcissel finds a cowbird egg in her nest, she cares for it as one of her own, leaving fewer resources for her biological offspring. The researchers aren’t sure why fescue affected parasitism, but parasitized nests in the study had fewer dickcissel eggs, failed more frequently, and produced fewer dickcissel fledglings.

Zooming out, the researchers looked at the role of large-scale landscape changes on nest survival. They mapped the presence of row crops and forested areas near their study sites, and found that dickcissel nests near forested areas were less likely to be parasitized.

“We think the cowbirds were laying their eggs in the nests of woodland birds instead. It was surprising, because dickcissel nests are usually their favorite,” Maresh Nelson says.

Nests near row crops were slightly more at risk of failure, possibly due to greater nest predation by mammals such as raccoons that spend time near crop fields as a food source. But Maresh Nelson says that result wasn’t entirely clear. “It seems like vegetation right around the nest is more important for survival than the large-scale context.”

That ability to rank the relative importance of habitat factors influenced by human activity is one of the things that makes the study unique. And it allows the researchers to make nuanced recommendations to landowners and land managers.

“For people investing in land for conservation purposes, the landscape around the grassland may not be quite as important as what’s actually in it, in terms of nest survival. But if they have the option to invest in land near a woodland, that could reduce nest parasitism and benefit the grassland species, although that’s complicated since some predators may be more abundant near woods,” Maresh Nelson says. “It’s really important that we maximize the ability of the few remaining grasslands to provide for the species that depend on them.”

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Flu vaccine delays for NI over-65s

Manufacturing constraints mean some jabs won’t be available until late November, says chief medical officer.

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