Articles tagged with Testosterone
Researchers found that bisphenol A reduces testosterone production and causes testicular hormone imbalances in human fetal testicles. The study suggests a link between BPA exposure and reproductive issues, including low sperm count and increased risk of testicular cancer.
A new study finds that men and women with smaller finger ratios self-reported higher levels of verbal aggression. The research suggests that prenatal testosterone may play a role in the development of verbal aggression, providing new insights for therapists and communication scientists.
Two new clinical practice guidelines from six organizations address testing for patients with stable ischemic heart disease (IHD), recommending thorough history and physical examination prior to additional testing. A separate study found that adding testosterone to sildenafil therapy does not improve erectile function in men with low t...
Researchers at Max Planck Institute for Ornithology discovered that testosterone regulates solo song in African white-browed sparrow weavers. In females, testosterone treatment induced male-typical solo song development. The study highlights a complex relationship between hormone concentration and song behavior in tropical birds.
Researchers found that men whose testosterone fell following radiation therapy were more likely to experience an increase in prostate-specific antigen (PSA), often indicating cancer recurrence. This discovery may lead doctors to use testosterone levels as a guide for treatment decisions.
A University at Buffalo study found that obese teenage males have up to 50% less total testosterone than their lean peers, increasing their potential for infertility as adults. The researchers believe that lifestyle changes and weight loss may help restore testosterone levels in obese teen males.
Researchers found that daily exercise improves nerve regeneration in both males and females, requiring androgens like testosterone. The study's results provide a basis for developing future treatments tailored to men and women's needs.
Researchers found that testosterone-treated subjects lied less frequently than placebo-treated subjects in a dice game experiment. This result challenges the common perception of testosterone as promoting aggressive behavior and suggests that it may increase pride and the need for self-image.
A study of 362 fathers in the Philippines found that close sleeping proximity was associated with greater decreases in testosterone levels as men transitioned to fatherhood. This is linked to lower overall testosterone levels compared to fathers who slept apart from their children, suggesting a potential impact on parenting behavior.
A low-protein diet during pregnancy may increase the risk of hypertension in children. Research suggests that reduced activity of an enzyme called Hsd17b2 allows more testosterone to reach the fetus, leading to increased susceptibility to adulthood hypertension.
Researchers identified genetic markers influencing protein levels regulating oestrogen and testosterone in the bloodstream, near genes related to liver function and type 2 diabetes. These findings highlight an important connection between metabolic and reproductive systems in men and women.
A new study finds that testosterone-replacement therapy significantly improved symptoms of metabolic syndrome associated with testosterone deficiency in men. Symptoms improved across all three components of obesity, including waist circumference, weight, and body-mass index.
A new study presents a promising reversible male contraceptive method using a combination of testosterone and Nestorone gels. The study found that 88-89% of men using the gel experienced very low sperm counts, and complete absence of sperm occurred in significantly more men compared to those using testosterone alone.
A new study found that weight loss reduced the prevalence of low testosterone levels in overweight, middle-aged men with prediabetes by almost 50 percent. The study involved nearly 900 men and showed that lifestyle modification, rather than medication, can increase testosterone production.
A new experimental medication called enobosarm safely increases muscle strength and physical functioning among cancer patients with low testosterone levels. In a multi-center trial, enobosarm significantly improved physical function by 19% in men with low testosterone and by 13% in those with normal hormone levels.
A new study found that long-term testosterone treatment resulted in significant weight loss, with an average of 36 pounds lost over two years. Men also experienced a reduction in waist size, shedding nearly 3.5 inches around their midsection.
A new study found that declining testosterone levels in men are more likely caused by smoking behavior, obesity, and depression than aging. The study of over 1,500 men aged 35-80 showed that testosterone levels decreased less than 1% each year.
New research from McMaster University debunks the bodybuilding myth that growth-promoting hormones stimulate strength after weightlifting. Contrary to conventional wisdom, anabolic hormones do not influence muscle protein synthesis, leading to bigger muscles.
The proposal to test female athletes' testosterone levels for competition eligibility raises concerns about fairness, discrimination, and the reliability of such tests. Stanford scientists argue that there is insufficient evidence to set a benchmark for normal testosterone levels in elite female athletes.
Researchers found strong relationships between aggressive behavior and individual variation in genes related to testosterone processing in the brain. The study suggests that selection can shape aggression through changes in gene expression, independent of circulating testosterone levels.
A study by Adam Galinsky et al. suggests that team hierarchies improve efficiency and productivity due to reduced conflict and increased coordination. The research confirms the theory that all high-power individuals lead to elevated conflict, undermining group performance.
Research with twin infants suggests that environmental factors, including maternal diet and interactions, play a significant role in determining testosterone levels. The study found that genetic factors do not significantly contribute to testosterone levels in infancy.
A recent study from the University of Edinburgh found that low testosterone levels in men can increase their risk of developing diabetes. The research discovered that testosterone plays a crucial role in regulating insulin sensitivity, and its impairment is linked to insulin resistance.
A study published in PLOS ONE found that soccer fans' testosterone and cortisol levels rise when watching a game, regardless of age, gender, or interest level. However, cortisol levels only increased for dedicated young male fans who perceived a strong threat to their social esteem if their team didn't win.
Researchers found that testosterone supplements improved a six-minute walking test score by 50% compared to placebo, with gains lasting for at least one year. In addition, severity of heart failure improved in 35% of treated patients, compared to 9.8% of those on placebo.
A University of Colorado Cancer Center study found that men taking crizotinib for lung cancer experience a significant drop in testosterone levels, which can lead to fatigue, low bone density, and decreased sex drive. Regular monitoring and treatment of testosterone deficiency can improve patients' overall quality of life.
A new study in Biological Psychiatry has discovered that testosterone's antidepressant properties are mediated by a specific pathway in the hippocampus. Testosterone replacement therapy has been shown to effectively improve mood, particularly in men with hypogonadism.
Research shows that Tsimane men have lower baseline testosterone levels compared to US men, but exhibit similar short-term spikes in response to competition. This finding suggests a unique adaptation to their environment, where parasites and pathogens are more prevalent.
The study found that the conversion of testosterone to DHT is not necessary for its effects on muscle mass, strength, and other body functions. The findings suggest that 5α-reductase inhibitors may be safe for men with normal or high testosterone levels, but measurement of testosterone levels may be useful to identify those less likely...
A UCSF team has identified genes that influence male and female behaviors, such as sex drive and nurturing behavior, which can be manipulated individually. The study suggests complex behaviors like autism may be broken down into component parts to better understand and treat disorders.
Research from the Wellcome Trust Centre for Neuroimaging found that testosterone makes people act less cooperatively and more egocentrically in groups. The study used female volunteers who received either a testosterone or placebo supplement, and found that cooperation was reduced when given testosterone.
Male infants exposed to high levels of prenatal testosterone are twice as likely to experience language delays compared to females. The study found that higher levels of prenatal testosterone increased the likelihood of language development delays in males.
Researchers at Max Planck Institute found that high-ranking male bonobos were more aggressive and had higher mating success, but also invested in friendly relationships with females. These relationships correlated with lower male testosterone levels, challenging the common notion of masculine behavior.
A recent study published in the Journal of Clinical Endocrinology & Metabolism found that higher levels of testosterone were associated with reduced loss of lean muscle mass in older men. Higher testosterone levels were also linked to less loss of lower body strength, particularly in those who were losing weight.
Researchers found a strong relationship between testosterone levels and the size/intensity of the black throat patch in female barred buttonquails. High testosterone levels correlate with more intense plumage coloration and better body condition, suggesting a reversed hormone dependency in sex role behaviors.
A large study led by Stanford urologist Michael Eisenberg found that childless men are more likely to die from cardiovascular disease than fathers. The study tracked over 135,000 male members and found a 17% increase in mortality risk among childless men compared to fathers.
A new Northwestern University study confirms that human males are biologically wired to care for their offspring, showing that fatherhood significantly lowers testosterone levels. The study found that fathers who became more involved in child care experienced the largest decline in testosterone.
Biologists found that male and female digit proportions are determined by the balance of sex hormones during early embryonic development. The study provides a genetic explanation for links between finger proportions and traits such as sperm counts, aggression, and health problems like autism and breast cancer.
Men are less susceptible to inflammatory diseases due to higher testosterone levels, which suppress phospholipase D and reduce pro-inflammatory substance production. This knowledge can inform new therapies for inflammatory diseases, requiring 'customized' treatments for men and women.
Research by NewYork-Presbyterian/Weill Cornell Medical Center reveals varicoceles cause lower testosterone levels in men. Microsurgery significantly increases testosterone levels in patients with varicoceles.
A new study published by The Endocrine Society finds that testosterone levels do not decline with age in healthy older men. In fact, serum testosterone levels remained stable across the board, indicating that age is not a contributing factor to declining testosterone levels.
A new study suggests that daily testosterone therapy can improve verbal learning and memory in postmenopausal women, reducing their risk of cognitive decline. The research found significant benefits after six months of treatment.
A new study finds daily BPA exposure lowers male fertility in mice, causing reduced sperm counts and testosterone levels. Mice exposed to twice the recommended safe dose showed structural defects in their testicles and were considered subfertile.
A study of 75 obese men found that bariatric surgery can reverse low testosterone levels and symptoms of male sexual dysfunction. After weight loss, testosterone levels increased significantly, indicating a potential causal relationship between obesity and low testosterone.
A study published in JAMA found that sleep loss of just five hours a night can lower testosterone levels by 10% to 15%, similar to aging 10-15 years. This significant decline is linked to reduced sense of well-being, mood, and vigor.
Research suggests that cell phone use can lead to increased testosterone levels but decreased fertility due to altered hormone balances.
A new study published in The Journal of Urology found that testosterone therapy does not cause rapid growth of prostate cancer in men with untreated or low-risk prostate cancer. Testosterone treatment was associated with improved symptoms and quality of life, without increasing the risk of cancer progression.
A study by Richard Slatcher found that testosterone levels are associated with men's dominance behaviors and success when competing for an attractive woman. Men with high testosterone levels and a strong desire for social dominance were more likely to suppress their competitors' ability to attract the woman.
Research from North Carolina State University found that closely contested games result in a significant increase in traffic fatalities, with nail-biter games being the most dangerous. The study, published in Journal of Consumer Research, suggests that competition-induced testosterone may play a role in this increased risk.
Researchers found that osteocalcin enhances testosterone production, leading to improved sperm count and reproductive success in male mice. The study suggests that low osteocalcin levels may contribute to male infertility in humans.
Researchers found a gene called RORA that plays a critical role in brain development and is affected by sex hormones. In individuals with autism, aromatase conversion of testosterone to estrogen is reduced, leading to increased male hormone levels and decreased RORA expression.
A new study from University of Cambridge found that testosterone administration negatively affects women's ability to mind read, an indication of empathy. The effects are predicted by a fetal marker of prenatal testosterone, the 2D:4D ratio.
Research finds that dominant animals in primate societies have higher parasite loads due to suppressed immune systems. Frequent aggression and contact with other animals may contribute to the risk of infection.
A study by U of A Psychology researcher Peter Hurd found that less sensitive genes were associated with more aggressive behaviour, suggesting a possible link between fetal testosterone exposure and adult social behavior. The researchers also discovered subtle forms of aggression, such as indirect aggression through gossip-like behaviors.
Declining sperm counts and testosterone levels are contributing to reduced fertility rates worldwide. At least one in five young men in Europe have subfertile semen quality, while testicular cancer and developmental abnormalities also rise. Poor sperm quality is linked to poorer IVF success rates.
Researchers at Concordia University discovered a link between the length of the second and fourth fingers and risk-taking behavior in men. The study found that alpha males with shorter ratios were more likely to engage in recreational, social, and financial risk-taking.
A new study published in Molecular Pain found that a single injection of morphine can strongly reduce testosterone levels in the brain and plasma of male rats. The study's findings are particularly important as testosterone is essential for various bodily functions, including cognitive functions and bone structure remodeling.
A study found that testosterone treatment improved muscle mass, strength, and quality of life in frail elderly men, but these effects were not maintained six months after treatment. Researchers suggest a multi-disciplinary approach, including resistance exercise and lifestyle options, to interrupt the downward spiral into frailty.
Research published in Heart found that men with low testosterone levels were more likely to die prematurely from heart disease and all causes. The study of 930 men with coronary artery heart disease showed that those with low testosterone had nearly twice the risk of death compared to those with normal levels.
Researchers found that higher estrogen levels are associated with improved blood-pumping efficiency in women on hormone therapy, while testosterone and DHEA increase RV mass in men. These findings may help explain the paradox of better survival in women with PAH.