Articles tagged with Testosterone
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.
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.
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.
A consensus statement from The Endocrine Society and the US Centers for Disease Control and Prevention calls for improved testosterone testing standards. The recommendations aim to increase accuracy, reliability, and comparability of measurements over time.
A study by Saint Louis University scientist John E. Morley found that low testosterone levels are associated with an increased risk of developing Alzheimer's disease in older Chinese men. The study, which analyzed data from 153 participants, also revealed elevated ApoE 4 protein levels and high blood pressure as additional risk factors.
A new Northwestern University study found that rapid weight gain in the first six months of life predicts earlier puberty for boys and has long-term effects on their physical characteristics and reproductive strategy. The researchers suggest that testosterone plays a key role in shaping these differences.
A recent study published in Psychological Science found that females with a male co-twin score higher on mental rotation tasks than those with a female co-twin. The study suggests that prenatal masculinization may play a role in this skill, which is often associated with testosterone levels.
A recent study published in the INFORMS journal Management Science found that young, male CEOs with higher levels of testosterone are more likely to initiate, scrap, or resist mergers and acquisitions. This is due to testosterone's association with male dominance-seeking in competitive situations.
A large population study found a statistically significant association between BPA exposure and increased testosterone levels in men. The study, which analyzed data from over 700 adults aged 20-74 years, suggests that even low-level exposure to BPA may have endocrine-disrupting effects on human health.
A large US multicenter study suggests that older men with higher testosterone levels are more likely to have a heart attack or other cardiovascular disease. Higher total testosterone levels relate to an increased risk of coronary disease, particularly in those above 495 ng/dL.
A new study reveals differing hormone levels in humans, bonobos, and chimpanzees before competition. Males who are intolerant of sharing food showed hormonal changes similar to chimpanzees, while those who tolerated cooperation showed cortisol increases like bonobos.
A new study conducted in animals found that early life exposure to BPA may cause long-lasting harm to testicular function. The study showed that even low levels of BPA exposure during critical developmental periods can lead to decreased testosterone secretion in male offspring.
A study identified nine key symptoms associated with late-onset hypogonadism, including decreased sexual function and energy levels. The researchers found that testosterone treatment may only be useful in a small number of cases, highlighting the need for clear diagnosis criteria.
A study by Max-Planck-Gesellschaft researchers found that House sparrow males' bill color is correlated with their testosterone levels, while the size of their badge has no such correlation. This suggests that the badge may be an honest signal of a male's quality rather than his dominance status.
A new investigation reveals that anger provokes profound changes in the state of mind of individuals, as well as psychobiological parameters. Heart rate, arterial tension, and testosterone increase, but cortisol levels decrease. The study also highlights the complexity of emotions, with anger exhibiting unique patterns.
A new study published in Springer's journal Behavioral Ecology and Sociobiology found that men perceive vocal masculinity as a strong indicator of dominance, but it does not influence their attentiveness to rivals' voices. The researchers also discovered that testosterone levels are linked to dominance ratings.
A field study found that intermediate testosterone production is associated with increased survival and reproductive success in male dark-eyed juncos. The researchers also discovered that high and low testosterone levels lead to decreased survival rates, contradicting previous expectations.
A study published in Diabetes Care reveals that 40% of obese participants had lower-than-normal testosterone readings, with a significant decrease in testosterone levels as BMI increased. Obesity and diabetes may exert independent influences on testosterone concentrations.
A new study examines the safety and tolerance of SE5-OH containing Natural S-equol in healthy adult Japanese men, with results showing normal hormone levels and PSA levels. The supplement appears to be well-tolerated, but further studies are needed to confirm its effects on prostate health.
A study in Social Psychological and Personality Science found that young men took greater physical risks and had higher testosterone levels when attempting tricks in front of an attractive female. This suggests that the presence of a beautiful woman can lead to increased risk-taking behavior and elevated testosterone levels in men.
A new study by University of California, Berkeley biologists found that pesticide atrazine can turn three-quarters of adult male frogs into females, leading to a significant decline in reproduction. The study also showed that the altered sex ratios can have devastating effects on frog populations.
A new study found that testosterone deficiency after chemotherapy or radiation therapy affects male cancer survivors' quality of life and energy levels. Young male cancer survivors with low testosterone may benefit from replacement therapy.
A new study published in Psychological Science found that men's testosterone levels increase when exposed to scents from women who are ovulating. The research suggests that this response may promote mating-related behavior in males. This study provides direct evidence of the influence of olfactory cues on male biological responses.
A study published in Nature found that testosterone actually encourages fair behaviors if it serves to ensure one's own status. The hormone increases sensitivity for status, leading to pro-social behavior in humans, rather than aggression. This challenges the long-held assumption that testosterone causes aggressive behavior.
A study by John Coates and Lionel Page found that experienced traders outperform the market with a high Sharpe Ratio, indicating prudent risk-taking. The researchers also discovered that profit-sharing incentives encourage traders to lower risk variance.
A large national study on testosterone's effectiveness will be conducted at LA BioMed, focusing on its impact on anemia, cardiovascular disease, and other health conditions in older men with low testosterone levels. The Testosterone Trial will involve 800 men across 12 sites, including LA BioMed, to evaluate the treatment's benefits.
A new study found that postmenopausal women with higher testosterone levels are three times as likely to have coronary heart disease and the metabolic syndrome compared to those with lower testosterone levels. Insulin resistance is also more common in these women.
A study by researchers at Duke University and the University of Michigan found that men who voted for McCain or Barr experienced a significant drop in testosterone levels after the election results were announced. In contrast, Obama voters showed stable testosterone levels. The study suggests that vicarious participation in elections c...
A new study in mice reveals that early estrogen exposure 'masculinizes' the brain circuitry, leading to aggressive and territorial behaviors typically observed in males. The researchers found that female mice exposed to estrogen as pups exhibit similar behaviors, suggesting a critical role for estrogen in shaping masculine behavior.
Recent studies by Indiana University researcher Virginia J. Vitzthum found that living conditions, particularly economic activities and food supply, can more than double early pregnancy loss rates in rural Bolivian women. Environmental factors also play a major role in reproductive fitness for men.
Research finds that higher levels of testosterone in women are associated with a greater appetite for risk, leading to more risk-prone career choices. In contrast, men with similar testosterone levels exhibit lower risk aversion.
Visceral fat accumulation during menopause is strongly linked to increasing testosterone levels, according to a study published in Obesity. The research found that bioavailable testosterone was the strongest predictor of visceral fat, with estradiol levels bearing little relationship to the amount of visceral fat.
Sexual medicine experts focus on treating causes of sexual dysfunction beyond physical issues, exploring relationship dynamics and hormonal imbalance. New treatments and options for women and men are being developed to address complex sexual health needs.
A new study published in The Endocrine Society's Journal of Clinical Endocrinology & Metabolism found that injecting testosterone undecanoate monthly can effectively prevent pregnancy. After thirty months, the cumulative contraceptive failure rate was 1.1 per 100 men.
Current testosterone doping tests may fail to detect steroid abuse in athletes of different ethnicities due to varying hormone metabolism. Researchers suggest recalibrating thresholds for each ethnic group to address this issue.
A new testosterone patch designed to boost female sex drive after menopause has been found ineffective, with small improvements and large placebo responses reported in clinical trials. The treatment's long-term safety is also unknown due to short trial duration and high side effect rates.
A new prostate cancer drug, degarelix, has been shown to dramatically reduce testosterone levels in patients as early as three days after treatment. Compared to other treatments, degarelix also resulted in faster declines in prostate-specific antigen (PSA) levels and fewer side effects such as urinary tract infections and joint pains.
A new study from Indiana University's Kinsey Institute explores the link between hormone levels and brain responses to masculinized versus feminized male faces. The research found that neural activation in response to face stimuli is sensitive to facial masculinization, with differences appearing strongest during the follicular phase c...
A study published in the New England Journal of Medicine found that testosterone administered by a skin patch improves sexual well-being in post-menopausal women. The research involved over 800 participants from across the globe and suggests testosterone as a potential treatment for low libido in this demographic.
Researchers discovered a significant genetic link between male to female transsexuals and a longer version of the androgen receptor (AR) gene, which modifies testosterone action. This study provides evidence for a biological basis of how gender identity develops.
A new study led by Anna Dreber and Coren Apicella found that men with higher testosterone levels invest more in risky investments. The researchers discovered a correlation between testosterone levels and financial risk-taking behavior, which may be linked to evolutionary factors.
A study by the Endocrine Society suggests prenatal testosterone excess may contribute to low sperm counts and reduced fertility in males. Researchers found that exposure to high levels of testosterone during fetal development can negatively impact male reproductive health.
A study published in Diabetes Care found that young men with type-2 diabetes have significantly lower levels of testosterone, which can impact fertility, muscle development, and increase the risk of heart disease. The study also highlights the potential clinical implications of low testosterone in these individuals.
Research suggests that increased testosterone in male mice increases their ability to transmit diseases, driving transmission through close social contact. The study found that treated mice made significantly more contacts with both males and females than untreated mice, leading to a higher risk of disease spread.
A new study found that testosterone predominance during menopause is associated with a higher prevalence of metabolic syndrome, which increases the risk of cardiovascular disease. The study suggests that testosterone may play a more significant role in cardiovascular risk than previously thought.
A new mass spectrometry test can detect naturally occurring steroid levels in athletes more accurately than previous tests. The test is faster to perform and can be run on standard laboratory equipment, making it easier to detect doping violations.