Articles tagged with Testosterone
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 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 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 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.
A new study from Germany suggests that men with low testosterone levels are at a higher risk of dying from all causes over time. The study found that men with low testosterone had more than 2.5 times greater risk of dying in the next 10 years compared to those with normal testosterone levels, regardless of age or lifestyle factors.
Restoring normal testosterone levels in hypogonadal men leads to major improvements in metabolic syndrome features. Older men (63+) benefit equally as younger men from testosterone treatment, according to studies presented at The Endocrine Society's 90th Annual Meeting.
A new study by The Endocrine Society reveals that low testosterone may cause health problems leading to erectile dysfunction, metabolic syndrome, and cardiovascular disease. Researchers found that 18.3% of men with erectile dysfunction had undetected testosterone deficiency.
A new study by The Endocrine Society found that overweight men are not more likely to be infertile, contradicting previous research on obese women. Greater body weight was linked to lower testosterone levels in some participants, but impaired sperm production remains the primary cause of infertility in men.
A new multicenter study is being conducted to assess the safety of testosterone gel (LibiGel) for postmenopausal women with low sexual desire. The study aims to enroll 2,400 to 3,100 women aged 50-80 with hypoactive sexual desire disorder and follow them for at least a year.
A new study by Arizona State University researchers found that artificially coloring the breast feathers of male barn swallows increased their testosterone levels, challenging the traditional view that internal processes determine external features. The study suggests a dynamic system where physical appearance affects physiology.
Low testosterone levels in men are often untreated, even among those with sufficient healthcare access, according to a study of Boston-area men. Despite this, treated and untreated men report similar healthcare visits, suggesting barriers may lie in diagnosis or prescription issues.
Recent studies in Biology of Reproduction suggest that maternal follicular testosterone influences the sex of bovine embryos, while research on maternal cell microchimerism reveals its presence in major organs of healthy newborn mice. These findings highlight the importance of understanding the mechanisms behind these phenomena.
Research at University of Cambridge reveals high morning testosterone levels increase City traders' profits for the rest of the day. Testosterone is found to boost confidence and appetite for risk, leading to a positive-feedback loop that can be detrimental if excessive.
A study found that testosterone spray increased frequency of sexually satisfying events in premenopausal women, but the effect was only significant for the middle dose. Conventional treatments like cognitive behavioral therapy and sex therapy are recommended over hormone replacement therapy.
Preliminary study results show testosterone administration reduces bone turnover, with potential protective effects on existing bone mass. Testosterone replacement therapy may benefit older men with low-to-normal testosterone concentrations.
A University of Iowa study reveals a biological link between pain and fatigue, with a protein called ASIC3 playing a crucial role in protecting against muscle fatigue in women. Women are more likely to be diagnosed with chronic pain conditions like fibromyalgia and chronic fatigue syndrome due to hormonal differences.
A study of 3,987 older men found that those with low free testosterone levels had a higher prevalence of depression, with men in the lowest quintile having three times the odds of depression compared to those in the highest quintile. Researchers suggest that hormone imbalances may contribute to this link.
New MSU study finds that prenatal testosterone exposure may protect against anorexia and bulimia in females, with those exposed to male twins showing lower risk. The findings suggest a biological link between testosterone and eating disorders.
A study of 609 men aged 72.6 found that those with low blood testosterone levels had a significantly higher risk of fractures, particularly hip and non-vertebral fractures. The study suggests that measuring serum testosterone may provide additional clinical information for assessing fracture risk in elderly men.
A new study finds that high fructose and glucose intake can reduce SHBG protein levels, increasing testosterone and estrogen availability. This disruption is associated with acne, infertility, and cardiovascular disease risks.
Researchers have discovered a stable sex hormone signature in cells that may provide a more sophisticated way to determine sex than just identifying the presence of the Y chromosome. This breakthrough could lead to improved counseling for intersex individuals with ambiguous gender identities.