Articles tagged with Testosterone
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.
Research on male dark-eyed juncos reveals that fluctuations in testosterone levels drive males to seek mates but also cause them to lose interest in parenting. Males with stable testosterone levels are more likely to invest time and energy in parenting, while those with fluctuating levels exhibit mixed behavior.
Researchers found that even aloof husbands have lower testosterone levels than unmarried men, challenging previous North American studies. Married men with multiple wives had even lower testosterone levels than monogamously married men.
A study on Gambel's white-crowned sparrows reveals that the brain regions controlling singing behavior shrink rapidly after testosterone withdrawal, leading to neuron loss and apoptosis. This natural phenomenon may hold potential medical implications for understanding age-related degenerative diseases such as Parkinson's and dementia.
Researchers found no relationship between statin use and reduced testosterone levels in men, suggesting poor health is a greater factor. Statin use was associated with lower total testosterone levels, but this association vanished when considering age, body weight, and other factors.
A recent study using spontaneously hypertensive rats found that testosterone supplements promote renal injury and exacerbate hypertension in aging male rats. The research suggests that natural decrease in testosterone levels with age may affect the progression of cardiovascular/renal disease in men taking testosterone replacement therapy.
A team of researchers at the University of Illinois has discovered a key gene involved in the development of the epididymis, a critical structure for sperm fertility. The gene, inhibin beta A, plays a vital role in stimulating cell growth and differentiation, leading to the formation of the epididymal tube.
A new study by the University of California, San Diego School of Medicine has linked low testosterone levels to an increased risk of death in older men. The research followed nearly 800 men aged 50-91 for an average of 18 years and found that those with low testosterone had a 33% greater risk of death.
A $1.7 million grant will help improve and standardize hormone measurements, specifically testosterone, among laboratories nationwide. The project aims to better diagnose and manage hormone-related diseases like hypogonadism in men.
A new study found that a child's finger length can predict their performance in numeracy and literacy tests. The researchers discovered that a higher digit ratio, indicating greater prenatal testosterone exposure, is associated with stronger numeracy skills. In contrast, a lower digit ratio is linked to higher literacy scores for girls.
A small pilot study suggests that testosterone treatment is safe and well-tolerated and may reduce symptoms, slow brain degeneration, and increase muscle mass in men with relapsing-remitting multiple sclerosis. Testosterone treatment showed a possible neuroprotective effect on the brain.
A pilot study at UCLA found that testosterone gel reduced MS symptoms, slowed brain degeneration, and increased muscle mass in men with relapsing-remitting multiple sclerosis. The study suggests a possible neuroprotective effect of testosterone treatment in men with MS.
A randomized clinical trial found that topical testosterone cream did not improve libido in postmenopausal female cancer survivors compared to a placebo. The study suggests that estrogen levels may be a crucial factor in the effectiveness of testosterone therapy for sexual desire in women.
Researchers found females outperform males in using landmarks for navigation, even with blocked testosterone levels. This study provides insight into brain development and may lead to better treatments for disorders like ADHD and Alzheimer's.
A recent study published in the journal SLEEP found that healthy older men who get less nighttime sleep have lower morning testosterone levels. The study, conducted by Plamen Penev, MD, PhD, used polysomnography and wrist activity monitoring to measure sleep duration and its impact on testosterone levels.
A study by the University of Rochester Medical Center has found a link between phthalate exposure and increased belly fat and insulin resistance in men. The research suggests that low-dose exposures to phthalates may contribute to rising obesity rates and related disorders such as Type 2 diabetes.
Scientists at IGBMC have identified SHP protein as a major player in controlling testosterone synthesis and differentiation of germ cells in mouse testes. Mice without SHP protein reproduced earlier than controls, suggesting its role in regulating sexual maturity.
Researchers found that mice deficient for SHP exhibited an earlier onset of fertility due to reduced repression on testosterone production and germ cell differentiation. This discovery may lead to exploration of SHP in human subjects with fertility issues.
Two Mayo Clinic studies found no strong evidence supporting testosterone's safety from cardiovascular harm and inconsistent results regarding its impact on sexual dysfunction. The research highlights the need for large-scale trials to inform clinicians' decisions about prescribing testosterone.
Researchers at USC discovered a link between low testosterone and the development of an Alzheimer's-like disease in mice. Testosterone treatment slowed progression of the disease, predicting potential benefits for humans.
A cohort study of over 2,000 Air Force veterans found that dioxin exposure was associated with a lower incidence of benign prostate hyperplasia (BPH) and decreased testosterone levels. The study suggests a link between dioxin exposure and endocrine disturbances in the male reproductive system.
A study found that testosterone replacement therapy had little effect on prostate tissue, contrary to previous concerns. The treatment increased serum testosterone levels but showed no significant changes in prostate histology or cancer incidence.
A study of 2,587 elderly men found that those with lower bioavailable testosterone levels were more likely to fall. Muscle weakness and coordination issues may play a role in this association.
A Mayo Clinic study of 144 participants found that dehydroepiandrosterone (DHEA) supplements had no effect on age-related changes in body composition, physical performance, or quality of life. The study's findings contradict previous reports and suggest that DHEA should be treated as a regulated drug.
A Yale University study reveals that high levels of testosterone can lead to programmed cell death in nerve cells, associated with conditions like Alzheimer's disease. Elevated testosterone also triggers behavioral changes such as hyperexcitability and suicidal tendencies.
Men with low testosterone levels after age 40 face a higher risk of death over a four-year period compared to those with normal hormone levels. Testosterone decline is associated with decreased muscle mass, bone density, and increased mortality.
A prospective study found that higher estrogen levels in older men are associated with an increased risk of dementia. In contrast, testosterone levels were not linked to cognitive decline.
Studies found that oxytocin nasal spray reduces stress during marital conflict, while testosterone fuels competition in women athletes. Hockey teams experience increased testosterone and cortisol levels before home games, suggesting a hormone surge for defending territory.
Researchers found 322 genes in the adrenal gland with rhythmic functions, separate from the master body clock. This discovery may impact therapies for diseases and improve treatment outcomes.
A recent study conducted by the UCLA School of Medicine found that testosterone replacement therapy does not negatively affect the prostate or its tissues in hypogonadal men. The six-month trial involved 41 men with low testosterone levels and showed no changes in prostate tissue, PSA, or DHT levels.
A 12-month study found that testosterone patches improved bone density, body composition, and cognitive function in women with low testosterone levels resulting from hypopituitarism. The patches showed few side effects, making them a potential treatment option for these women.
Researchers found that women can accurately determine a man's interest in children and testosterone levels from his facial expressions. This study suggests that a man's affinity for children is an important factor in his long-term mate attractiveness, even after accounting for physical attractiveness.
Research reveals that social perception plays a significant role in gaze-following behavior among executive monkeys. Low-ranking macaques exhibit faster reaction times to follow the gaze of other monkeys, while high-ranking individuals are more blasé.
Research suggests that oral contraceptives may cause chronic elevation in sex hormone binding globulin levels, leading to reduced unbound testosterone and potential long-standing health problems. This can result in decreased desire, arousal, lubrication, and increased sexual pain in women.
A double-blind, placebo-controlled study found that Alzheimer patients treated with testosterone showed significant improvements in quality-of-life scores compared to those receiving a placebo. However, there were no significant differences in cognitive skills.
Researchers found that testosterone therapy significantly improved quality-of-life scores in men with mild Alzheimer's disease. However, the study's results do not warrant routine treatment and require further investigation before clinical decisions can be made.
A study found that male SIDS infants had 120% higher testosterone levels than non-SIDS males, while females had 50% higher levels. The researchers suggest this may contribute to the risk of SIDS due to its effect on breathing during sleep.
A 24-week clinical trial found that testosterone patches significantly improved sexual desire and frequency of satisfying sexual activity in surgically menopausal women with hypoactive sexual desire disorder. The middle dosage group showed a 67% increase in questionnaire scores for sexual desire compared to the placebo group.
Researchers investigated whether low serum testosterone levels are associated with low sexual function in women. The study found no evidence of associations between low scores for any sexual domains and low serum total and free testosterone levels.
A cross-sectional study of 2,162 men found that 38.7% had low testosterone levels and 23% had a history of diabetes. Men with diabetes and low T were 2.09 times more likely to have hypogonadism, a condition characterized by low testosterone production.
A lab study found that administering male sex hormones to female mice increases their susceptibility to developing abdominal aortic aneurysms. The goal now is to identify the target of these hormones to develop drugs that can lower the incidence of life-threatening aneurysms.
Research at the University of Alberta found a direct correlation between shorter index finger lengths and increased likelihood of physical aggression in men. Finger length was not correlated with verbal aggression, but rather with physically aggressive behavior.
UCL surgeons successfully performed phalloplasty to rebuild micropennises in nine men, with four able to urinate standing up and four have regular sex. However, complications arose in several cases, highlighting the need for awareness and careful monitoring.
A recent study revealed that nearly one-third of diabetic men suffer from hypogonadism, a condition caused by improper functioning of the pituitary gland or hypothalamus. The high prevalence of low testosterone levels in diabetic patients is concerning and associated with various health issues such as loss of muscle tone, increased abd...
Researchers found that testosterone impairs T-lymphocyte function, leading to a weakened immune response in men. In contrast, females' immune systems are more active without significant levels of testosterone, making them more prone to autoimmune diseases.
A study found that word retention drops sharply after two minutes among men undergoing testosterone deprivation therapy, despite initial encoding being similar to healthy men. The lack of testosterone affects the function of the hippocampus, a curved ridge in the brain controlling learning and memory.
Research suggests reproductive hormones like estradiol affect the brain's growth and development, influencing cognitive functions such as learning and memory. Estradiol has complex interactions with these processes, differing between males and females, and may help explain gender differences in cognition and mental diseases.
A new study shows that a combination of fluticasone and salmeterol can achieve total control in asthma patients, improving symptoms and reducing corticosteroid doses. Testosterone therapy also increases lean body mass and leg muscle strength in COPD patients with low testosterone levels.
Researchers found testosterone sped up recovery from strokes in castrated rat studies, showing significant improvement in neurological deficits. Plans are underway to investigate whether testosterone can help people recover from strokes.
Researchers studied 31 healthy men with medication-induced hypogonadism, finding that acute testosterone suppression led to low blood levels of testosterone. Most participants showed no significant differences in symptoms between leuprolide plus placebo and leuprolide plus testosterone groups.
Research finds that age-related testosterone depletion promotes Alzheimer's disease in men by protecting neurons from injury and reducing beta-amyloid protein levels. The study suggests that understanding the link between testosterone loss and Alzheimer's is crucial for identifying those at risk.
Girls spent more time in feminine activities with lower testosterone levels and reported interest, while masculine activities increased until age 13. Family characteristics, such as personality traits and attitudes, also predicted involvement in sex-typed activities.
Research suggests that individuals with asymmetrical body parts are more likely to show signs of aggression. The study found that men and women responded differently to provocation, with men using more force when ending a low-provocation call but women becoming more aggressive in high-provocation situations.
A study found that combining testosterone gel with sildenafil improved erectile function in men with low testosterone, who failed to respond to sildenafil alone. The combination therapy showed significant improvements in erectile function, orgasmic function, and overall satisfaction.
Researchers at the University of Washington have discovered that a spike in hormone levels can induce changes in female fish's hearing sensitivity, allowing them to detect higher frequencies. This neural plasticity may affect all vertebrates and could have implications for human hearing loss.
A study of 1423 women aged 18-75 reveals that DHEAS, total testosterone, and free testosterone levels decline sharply in the early reproductive years. In contrast, androgen levels do not change during natural menopause. The findings highlight the importance of understanding hormone levels in women across all ages.
Researchers found a strong correlation between low DHEAS levels and reduced desire, arousal, and responsiveness in women under 45. The study suggests that low DHEAS may be a more accurate indicator of low libido than testosterone levels.
A study found that moderate alcohol consumption increases plasma DHEAS levels in both men and women, decreases testosterone in men, and has no effect on estradiol levels. These findings suggest that DHEAS may play a protective role against atherosclerosis.
Researchers found that estrogen therapy can suppress adrenal androgen production, with marked reductions in DHEA-S, A4, and testosterone levels. The study suggests a potential mechanism for how estrogen affects androgen hormones, and has implications for postmenopausal women.
Researchers found a significant association between high blood testosterone levels and an increased risk of prostate cancer in older men. The study, which followed over 3,000 men for 40 years, also showed that the protein sex hormone-binding globulin (SHBG) was associated with a slightly decreased risk for prostate cancer.