Articles tagged with Testosterone
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.
The study found significant improvements in mood and sexual performance, with sustained increases in lean body mass and bone mineral density over 3.5 years. Researchers observed minimal skin irritation and no major adverse effects, paving the way for testosterone gel as a safe treatment option.
Despite a growing need for new antibiotics, only six are being developed out of 506 drugs, with FDA approvals declining by 56% over the past 20 years. Researchers have identified a novel structural signature in antimicrobial peptides that could accelerate development of new treatments.
A study at Massachusetts General Hospital found that natural testosterone delivery products improved muscle strength and function in HIV-infected women with low testosterone levels. The treatment resulted in significant improvements in muscle mass and overall quality of life.
A new study found that taking DHEA, a hormone supplement popular among athletes, does not increase testosterone levels but boosts other harmful hormones associated with prostate growth. Researchers tested 12 healthy men and found increased levels of byproduct hormones that may be bad for the prostate.
A study of 278 men aged 45+ without depression found that low testosterone levels were associated with a higher incidence of diagnosed depression. Men with hypogonadism were 4.2 times more likely to be diagnosed with depression than those with normal testosterone levels.
A comprehensive review of 72 studies found no evidence that testosterone replacement therapy increases prostate cancer or cardiovascular disease risk. Testosterone therapy may alleviate symptoms of low testosterone levels, but monitoring is crucial due to potential side effects.
A study by NIH researchers found that low free testosterone levels may be associated with an increased risk of developing Alzheimer's disease in older men. The study, conducted on 574 men aged 32-87, revealed a 26% decrease in AD risk for every 50% increase in free testosterone index.
Researchers found that free testosterone was associated with a decreased risk of Alzheimer's disease in men. A Netherlands study also linked higher consumption of fatty fish to reduced impaired cognitive function and speed. In contrast, higher dietary cholesterol intake was associated with increased risk of impaired memory and flexibil...
A new study found that exercise mode, rather than volume, influences hormone levels and changes in testosterone, DHEAS, and cortisol. Resistance-trained males had higher basal testosterone levels, while endurance-trained males had lower testosterone levels compared to sedentary subjects.
The NIA is concerned about the growing use of testosterone replacement therapy without sufficient scientific information. Short-term studies are recommended to determine potential risks and benefits for symptomatic older men with low testosterone levels. Longer term trials will assess risks and benefits for these conditions, such as fr...
Researchers develop new approach to treating extreme artery blockages using G-CSF treatment. Insurance disparities are found in diabetic minorities with a lack of coverage driving disparities in preventive care.
Researchers found that dissatisfied shift workers experienced lower morning testosterone levels, while satisfied workers had no significant differences in cortisol or prolactin. The study suggests that low testosterone levels may contribute to shift intolerance due to disturbed sleep and increased need for recovery.
A new study has found that intense gymnastics training during childhood and adolescence does not have significant effects on resting testosterone or sexual maturation in male gymnasts. The research, published in the Journal of Applied Physiology, recruited 21 elite gymnasts and 24 age-matched boys to compare their physical and pubertal...
Research shows a significantly higher prevalence of PCO/PCOS in lesbian women compared to heterosexual women. The study found that hormones such as testosterone and luteinizing hormone were significantly higher in lesbian women, suggesting a link between PCOS and sexual orientation.
Penn State researchers found that wives with higher testosterone levels were more adaptive social support providers, while husbands with lower testosterone levels were more positive and less negative during discussions. Lower combined testosterone levels led to better social support givers and improved conflict resolution skills.
A new study found that acute alcohol consumption increases plasma and brain testosterone concentrations in male rats, contrary to previous research. The study's authors suggest individual differences may underlie these variations, providing new insights into the behavioral and endocrine effects of alcohol abuse.
Researchers found a link between maternal testosterone levels and increased masculine-typical behavior in girls, but no correlation for boys. The study analyzed data from over 13,000 children born in England and suggests that hormone-related predispositions may play a role in shaping gender roles.
A recent study found that a combination of growth hormone and sex steroids showed significant increases in lean body mass and decreases in fat mass, but also reported common side effects such as joint pain and swelling. The study suggests that the treatment is not yet ready for prime time due to its adverse effects.
Researchers found that male lions are intimidated by longer manes, while females prefer darker-maned males. Darker manes also correlate with higher testosterone levels, which may be an advantage for attracting mates and defending territories. Despite this, there is no correlation between mane length and temperature regulation.
A study led by REI investigators found that testosterone gel replacement significantly improved sexual motivation and performance, reduced fat mass, and increased lean body mass in hypogonadal men. The treatment was also found to increase bone mineral density and cause minimal skin irritation.
A study by E. Todd Schroeder and colleagues found that androgen therapy increased muscle mass, strength, and power in older men, improving their ability to perform daily activities. The findings suggest that supplemental androgen therapy might benefit older men prone to losing muscle mass due to sarcopenia.
Researchers developed a transdermal HRT patch that increased androgen levels, leading to higher libido and greater sexual satisfaction in postmenopausal women. The study suggests a potential new treatment approach for female sexual dysfunction, building on preliminary research showing testosterone supplements can enhance sex drive.
Researchers at Emory University Health Sciences Center have found a potential link between low testosterone levels and non-motor symptoms of Parkinson's disease in men. Testosterone replacement therapy showed significant improvement in patients with refractory symptoms, including fatigue, depression, anxiety, and decreased libido.
A new study suggests that testosterone may play a protective role against stroke in men, while estrogen levels are not linked to stroke risk. The study followed 6,732 individuals over five to eight years and compared serum levels of testosterone and estrogen between men who experienced strokes and those who remained healthy.
A new UCSF study found that older men with higher testosterone levels performed better on tests of cognition, including concentration, memory, and attention. However, the researchers emphasize that the study only examined natural testosterone levels and did not prove the benefits of testosterone supplements for cognitive health.
A recent study published in Hormone Research found that individuals born with a micropenis who were raised as males reported higher satisfaction rates and more positive body image compared to those raised female. The study also highlighted the importance of testosterone replacement therapy for male participants.
Researchers find that hormonal manipulation has no effect on virus responses in female rodents, suggesting genetic differences may be involved. In contrast, castrated male rats exhibit female-type responses to hantavirus infection.
A new study published in the Journal of Women’s Health and Gender-Based Medicine found that oral contraceptive Yasmin significantly reduces premenstrual pain, acne, and food cravings associated with PMDD. The study enrolled 82 women aged 18-40 who experienced severe PMS symptoms.
The European Society of Human Reproduction and Embryology is advocating for testosterone therapy in older men due to the increasing prevalence of age-related symptoms such as low energy, depression, and erectile dysfunction. Testosterone replacement therapy has been shown to alleviate these symptoms, particularly in men over 50 years old.
A study found that a testosterone skin patch can relieve impaired sexual functioning in surgically menopausal women. The patch restored normal testosterone levels, leading to improved sexual activity and pleasure, as well as overall psychological well-being. Adverse side effects were minimal.
A new study published in the New England Journal of Medicine found that a testosterone patch improved sexual function and psychological well-being in surgically postmenopausal women. The study showed that treatment with higher doses of testosterone substantially improved outcomes, while lower doses had less effect.
Abarelix depot-M successfully suppresses testosterone levels, achieving suppression by day 8 and maintaining it from day 29 through day 85. The studies validated PRAECIS' core technology and demonstrate a potentially new treatment option for prostate cancer.
Researchers found that HPTE inhibited testosterone production in developing and adult Leydig cells, with longer treatment times causing greater inhibition. The study suggests that understanding the effects of endocrine disruptors like HPTE may lead to new molecular targets for male contraceptives.
A study led by MGH researchers found that androstenedione supplementation increases testosterone levels in healthy young men, with estrogen levels also rising at both 100 and 300mg doses. Long-term effects of androstenedione on hormone levels and athletic performance are unknown
A genetic defect in a protein receptor has been identified as the cause of Leydig cell adenoma, a rare testicular tumor that triggers early puberty in boys. The mutation leads to rapid growth and overproduction of testosterone without normal hormonal signals.
Researchers suggest that testosterone plays a key role in redistributing immune cells to the skin during stress, rather than suppressing the immune system. This redistribution hypothesis is supported by studies in rats and mice, which show improved wound healing rates with testosterone treatment.
A new study reveals that prenatal exposure to higher levels of testosterone in pregnant smokers may predispose their daughters to develop a smoking habit as they age. Researchers analyzed data from over 240 pairs of mothers and daughters, finding no correlation between prenatal nicotine levels and later smoking behavior.
A study conducted at nine U.S. Centers found that a testosterone skin patch improves sexual function and psychological well-being in surgically menopausal women. The patch was well-tolerated and showed significant benefits in improving the quality of life for these women.
Researchers found that spotted antbirds in a Panama rainforest increase testosterone levels to boost aggression against invaders, even during the off-season. This finding has implications for understanding aggression regulation in humans and may reveal insights into physiological parameters.
A study by Dr. Ulrich Schweiger and colleagues found that severely depressed men have lower testosterone concentrations during the day and night, as well as higher cortisol levels. This disturbance of gonadal function may impair sexual function and increase the risk of heart disease and osteoporosis.
A study found that middle-aged men with higher testosterone levels are less likely to experience high blood pressure, heart attacks, and obesity. However, they are more likely to engage in unhealthy behaviors such as smoking and excessive drinking.
Researchers at Johns Hopkins University have identified melatonin as a key hormone that regulates brain plasticity in songbirds. The study found that melatonin reduces overall volume of the high vocal center, a brain area involved in song production, despite exposure to artificial daylight hours.
A diet rich in phytosterols reduces testosterone levels and activity of enzymes that metabolize testosterone into more active forms. The study suggests a potential link between plant-based fats and lower rates of hormone-dependent cancers.
Researchers found that testosterone injections significantly improved energy levels in 79% of HIV-positive men with low interest in sex and depressed mood. The treatment also boosted enjoyment and satisfaction with life, although the long-term effects remain unknown.
A recent study published in Annals of Internal Medicine found that testosterone administration significantly increases lean body mass and improves the quality of life in men with AIDS wasting syndrome. The treatment was shown to produce significant term benefits, making it an important new therapy for patients with this condition.
A study by Ohio State University researchers found that high-testosterone males were more likely to fertilize females other than their mates, resulting in fewer offspring with their own mates. Conversely, these males produced more offspring with the mates of their neighbors.
Research by Matthew Hardy and colleagues found that stress hormones overpower the enzymes responsible for producing testosterone in testes, leading to a suppression of sperm formation. The study provides insight into male reproduction and may aid the design of new male contraceptives.
Researchers found that high 'free' testosterone levels in adulthood and a small shoulder span may be related to hormone levels at various stages of development, suggesting a link between these factors and prostate cancer risk. Further study is needed to confirm these findings.
A Georgia State University study found that higher testosterone levels are related to violent crimes and aggressive behavior in women's prisons. The study also discovered that low testosterone was associated with manipulative and sneaky behavior, suggesting a link between hormone levels and dominance.
A recent Penn State study found that high-carbohydrate, low-fat diets may cause a drop in testosterone levels due to inadequate nutrient balance. The study revealed a positive correlation between dietary fat and resting testosterone levels before and after exercise.
Researchers at the University of Chicago Medical Center have found that testosterone can shrink experimental human prostate tumors that no longer depend on the hormone. This suggests a potential new approach for treating advanced prostate cancer.
A new study by Johns Hopkins Medicine reveals that testosterone replacement therapy may improve visual and spatial skills, as well as verbal fluency and memory in men with low testosterone. The findings suggest a potential role for testosterone in cognitive function and brain function.