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Nathan Goodyear

Testosterone Replacement in Hypogonadal Men With Type 2 Diabetes and/or Metabolic Syndr... - 0 views

    Testosterone therapy in men with low Testosterone was found to improve insulin sensitivity, total cholesterol levels, LDL, Lpa, and sexual performance in men with low T, type II diabetes and/or metabolic syndrome.  There is suggestion that muscle composition was improved as well.
Nathan Goodyear

Predictors of skeletal muscle mass in elderly men and women - 0 views

    Study of men and women finds that low free Testosterone, physical activity, and IGF1 is associated with muscle mass in men; no such relationship between sex hormone and muscle mass in women was found.
Nathan Goodyear

Relationship between Low Free Testosterone Levels and Loss of Muscle Mass : Scientific ... - 0 views

  • Our data confirm that a low FT level is a significant predictor of a risk for loss of appendicular muscle
  • Total lean mass is associated with bioavailable T in postmenopausal women
  • Further studies are needed to determine the role of androgens in preserving muscle mass in women
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  • Approximately 1% to 2% of T in the blood exists as FT
  • appendicular muscle loss was significantly associated with low levels of FT
  • These results suggest that a threshold level of FT exists for muscle loss, rather than a dose-response relationship
  • In the previous cross-sectional and longitudinal studies of French and American men, no dose-response relationships were reported between T and muscle mass
  • A minimal serum level of FT may be needed to preserve muscle mass in men, regardless of race/ethnicity.
  • Our result is in line with previous studies that reported a relationship between low FT and low muscle mass in men
  • T stimulates protein synthesis and inhibits protein degradation in muscle cells
  • T also increases satellite cell replication and activation in older men
  • In this study, no significant association between TT levels and muscle loss were observed
  • Although a progressive decrease in TT levels with ageing is observed in middle-aged and elderly American men16, 17, the TT levels do not change during ageing in Japanese men
  • FT levels may be a good marker for the loss of muscle mas
    study of Japanese men finds that low free Testosterone was a predictor of decrease in muscle mass.
Nathan Goodyear

Testosterone and weight loss: the evidence - 0 views

    • Nathan Goodyear
      What a ridiculous statement!
  • Testosterone therapy increases LBM, reduces fat mass and produces sustained and significant weight loss, reduction in waist circumference and BMI
Nathan Goodyear

Fifty- two-Week Treatment With Diet and Exercise Plus Transdermal Testosterone Reverses... - 0 views

  • there appears to be a positive correlation between serum testosterone levels and insulin sensitivity in men across the full spectrum of glucose tolerance (Pitteloud et al, 2005), and this relationship is at least partially direct and not fully dependent on (changes in) elements of the MetS
  • supervised D&E alone led to significant improvements in testosterone concentrations, glycemic control, and components of the MetS
  • diet control, exercise, and testosterone supplementation may be beneficial in the management of men with T2D
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  • androgen-deprivation therapy in males with prostatic cancer may be associated with an increased risk for T2D, which may be caused by negative effects on insulin sensitivity
  • insulin sensitivity, measured by HOMA, improved in both groups and with a significantly greater degree when testosterone was added to supervised D&E
  • Fasting insulin concentrations, a good representative of insulin sensitivity, did show a significant correlation with changes in circulating androgen levels, an observation in support of Pitteloud et al (2005), who showed a direct relationship between insulin sensitivity and circulating testosterone concentrations using the hyper-insulinemic euglycemic clamp technique
  • 52 weeks of testosterone treatment also significantly improved circulation levels of adiponectin and hsCRP, key serum markers of insulin sensitivity and hepatic steatosis
  • The changes in both adiponectin and hsCRP were significantly correlated with the therapy-induced changes in bioavailable testosterone
  • a negative correlation was found between hsCRP levels and bioavailable testosterone
  • serum PSA concentrations did not differ between the 2 treatment groups, indicating that short-term testosterone administration appears to be acceptably safe
    Study of men with metabolic syndrome and type II Diabetes finds that diet and exercise alone improved glucose control and metabolic syndrome components by 31%.  The addition of Testosterone therapy increased this % to 81%.
Nathan Goodyear

Menopause and the Metabolic Syndrome - 0 views

    Menopause transition can become a Testosterone dominant phase associated with increased CVD and increased metabolic syndrome.
Nathan Goodyear

Metabolic syndrome, testosterone, and cardiovascular mortality in men. - PubMed - NCBI - 0 views

    study of 596 men finds that lower bioavailable Testosterone in those men with Metabolic Syndrome, have an increased cardiovascular mortality in those > 40.
Nathan Goodyear

Sex Hormone-Binding Globulin, but Not Testosterone, Is Associated Prospectively and Ind... - 0 views

    Framingham Heart Study finds that low SHBG, not Testosterone was associated with increased risk of metabolic syndrome.
Nathan Goodyear

PLOS ONE: Testosterone, Sex Hormone-Binding Globulin and the Metabolic Syndrome in Men:... - 0 views

    Meta-analysis finds that men with low total Testosterone, free Testosterone, and SHBG are more at risk for MetS than those with elevated levels.
Nathan Goodyear

Testosterone and metabolic syndrome: a meta-analysis study. - PubMed - NCBI - 0 views

    Men with metabolic syndrome have lower Testosterone levels when compared to "healthy" individuals.  All men with MetS should have a full androgen analysis performed.  This meta-analysis of 20 studies found Testosterone therapy reduced fasting glucose, HOMA, triglycerides, waist circumference by Testosterone in men with MetS.  This study found that Testosterone therapy increased HDL as well.
Nathan Goodyear

Aging, androgens, and the metabolic syndrome in a longitudinal stud... - PubMed - NCBI - 0 views

    In men, 20-94, lower Total Testosterone and SHBG was found to be associated with a higher incidence of metabolic syndrome.  Abstract only.  The greatest association was found with SHBG.
Nathan Goodyear

Cytokines and steroidogenesis. - PubMed - NCBI - 0 views

    Inflammatory cytokines appear to inhibit hormone production at the levels of the adrenal glands, testes, and ovaries.  This is in addition to suppression at the level of the hypothalamus and pituitary.  One proposed mechanism is via a reduction of sensitivity of the testes to LH.
Nathan Goodyear - 0 views

    Men with Obesity are found to have lower SHBG and Testosterone levels.  This study found that suppression of insulin resulted in an increase in SHBG production from the liver in both obese and normal weight men.  Of note, the decrease in insulin resulted in a decrease in male Testosterone in both normal weight and obese men.
Nathan Goodyear - 0 views

    Elevated insulin levels in men is associated with decreased liver production of SHBG and thus reduced SHBG levels.  Obesity is associated with decreased urinary cortisol in this study.  The authors found the low cortisol also contributed to the low SHBG as well. Low SHBG is associated with puberty, obesity, IR, hypothyroidism, and during androgen therapy.  SHBG is increased as a result of aging, short-term fasting, Estrogen, hyperthyroid, and liver disease.
Nathan Goodyear

Testosterone therapy in men with prostate cancer: literature review, clinical experienc... - 0 views

    To be read article on Testosterone and prostate cancer.
Nathan Goodyear

Fifty-two-week treatment with diet and exercise plus transdermal te... - PubMed - NCBI - 0 views

    This article finds that Testosterone transdermal therapy addition to Diet and exercise improved glycemic control and reversed Metabolic Syndrome in men with low T and type II Diabetes.  This article really highlights the proper approach to therapy: combined nutrition, exercise, and Testosterone therapy, when indicated, for men with Metabolic Syndrome and/or Diabetes.  A reduction in IR, adiponectin and hsCRP was observed.
Nathan Goodyear

Testosterone and metabolic syndrome Cunningham GR - Asian J Androl - 0 views

  • The relationship of low testosterone to MetS often is considered to be bidirectional; however, the relationships probably are not direct
  • Many of the components of the MetS are recognized risk factors for the development of cardiovascular disease (CVD)
  • Multiple cross-sectional studies have found low TT and low sex hormone binding globulin (SHBG) levels in Caucasian and African-American men with the MetS, irrespective of age
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  • Low TT and SHBG levels also are prevalent in Chinese [7],[8] and Korean [9] men with the MetS
  • Normally 40%-50% of TT is bound to SHBG, so reducing SHBG levels will decrease TT.
  • Hyperinsulinism suppresses SHBG synthesis and secretion by the liver
  • significant increase in SHBG levels occurred after acutely lowering insulin levels in obese men
  • Estradiol levels are increased in men with the MetS, and they are positively correlated with the number of abnormal components of the MetS.
  • Although it is known that estrogen will increase SHBG levels, apparently the hyperinsulinism associated with obesity has a greater effect on SHBG levels
  • Estradiol also can inhibit luteinizing hormone (LH) secretion
  • Inflammatory cytokines are thought to have a direct effect on the pituitary to reduce LH secretion [15] and also a direct effect on Leydig cell secretion of testosterone
  • Low TT Levels have been shown to predict development of the MetS in men with normal BMI
  • Men in the lowest quartiles of serum TT, calculated free testosterone (cFT) and SHBG at baseline had the highest odds ratios for developing the MetS or DM during the 11 years follow-up
  • More recently, investigators conducting population-based studies have reported that only SHBG is associated with future development of the MetS
  • Additional evidence that low TT increases the risk of MetS comes from androgen deprivation treatment of prostate cancer
  • Low TT and low bioavailable testosterone (bT) were each significantly associated with elevated 20 years risk of CVD mortality in an older population in which cause-specific mortality was age, adiposity, and lifestyle-adjusted.
  • combination of low bT and ATP III-defined MetS is associated with increased cardiovascular mortality in men aged 40 years and above
  • in elderly men, testosterone may weakly protect against CVD. Alternatively, low TT may indicate poor general health
  • Muraleedharan and Jones [27] concluded that there is convincing evidence that low T is a biomarker for disease severity and mortality.
  • The evidence that TRT improves insulin sensitivity and glucose control is conflicted
  • It is widely recognized that testosterone treatment can reduce fat mass and increase lean body mass; however, until recently most reports have not been associated with much weight loss
  • Changes in body composition and weight loss are considered potential mechanisms by which testosterone treatment improves insulin sensitivity and glucose control in patients with diabetes. Effects on inflammatory cytokines [38] and changes in oxidative metabolism [39] also have been reported to improve glucose metabolism.
  • Testosterone replacement therapy has been reported to improve some or all of the components of the MetS.
    To be read article on Testosterone and Metabolic Syndrome.
Nathan Goodyear

Late-onset hypogonadism among old and middle-aged males with predia... - PubMed - NCBI - 0 views

    Only abstract available here.  Study of Polish men found lowered Testosterone in men with pre diabetes.  The authors used the term "late onset hypogonadism" here.  An inverse association was found between calculated free Testosteorne and HgbA1c.  The authors conclusion says it all: routine screening of Testosterone in men with pre-diabetes is recommended.
Nathan Goodyear

The association between serum dehydroepiandrosterone sulfate (DHEA-... - PubMed - NCBI - 0 views

    Only abstract available here, but lower DHEA-S (still in reference normal range) associated with lower bone mineral density and increased osteoporosis risk.
Nathan Goodyear

Testosterone suppression in opioid users: A systematic review and m... - PubMed - NCBI - 0 views

    Opioid use, despite type (including methadone), is associated with lower Testosterone in men.  This is not new information, but this meta-analysis reconfirms this relationship, particularly that methadone has the same effect.  This relationship was not found in women.  These physicians that regularly prescribe opiates  to men are doing them an incredible disservice.  A lower T in men is a significant negative health biomarker.
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