Skin Appearance & Elasticity

Estrogen and the steroidal hormone, testosterone, play a pivotal role in maintaining firm skin. Therefore, hormone optimization may benefit this concern in the aging process, as suggested by various studies. Review current research and medical articles on skin appearance and elasticity to help ameliorate the decline of these age-related issues.


Fountain of Youth? Injections of Human Growth Hormone Are Being Used to Ward Off the Effects of Aging.pdf

This article, which quotes Dr. Alan Mintz, describes the increased use of human growth hormone by aging but relatively healthy people who hope to improve the quality, and perhaps the length, of their lives. It includes discussion for and against the use of growth hormone.
Kohn, D. (2006, April 7). Fountain of youth? Injections of human growth hormone are being used to ward off the effects of aging [Electronic version]. The Baltimore Sun. (PDF).

Experts Consider HT for Younger Women.pdf

Questions still persist after the release of the July 2002 Women’s Health Initiative findings regarding hormone therapy.  Researchers have been looking at the data to see if certain changes in dosage or initiation age could still provide benefits to women.
Elliott, V.S., (2005, February 28). Experts consider HT for younger women [Electronic version]. American Medical News, pp. 19-20.  Retrieved April 28, 2005.

Male Hormones Could Help Slow Aging in Men, WU Doctor Says.pdf

According to this article, the natural medical response to decreasing testosterone in men is to want to replenish low hormone levels. Yet no large-scale study has done for men what the massive Women's Health Initiative did for women: Investigate the effects of replacing important sex hormones in the aging. But as demographic shifts bring an increasingly older population, male hormone replacement therapy, or HRT, is becoming a priority.
Kean, S. (2005, August 2). Male hormones could help slow aging in men, WU doctor says [Electronic version]. St. Louis Post-Dispatch. Retrieved October 20, 2005.

Endogenous Sex Hormone Levels and Cognitive Function in Aging Men: Is There an Optimal Level?.pdf

The objective of this article is to determine whether endogenous sex hormone levels are associated with cognitive functioning in men.
Muller, M., Aleman, A., Grobbee, D.E., de Haan, E.H. & Van Der Schouw, Y.T. (2005). Endogenous sex hormone levels and cognitive function in aging men: is there an optimal level? [Electronic version]. Neurology, 64(5), 866-71. Retrieved May 6, 2005.

Endogenous Sex Hormones and Metabolic Syndrome in Aging Men.pdf

This study concluded that higher testosterone and SHBG levels in aging males are independently associated with a higher insulin sensitivity and a reduced risk of the metabolic syndrome, independent of insulin levels and body composition measurements, suggesting that these hormones may protect against the development of metabolic syndrome.
Muller, M., Grobbee, D.E., den Tonkelaar, I., Lamberts, S.W. & van der Schouw, Y.T. (2005). Endogenous sex hormones and metabolic syndrome in aging men [Electronic version]. The Journal of Clinical Endocrinology and Metabolism, 90(5), 2618-2623. Epub 2005, February 1. Retrieved September 19, 2005.

Treating Low Testosterone in Older Men Remains Controversial. Treating Hypogonadism in Older Men May Reduce Mortality, but Long-Term Data are Limited.pdf

Adrian Dobs, MD, professor of endocrinology at the Johns Hopkins University School of Medicine, spoke about low testosterone at the 87th Annual Meeting of the Endocrine Society.  Dobs said data from the Baltimore Longitudinal Study of Aging demonstrated that as many as 50% of men between the ages of 70 and 79 may have hypogonadism.
Lewis, J. (2005). Treating low testosterone in older men remains controversial. Treating hypogonadism in older men may reduce mortality, but long-term data are limited [Electronic version]. Endocrine Today, 3(8), 19. (PDF)

Review of the Book The Sexy Years: Discover the Hormone Connection: The Secret to Fabulous Sex, Great Health, and Vitality, for Women and Men.pdf

Review by Amazon.com of Suzanne Somers’ book The Sexy Years: Discover the Hormone Connection: The Secret to Fabulous Sex, Great Health, and Vitality, for Women and Men.
Lightner, J. (2004). [Review of the book The sexy years: Discover the hormone connection: the secret to fabulous sex, great health, and vitality, for women and men]. Retrieved September 10, 2004.

Does Testosterone Boost an Actor's Oscar Odds?.pdf

Testosterone surges may be one of the factors that separate Oscar-winners like Jack Nicholson and Al Pacino from aspiring actors whose careers never get off the ground, new study findings suggest.
Stenson, J. (2003, March 21). Does testosterone boost an actor's Oscar odds? [Electronic version]. Reuters Health. Retrieved October 31, 2005.

Can Growth Hormone Prevent Aging?.pdf

This article cites the article by Rudman et al. that appeared in the Journal in 1990 that reported the effect on body composition of administering human growth hormone for six months to 12 older men. This article incited a proliferation of "antiaging" clinics and lay publications, such as "Grow Young with HGH," extolling the benefits of growth hormone in reversing or preventing aging.
Vance, M.L. (2003). Can growth hormone prevent aging? [Electronic version]. The New England Journal of Medicine, 348(9), 779-780. Retrieved October 31, 2005.

Male Menopause & Chronic Fatigue Syndrome.pdf

This article says that it might come as a shock to some, but men can suffer from a form of menopause similar to what women endure. In fact this malady, sometimes called male menopause, shares a number of Chronic Fatigue Syndrome (CFS) symptoms.
Addington, J.W. (2002, January 2). Male menopause & chronic fatigue syndrome [Electronic version]. ImmuneSupport.com Website. Retrieved October 31, 2005.

Severely Burned Patients After Surgery: Recombinant Human Growth Hormone Therapy its Metabolic Effects.pdf

This study concludes that recombinant human growth hormone (rhGH) has a beneficial effect on metabolism in patients who are severely burned.  Hyperglycemia, however, is apt to occur and water, Na(+), Cl(-) retention are suggested.  Fifty patients were studied.
Chai, J., Hao, D., Wu, Y., Shen, C., Guo, Z. & Sheng, Z. (2002). [Severely burned patients after surgery: recombinant human growth hormone therapy its metabolic effects] [Article in Chinese] [Electronic version]. Zhonghua Wai Ke Za Zhi [Chinese Journal of Surgery], 40(2), 107-111. Retrieved May 18, 2005.

The Effects of Recombinant Human Growth Hormone on the Metabolism of Branch Chain Amino Acid in Severely Burned Patients.pdf

Fifty severely-burned patients were enrolled in this study, the aim of which was to explore the effects of recombinant human growth hormone (rhGH) on the metabolism of branch chain amino acid when applied postoperatively.
Chai, J., Hao, D., Wu, Y., Shen, C. & Sheng, Z. (2002). [The effects of recombinant human growth hormone on the metabolism of branch chain amino acid in severely burned patients] [Article in Chinese] [Electronic version]. Zhonghua Shao Shang Za Zhi [Chinese Journal of Burns], 18(4), 229-31. Retrieved May 18, 2005.

Reduced Capillary Permeability and Capillary Density in the Skin of GH-Deficient Adults: Improvement After 12 Months GH Replacement.pdf

A study involving seven normotensive, nondiabetic GH-deficient adults (two women) evaluated skin capillary permeability and capillary density.  It found that the growth hormone deficiency syndrome is associated with microvascular alterations, which are responsive to growth hormone replacement.
Oomen, P.H., Beentjes, J.A., Bosma, E., Smit, A.J., Reitsma, W.D. & Dullaart, R.P. (2002). Reduced capillary permeability and capillary density in the skin of GH-deficient adults: improvement after 12 months GH replacement [Electronic version]. Clinical Endocrinology (Oxford), 56(4), 519-524. Retrieved May 18, 2005.

What are "Normal" Testosterone Levels for Women?.pdf

In this Letter to the Editor, the authors conclude that the role of androgens in women is becoming increasingly more recognized and established. Certainly, the use of androgens, particularly testosterone, has been shown to influence life aspects, such as mood, women’s general well being and restoration of sexual desire. However, there is limited data establishing normal androgen values for women of differing ages, to enable us to define those with "androgen deficiency." They say it is, therefore, necessary to highlight the incongruencies and short-comings of the paper by Laughlin et al. (Laughlin G, Barrett-Connor E, Kritz-Silverstein D, Von Muhlen D. 2000 Hysterectomy, oophorectomy, and endogenous sex hormone levels in older women: the Rancho Bernado Study. J Clin Endocrinol Metab. 85:645–651), and the need for larger prospective studies to establish the variations in testosterone levels in women with age.
Davis, S. & Tran, J. (2001). What are "normal" testosterone levels for women? [Electronic version]. The Journal of Clinical Endocrinology and Metabolism, 86(4), 1842-1844. Retrieved October 3, 2005.

Hormonal Erectile Dysfunction. Evaluation and Management.pdf

This study showed that persistent low testosterone levels may have significant detrimental effects in other organ systems; therefore, a timely diagnosis of androgen deficiency and appropriate treatment may have significant effects outside the narrow field of sexual performance.
Morales, A. & Heaton, J.P. (2001). Hormonal erectile dysfunction. Evaluation and management [Electronic version]. The Urologic Clinics of North America, 28(2), 279-288. Retrieved October 3, 2005.

Hormonal Effects on Skin Aging.pdf

This article reviews the effect of decreasing hormone levels on the skin and the possible benefits of hormone replacement therapy (HRT).  It also discusses the positive effects Growth Hormone and estrogen can have on wound healing.
Phillips, T.J, Demircay, Z. & Sahu, M. (2001). Hormonal effects on skin aging [Electronic version]. Clinics in Geriatric Medicine, 17(4). Retrieved May 18, 2005.

Personal Business; Trying to Roll Back the Biological Clock, for a Price.pdf

This article, written soon after September 11th, says that Americans have been re-evaluating their priorities since the attacks, and for some people that means paying closer attention to their health. There has even been a rise in interest in so-called anti-aging clinics.  It discusses several clinics, including Cenegenics.
Siwolop, S. (2001, October 21). Personal business; trying to roll back the biological clock, for a price [Electronic version]. The New York Times. Retrieved October 31, 2005.

Androgen Replacement Therapy in the Aging Male--A Critical Evaluation.pdf

This article concludes that aging is unavoidable and physiologic, but the large interindividual disparity in the pace of development and progression of signs and symptoms of aging, suggests that the development of this symptomatology can be delayed and that a high quality of life can be maintained until a very advanced age, in other words that it is possible to add life to years. Being aware of these possibilities, more and more elderly men (and women) will seek medical help to achieve these goals.
Vermeulenn, A. (2001). Androgen replacement therapy in the aging male--a critical evaluation [Electronic version]. The Journal of Clinical Endocrinology and Metabolism, 86(6), 2380-2390. Retrieved October 3, 2005.

DHEA Replacement in Women with Adrenal Insufficiency--Pharmacokinetics, Bioconversion and Clinical Effects on Well-Being, Sexuality and Cognition.pdf

This study concludes that DHEA replacement improves well-being and sexuality in women with adrenal insufficiency. If this is due to a direct effect of DHEA on the brain, an indirect effect via increased androgen synthesis, or both, remains to be elucidated. Long-term studies in patients of both sexes are needed to further define the role of DHEA in standard replacement for adrenal insufficiency.
Arlt, W., Callies, F. & Allolio, B. (2000). DHEA replacement in women with adrenal insufficiency--pharmacokinetics, bioconversion and clinical effects on well-being, sexuality and cognition [Electronic version]. Endocrine Research, 26(4), 505-511. Retrieved September 14, 2005.

Testosterone Supplementation for Erectile Dysfunction: Results of a Meta-Analysis.pdf

In this study, the meta-analysis of the usefulness of androgen replacement therapy for erectile dysfunction indicates that the response rate for a primary etiology was improved over that for a secondary etiology, transdermal testosterone therapy was more effective than intramuscular or oral treatment, and intramuscular and oral treatments were equivalent. In addition, there was a statistically significant difference in favor of testosterone over placebo, implying a role for supplementation in select groups.
Jain, P., Rademaker, A.W. & McVary, K.T. (2000). Testosterone supplementation for erectile dysfunction: results of a meta-analysis [Electronic version]. The Journal of Urology, 164(2), 371-375. Retrieved October 3, 2005.

Testosterone Therapy in Men: An Update.pdf

This article discusses that because testosterone levels decline with age, and aging is accompanied by body changes including loss of muscle and increases in fat, there is great interest in the potential benefits of testosterone administration in elderly men.
Katznelson, L. (2000, Winter). Testosterone therapy in men: an update [Electronic version]. MGH Neuroendocrine Clinical Center Newsletter Bulletin, 6(2). Retrieved September 14, 2005.

Testosterone Replacement and the Physiologic Aspects of Aging in Men.pdf

The focus of the clinical investigations described here is to determine whether testosterone deficiency is a physiologic cause of the aging process and whether testosterone replacement might prevent or ameliorate a decline in quality of life associated with age-related decline in physical and psychological functioning.
Morley, J.E. (2000). Testosterone replacement and the physiologic aspects of aging in men [Electronic version]. Mayo Clinic Proceedings, 75 Suppl., S83-7. Retrieved October 3, 2005.

The Effects of Systemic Hormonal Replacement Therapy on the Skin of Postmenopausal Women.pdf

The aim of this study was to determine the effects of hormonal replacement therapy on the skin of postmenopausal women. It concluded that hormonal replacement for climacterics increases skin collagen content.
Sauerbronn, A.V., Fonseca, A.M., Bagnoli, V.R., Saldiva, P.H. & Pinotti, J.A. (2000). The effects of systemic hormonal replacement therapy on the skin of postmenopausal women [Electronic version]. International Journal of Gynaecology and Obstetrics, 68(1), 35-41. Retrieved January 4, 2006.

Dehydroepiandrosterone Replacement in Women with Adrenal Insufficiency.pdf

In a double-blind study, 24 women with adrenal insufficiency received in random order 50 mg of dehydroepiandrosterone orally each morning for four months and placebo daily for four months, with a one-month washout period. The study concluded that dehydroepiandrosterone improves well-being and sexuality in women with adrenal insufficiency.
Arlt, W., Callies, F., van Vlijmen, J.C., Koehler, I., Reincke, M., et al. (1999). Dehydroepiandrosterone replacement in women with adrenal insufficiency [Electronic version]. The New England Journal of Medicine, 341(14), 1013-1020. Retrieved September 14, 2005.

Risks Versus Benefits of Testosterone Therapy in Elderly Men.pdf

This review discusses the pros and cons of testosterone replacement in hypogonadal elderly men and attempts to answer some of the unanswered questions. Furthermore, emphasis is made on the regular follow-up of these patients to prevent the development of therapy-related complications.
Basaria, S. & Dobs, A.S. (1999). Risks versus benefits of testosterone therapy in elderly men [Electronic version]. Drugs & Aging, 15(2), 131-142. Retrieved September 14, 2005.

Anabolic Interventions for Age-Associated Sarcopenis.pdf

This commentary concludes that the body composition changes in old age are multifactorial and may be related to the concomitant changes in hormone production, protein turnover, and disuse atrophy. The evidence to support the use of testosterone or GH supplementation in age-related sarcopenia is only beginning to be presented.
Bross, R., Javanbakht, M. & Bhasin, S. (1999). Anabolic interventions for age-associated sarcopenis [Electronic version]. The Journal of Clinical Endocrinology and Metabolism, 84(10), 3420-30. Retrieved October 3, 2005.

The Influence of Systemic Growth Hormone Administration on the Healing Time of Skin Graft Donor Sites in a Pig Model.pdf

From this study it could be demonstrated both clinically and histologically that systemic application of growth hormone results in a statistically significantly more rapid healing of the skin graft donor sites by 2 days earlier than in the control group.
Ghofrani, A., Holler, D., Schuhmann, K., Saldern, S. & Messmer, B.J. (1999). The influence of systemic growth hormone administration on the healing time of skin graft donor sites in a pig model [Electronic version]. Plastic and Reconstructive Surgery, 104(2), 470-475. Retrieved September 16, 2005.

Down-Regulation Models and Modeling of Testosterone Production Induced by Recombinant Human Choriogonadotropin.pdf

Presented is a modeling study to provide a possible explanation for the observations that increased exposure to rhCG induces higher and then lower testosterone concentrations and that marked rebound effects are observed at the end of repeated administration of rhCG. The modeling results indicate that when rhCG concentration increases, the testosterone production rate increases to 45 times the baseline value. However, at an rhCG concentration of more than about 30 IU/liter, the production rate decreases. Simulations showed that both dose and dosing interval profoundly influence testosterone response to rhCG.
Gries, J.M., Munafo, A., Porchet, H.C. & Verotta, D. (1999). Down-regulation models and modeling of testosterone production induced by recombinant human choriogonadotropin [Electronic version]. The Journal of Pharmacology and Experimental Therapeutics, 289(1), 371-377. Retrieved October 3, 2005.

Psychosexual Effects of Menopause: Role of Androgens.pdf

The effects of androgens in the brain are mediated through androgen-specific receptors and by the aromatization of testosterone to estradiol. Alterations in the circulating levels of androgens play an important role in psychologic and sexual changes that occur after menopause.
Sarrel, P.M. (1999). Psychosexual effects of menopause: role of androgens [Electronic version]. American Journal of Obstetrics and Gynecology, 180(3 Pt. 2), S319-24. Retrieved October 3, 2005.

Hormones and Hair Patterning in Men: A Role for Insulin-Like Growth Factor 1?.pdf

Fifty-one men over age sixty-five participated in this study.  It concludes that testosterone, sex hormone-binding globulin and IGF-1 may be important in determining hair patterning in men.
Signorello, L.B., Wuu, J., Hsieh, C., Tzonou, A., Trichopoulos, D. & Mantzoros, C.S. (1999). Hormones and hair patterning in men: a role for insulin-like growth factor 1? [Electronic version]. Journal of the American Academy of Dermatology, 40(2 Pt. 1), 200-203. Retrieved May 24, 2005.

Insulin-Like Growth Factor 1 and Hair Growth.pdf

This article discusses that Insulin-like growth factor 1 (IGF-1) has been identified as an important growth factor in many biological systems and how IGF-1 may be able to stimulate the proliferation of hair follicle cells through cellular signaling pathways of its receptors.
Su, H.Y., Hickford, J.G., Bickerstaffe, R. & Palmer, B.R. (1999). Insulin-like growth factor 1 and hair growth [Electronic version]. Dermatology Online Journal, 5(2), 1. Retrieved May 24, 2005.

Growth Hormone Deficiency in Adulthood and the Effects of Growth Hormone Replacement: A Review.pdf

The importance of GH throughout adult life is now unequivocally accepted.  GH deficiency is recognized to result in alterations in body composition, physical performance, psychological well-being, and substrate metabolism.  Many of these alterations can be improved or corrected with GH replacement.  The prospect of GH replacement becoming routine, however, does raise a number of issues.
Carroll, P.V., Christ, E.R., Bengtsson, B.A., Carlsson, L., Christiansen, J.S., et al.  (1998). Growth hormone deficiency in adulthood and the effects of growth hormone replacement: A review [Electronic version]. The Journal of Clinical Endocrinology & Metabolism, 83(2), 382-395. Retrieved May 17, 2005.

Effect of Exogenous Testosterone on Prostate Volume, Serum and Semen Prostate Specific Antigen Levels in Healthy Young Men.pdf

According to this study, despite significant elevations in serum total and free testosterone, healthy young men do not demonstrate increased serum or semen PSA levels, or increased prostate volume in response to exogenous testosterone injections.
Cooper, C.S., Perry, P.J., Sparks, A.E., MacIndoe, J.H., Yates, W.R. & Williams, R.D. (1998). Effect of exogenous testosterone on prostate volume, serum and semen prostate specific antigen levels in healthy young men [Electronic version]. The Journal of Urology, 159(2), 441-443. Retrieved October 3, 2005.

The Use of a Sensitive Equilibrium Dialysis Method for the Measurement of Free Testosterone Levels in Healthy, Cycling Women and in Human Immunodeficiency Virus-Infected Women.pdf

The objectives of this study were to develop sensitive assays for the measurement of the low total and free testosterone levels in women to define the range for these hormones during the normal menstrual cycle and assess the total and free testosterone levels in HIV-infected women.
Sinha-Hikim, I., Arver, S., Beall, G., Shen, R., Guerrero, M., Sattler, F., et al. (1998). The use of a sensitive equilibrium dialysis method for the measurement of free testosterone levels in healthy, cycling women and in human immunodeficiency virus-infected women [Electronic version]. The Journal of Clinical Endocrinology and Metabolism, 83(4), 1312-1318. Retrieved October 3, 2005.

No Evidence for Involvement of the Growth Hormone/Insulin-Like Growth Factor-1 Axis in Psoriasis.pdf

Psoriasis patients took part in this study to determine whether altering the growth hormone/insulin-like growth factor-1 axis plays a role in the pathogenesis of psoriasis.
Bjorntorp, E., Wickelgren, R., Bjarnason, R., Swanbeck, G., Carlsson, L.M. & Lindahl, A. (1997). No evidence for involvement of the growth hormone/insulin-like growth factor-1 axis in psoriasis [Electronic version]. The Journal of Investigative Dermatology, 109(5), 661-665. Retrieved May 18, 2005.

Growth Hormone Substitution in Adult Growth Hormone-Deficient Men Augments Androgen Effects on the Skin.pdf

This study included forty-six adult men with childhood-onset of growth hormone deficiency.  Twenty-five of the participants were androgen-deficient and received replacement.  The conclusion of the study was that for growth hormone-deficient men, growth hormone substitution therapy has an auxiliary effect on androgen action in the skin without an increase of the free androgen index.
Blok, G.J., de Boer, H., Gooren, L.J. & van der Veen, E.A. (1997). Growth hormone substitution in adult growth hormone-deficient men augments androgen effects on the skin.  Clinical Endocrinology (Oxford), 47(1), 29-36. Retrieved May 24, 2005.

Does Estrogen Prevent Skin Aging? Results from the First National Health and Nutrition Examination Survey (NHANES I).pdf

Wrinkling, dryness and atrophy were examined in this study of 3875 postmenopausal women.  The goal of the study was to determine the possible effects estrogen has on all three skin conditions.  It was concluded that the results strongly suggest that estrogen use prevents dry skin and wrinkling associated with aging.
Dunn, L.B., Damesyn, M., Moore, A.A., Reuben, D.B. & Greendale, G.A. (1997). Does estrogen prevent skin aging? Results from the First National Health and Nutrition Examination Survey (NHANES I) [Electronic version]. Archives of Dermatology, 133(3), 339-342. Retrieved May 18, 2005.

Age-Related Changes in Facial Skin Contours and Rheology.pdf

This article concludes that aging of facial skin in some ways resembles the features previously reported on sun-protected areas of the forearms.  It also concludes that HRT may have a beneficial effect on slowing the overall aging process without limiting the number and depth of wrinkles.
Henry, F., Pierard-Franchimont, C., Cauwenbergh, G. & Pierard, G.E. (1997). Age-related changes in facial skin contours and rheology [Electronic version]. Journal of the American Geriatrics Society, 45(2), 220-222. Retrieved May 18, 2005.

Does Hormonal Skin Aging Exist? A Study of the Influence of Different Hormone Therapy Regimens on the Skin of Postmenopausal Women Using Non-Invasive Measurement Techniques.pdf

Non-invasive techniques were used to study the skin properties of postmenopausal women.  The study included women using hormone replacement therapy (HRT) and and some who were not being treated with HRT.  It concluded that the women who were receiving HRT had greater skin thickness and causal level than the untreated women.
Callens, A., Vaillant, L., Lecomte, P., Berson, M., Gall, Y. & Lorette, G. (1996). Does hormonal skin aging exist? A study of the influence of different hormone therapy regimens on the skin of postmenopausal women using non-invasive measurement techniques [Electronic version]. Dermatology, 193(4), 289-294. Retrieved May 18, 2005.

Growth Hormone Substitution in Growth Hormone-Deficient Adults: Effects on Collagen Type I Synthesis and Skin Thickness.pdf

The purpose of this study was to prove whether stimulating collagen type I synthesis would be accompanied by a deposition of collagen type I in the skin.  It examined twenty growth hormone-deficient hypopituitary patients for twelve months.
Kann, P., Piepkorn, B., Schehler, B., Lotz, J., Prellwitz, W. & Beyer, J. (1996). Growth hormone substitution in growth hormone-deficient adults: effects on collagen type I synthesis and skin thickness. Experimental and Clinical Endocrinology & Diabetes: Official Journal, German Society of Endocrinology [and] German Diabetes Association, 104(4), 327-333. Retrieved May 18, 2005.

Effect of Hormone Replacement Therapy for Menopause on the Mechanical Properties of Skin.pdf

This study of 114 healthy women, including non-menopausal and menopausal with and without HRT, evaluated the effect of hormone replacement therapy for menopause on the mechanical properties of the skin.  It concluded beneficial effects on some of the properties.
Pierard, G.E., Letawe, C., Dowlati, A. & Pierard-Franchimont, C. (1995). Effect of hormone replacement therapy for menopause on the mechanical properties of skin [Electronic version]. Journal of the American Geriatrics Society, 43(6), 662-665. Retrieved May 18, 2005.

Skin Water-Holding Capacity and Transdermal Estrogen Therapy for Menopause: A Pilot Study.pdf

This study included two groups of fifteen menopausal women.  The purpose was to model and measure the influence of estrogen-transdermal HRT on subtle physiological changes taking place in the epidermis during perimenopause.
Pierard-Franchimont, C., Letawe, C., Goffin, V., Pierard, G.E. (1995). Skin water-holding capacity and transdermal estrogen therapy for menopause: a pilot study [Electronic version]. Maturitas, 22(2), 151-154. Retrieved May 18, 2005.

A Randomized, Double-Blind, Placebo-Controlled Study on the Effect of Conjugated Estrogens on Skin Thickness.pdf

This twelve-month study examines the possible increase in skin thickness in postmenopausal women as a result of being treated with conjugated estrogens.  The results of the study may be beneficial to women who are looking for information regarding the benefits of estrogen replacement therapy.
Maheux, R., Naud, F., Rioux, M., Grenier, R., Lemay, A., Guy, J. & Langevin, M. (1994). A randomized, double-blind, placebo-controlled study on the effect of conjugated estrogens on skin thickness [Electronic version]. American Journal of Obstetrics and Gynecology, 170(2), 642-649. Retrieved May 18, 2005.

Preclinical Hypogonadism in Genetic Hemochromatosis in the Early Stage of the Disease: Evidence of Hypothalamic Dysfunction.pdf

This study examined endocrine functions at baseline and after TRH and LHRH stimulation in a group of 7 young male patients with genetic hemochromatosis (HE) without liver damage (i.e. fibrosis and cirrhosis). In five patients endocrine re-evaluations after complete iron depletion was also performed.
Piperno, A., Rivolta, M.R., D'Alba, R., Fargion, S., Rovelli, F., Ghezzi, A., et al. (1992). Preclinical hypogonadism in genetic hemochromatosis in the early stage of the disease: evidence of hypothalamic dysfunction [Electronic version]. Journal of Endocrinological Investigation, 15(6), 423-428. Retrieved October 26, 2005.

Long-Term Growth Hormone Treatment in Growth Hormone Deficient Adults.pdf

Overall healthy aging adults with a human growth hormone (hGH) deficiency were treated over a lengthy period of time with human growth hormone (hGH) replacement therapy.  The data suggested that long-term human growth hormone (hGH) supplementation and modulation in growth hormone deficient adults had positive physiological effects on features that are often below normal in these patients. The positive changes included an increase in mean muscle volume, strength, and exercise capacity, and decreased body fat. 
Jorgensen, J.O., Pedersen, S.A., Thuesen, L., Jorgensen, J., Moller, J., Muller, J., et al. (1991). Long-term growth hormone treatment in growth hormone deficient adults [Electronic version]. Acta Endocrinol (Copenhagen), 125(5), 449-453. Retrieved July 22, 2003.

Effects of Androgen Treatment in Impotent Men with Normal and Low Levels of Free Testosterone.pdf

The results of this study suggest the presence of a minimum serum fT threshold, lying near the lower normal range, which determines the male sexual function. Moreover, serum fT levels were a more sensitive index than tT for identifying impotent men who can be successfully treated with androgens.
Carani, C., Zini, D., Baldini, A., Della Casa, L., Ghizzani, A. & Marrama, P. (1990). Effects of androgen treatment in impotent men with normal and low levels of free testosterone [Electronic version]. Archives of Sexual Behavior, 19(3), 223-234. Retrieved October 3, 2005.

Hormonal Responses to a Potent Gonadotropin Hormone-Releasing Hormone Antagonist in Normal Elderly Men.pdf

The results of this study demonstrate that the response to Nal-Glu in healthy elderly men is similar to that in younger men, and extended administration of Nal-Glu in elderly men effectively suppresses gonadal and pituitary function. These results suggest that the role of GnRH antagonists in the effective treatment of androgen-dependent disease in the aging male needs to be explored further.
Tenover, J.S., Dahl, K.D., Vale, W.W., Rivier, J.E. & Bremner, W.J. (1990). Hormonal responses to a potent gonadotropin hormone-releasing hormone antagonist in normal elderly men [Electronic version]. The Journal of Clinical Endocrinology and Metabolism, 71(4), 881-888. Retrieved October 3, 2005.

Influence of Phlebotomy Treatment on Abnormal Hypothalamic-Pituitary Function in Genetic Hemochromatosis.pdf

To test the hypothesis that deficiencies in hypothalamic-pituitary function in genetic hemochromatosis result from cellular injury by iron deposits, this study conducted provocative tests in 11 men with genetic hemochromatosis before and after iron depletion by serial phlebotomy and in 10 control subjects. The study concluded that abnormal hypothalamic-pituitary function in genetic hemochromatosis is not substantially improved by iron-depletion therapy.
Lufkin, E.G., Baldus, W.P., Bergstralh, E.J. & Kao, P.C. (1987). Influence of phlebotomy treatment on abnormal hypothalamic-pituitary function in genetic hemochromatosis [Electronic version]. Mayo Clinic Proceedings, 62(6), 473-479. Retrieved October 26, 2005.

Hypogonadotropic Hypogonadism in Hemochromatosis: Recovery of Reproductive Function After Iron Depletion.pdf

This study examined the effect of iron depletion on reproductive function in a 37-yr-old man with hypogonadotropic hypogonadism due to idiopathic hemochromatosis. It was concluded that phlebotomy alone may be adequate treatment for hypogonadotropic hypogonadism in men with hemochromatosis.
Siemons, L.J. & Mahler, C.H. (1987). Hypogonadotropic hypogonadism in hemochromatosis: recovery of reproductive function after iron depletion [Electronic version]. The Journal of Clinical Endocrinology and Metabolism, 65(3), 585-587. Retrieved October 26, 2005.

Testosterone Therapy for Low Sexual Interest and Erectile Dysfunction in Men: A Controlled Study.pdf

The results of this study support previous findings from hypogonadal men that testosterone influences sexual interest but not erectile function, and indicate that increasing plasma testosterone can effect sexual interest even in men with pre-treatment testosterone levels within the normal range.
O'Carroll, R. & Bancroft, J. (1984). Testosterone therapy for low sexual interest and erectile dysfunction in men: a controlled study [Electronic version]. The British Journal of Psychiatry, 145, 146-151. Retrieved October 3, 2005.

Sex Hormones and Skin Collagen Content in Postmenopausal Women.pdf

The implication from the findings in this study is that oestrogen or testosterone, or both, prevents the decrease in skin collagen content during the aging process. It concludes that it protects skin in the same way as it protects bone in menopausal women. Skin biopsy specimens were taken from the participants.
Brincat, M., Moniz, C.F., Studd, J.W., Darby, A.J., Magos, A. & Cooper, D. (1983). Sex hormones and skin collagen content in postmenopausal women [Electronic version]. British Medical Journal, 287(6402), 1337-1338. Retrieved May 18, 2005.

The Nature of Androgen Action on Male Sexuality: A Combined Laboratory-Self-Report Study on Hypogonadal Men.pdf

The data from this study and previous findings lead to the conclusion that the major androgen action on male sexuality involves libido factors (i.e. sexual motivation/interest). Though stimulus-bound erections elicited in the laboratory were not reduced in hypogonadal men, spontaneous (sleep or waking) erections were clearly testosterone dependent.
Kwan, M., Greenleaf, W.J., Mann, J., Crapo, L. & Davidson, J.M. (1983). The nature of androgen action on male sexuality: a combined laboratory-self-report study on hypogonadal men [Electronic version]. The Journal of Clinical Endocrinology and Metabolism, 57(3), 557-562. Retrieved October 3, 2005.

Androgen Replacement with Oral Testosterone Undecanoate in Hypogonadal Men: A Double Blind Controlled Study.pdf

The effects of androgen withdrawal and replacement were investigated in six hypergonadotrophic and six hypogonadotrophic men with hypogonadism. There was a significant fall in sex hormone binding globulin, a rise in oestradiol and no significant change in gonadotrophin concentrations during T.U. administration.
Skakkebaek, N.E., Bancroft, J., Davidson, D.W. & Warner, P. (1981). Androgen replacement with oral testosterone undecanoate in hypogonadal men: a double blind controlled study [Electronic version]. Clinical Endocrinology (Oxford), 14(1), 49-61. Retrieved October 3, 2005.

Gonadal Steroids: Effects on Excitability of Hippocampal Pyramidal Cells.pdf

Electrophysiological field potentials from hippocampal slices of rat brain show sex-linked differences in response to 1 X 10(-10)M concentrations of estradiol and testosterone added to the incubation medium. Slices from male rats show increased excitability to estradiol and not to testosterone. Slices from female rats are not affected by estradiol, but slices from female rats in diestrus show increased excitability in response to testosterone whereas slices from females in proestrus show decreased excitability.
Teyler, T.J., Vardaris, R.M., Lewis, D. & Rawitch, A.B. (1980). Gonadal steroids: effects on excitability of hippocampal pyramidal cells [Electronic version]. Science, 209(4460), 1017-1018. Retrieved October 3, 2005.