Thomas A. Lloyd All publications ( 63 ) Petit MA. Beck TJ. Lin HM. Bentley C. Legro RS. Lloyd T. Femoral bone structural geometry adapts to mechanical loading and is influenced by sex steroids: the Penn State Young Women's Health Study. 2004 Sep. Bone. 35(3):750-9. National Institute of Arthritis and Musculoskeletal and Skin Diseases National Center for Research Resources National Institute of Child Health and Human Development Lloyd T. Petit MA. Lin HM. Beck TJ. Lifestyle factors and the development of bone mass and bone strength in young women. 2004 Jun. J Pediatr. 144(6):776-82. National Center for Research Resources National Institute of Child Health and Human Development Lloyd T. Phillips BR. Aber RC. Factors that influence doctors' participation in clinical research. 2004 Aug. Med Educ. 38(8):848-51. National Heart, Lung, and Blood Institute Legro RS. Lin HM. Demers LM. Lloyd T. Urinary free cortisol increases in adolescent caucasian females during perimenarche. 2003 Jan. J Clin Endocrinol Metab. 88(1):215-9. National Institute of Child Health and Human Development National Center for Research Resources Lloyd T. Lin HM. Eggli DF. Dodson WC. Demers LM. Legro RS. Adolescent Caucasian mothers have reduced adult hip bone density. 2002 Jan. Fertil Steril. 77(1):136-40. National Center for Research Resources National Institute of Child Health and Human Development Lloyd T. Beck TJ. Lin HM. Tulchinsky M. Eggli DF. Oreskovic TL. Cavanagh PR. Seeman E. Modifiable determinants of bone status in young women. 2002 Feb. Bone. 30(2):416-21. National Center for Research Resources National Institute of Child Health and Human Development Lloyd T. Lin HM. Matthews AE. Bentley CM. Legro RS. Oral contraceptive use by teenage women does not affect body composition. 2002 Aug. Obstet Gynecol. 100(2):235-9. National Institute of Child Health and Human Development National Center for Research Resources Lloyd T. Taylor DS. Calcium intake and peak bone mass. 2001. J Am Med Womens Assoc. 56(2):49-52, 72. Lloyd T. Taylor DS. Lin HM. Matthews AE. Eggli DF. Legro RS. Oral contraceptive use by teenage women does not affect peak bone mass: a longitudinal study. 2000 Oct. Fertil Steril. 74(4):734-8. National Institute of Child Health and Human Development National Center for Research Resources Lloyd T. Don't ignore it and it will go away. 2000 Mar 30-Apr 5. Nurs Times. 96(13):46-7. Legro RS. Lin HM. Demers LM. Lloyd T. Rapid maturation of the reproductive axis during perimenarche independent of body composition. 2000 Mar. J Clin Endocrinol Metab. 85(3):1021-5. National Institute of Child Health and Human Development National Center for Research Resources Cusatis DC. Chinchilli VM. Johnson-Rollings N. Kieselhorst K. Stallings VA. Lloyd T. Longitudinal nutrient intake patterns of US adolescent women: the Penn State Young Women's Health Study. 2000 Mar. J Adolesc Health. 26(3):194-204. National Center for Research Resources National Institute of Child Health and Human Development Lloyd T. Chinchilli VM. Johnson-Rollings N. Kieselhorst K. Eggli DF. Marcus R. Adult female hip bone density reflects teenage sports-exercise patterns but not teenage calcium intake. 2000 Jul. Pediatrics. 106(1 Pt 1):40-4. National Center for Research Resources Public Health Service Lloyd T. Johnson-Rollings N. Eggli DF. Kieselhorst K. Mauger EA. Cusatis DC. Bone status among postmenopausal women with different habitual caffeine intakes: a longitudinal investigation. 2000 Apr. J Am Coll Nutr. 19(2):256-61. Lloyd T. Rollings NJ. Kieselhorst K. Eggli DF. Mauger E. Dietary caffeine intake is not correlated with adolescent bone gain. 1998 Oct. J Am Coll Nutr. 17(5):454-7. National Center for Research Resources National Institute of Child Health and Human Development Lloyd T. Chinchilli VM. Eggli DF. Rollings N. Kulin HE. Body composition development of adolescent white females: the Penn State Young Women's Health Study. 1998 Oct. Arch Pediatr Adolesc Med. 152(10):998-1002. National Center for Research Resources National Institute of Child Health and Human Development Halbert DR. Lloyd T. Rollings N. Kowalski W. Mauger E. Hormone replacement therapy usage: a 10 year experience of a solo practitioner. 1998 May 20. Maturitas. 29(1):67-73. Lloyd T. Chinchilli VM. Rollings N. Kieselhorst K. Tregea DF. Henderson NA. Sinoway LI. Fruit consumption, fitness, and cardiovascular health in female adolescents: the Penn State Young Women's Health Study. 1998 Apr. Am J Clin Nutr. 67(4):624-30. National Center for Research Resources National Institute of Child Health and Human Development Lloyd T. Eggli DF. Miller KL. Eggli KD. Dodson WC. Radiation dose from DXA scanning to reproductive tissues of females. 1998. J Clin Densitom. 1(4):379-83. Lloyd T. Rollings N. Eggli DF. Kieselhorst K. Chinchilli VM. Dietary caffeine intake and bone status of postmenopausal women. 1997 Jun. Am J Clin Nutr. 65(6):1826-30. Chinchilli VM. Martel JK. Kumanyika S. Lloyd T. A weighted concordance correlation coefficient for repeated measurement designs. 1996 Mar. Biometrics. 52(1):341-53. National Institute on Aging National Institute of Child Health and Human Development Lloyd T. Martel JK. Rollings N. Andon MB. Kulin H. Demers LM. Eggli DF. Kieselhorst K. Chinchilli VM. The effect of calcium supplementation and Tanner stage on bone density, content and area in teenage women. 1996. Osteoporos Int. 6(4):276-83. National Institute of Child Health and Human Development Andon MB. Lloyd T. Matkovic V. Supplementation trials with calcium citrate malate: evidence in favor of increasing the calcium RDA during childhood and adolescence. 1994 Aug. J Nutr. 124(8 Suppl):1412S-1417S. National Institute on Aging National Institute of Child Health and Human Development National Center for Research Resources Lloyd T. Andon MB. Rollings N. Martel JK. Landis JR. Demers LM. Eggli DF. Kieselhorst K. Kulin HE. Calcium supplementation and bone mineral density in adolescent girls. 1993 Aug 18. JAMA. 270(7):841-4. National Institute of Child Health and Human Development Lloyd T. Eggli DF. Measurement of bone mineral content and bone density in healthy twelve-year-old white females. 1992 Jun. J Nucl Med. 33(6):1143-5. National Institute of Child Health and Human Development Lloyd T. Rollings N. Andon MB. Demers LM. Eggli DF. Kieselhorst K. Kulin H. Landis JR. Martel JK. Orr G. et al. Determinants of bone density in young women. I. Relationships among pubertal development, total body bone mass, and total body bone density in premenarchal females. 1992 Aug. J Clin Endocrinol Metab. 75(2):383-7. National Institute of Child Health and Human Development Lloyd T. Schaeffer JM. Walker MA. Demers LM. Urinary hormonal concentrations and spinal bone densities of premenopausal vegetarian and nonvegetarian women. 1991 Dec. Am J Clin Nutr. 54(6):1005-10. Pedersen AB. Bartholomew MJ. Dolence LA. Aljadir LP. Netteburg KL. Lloyd T. Menstrual differences due to vegetarian and nonvegetarian diets. 1991 Apr. Am J Clin Nutr. 53(4):879-85. Segal S. Lloyd T. Houts PS. Stillman PL. Jungas RL. Greer RB. The association between students' research involvement in medical school and their postgraduate medical activities. 1990 Aug. Acad Med. 65(8):530-3. Leuenberger PK. Buchanan JR. Myers CA. Lloyd T. Demers LM. Determination of peak trabecular bone density: interplay of dietary fiber, carbohydrate, and androgens. 1989 Nov. Am J Clin Nutr. 50(5):955-61. Lloyd T. Buchanan JR. Ursino GR. Myers C. Woodward G. Halbert DR. Long-term oral contraceptive use does not affect trabecular bone density. 1989 Feb. Am J Obstet Gynecol. 160(2):402-4. Kulin HE. Frontera MA. Demers LM. Bartholomew MJ. Lloyd TA. The onset of sperm production in pubertal boys. Relationship to gonadotropin excretion. 1989 Feb. Am J Dis Child. 143(2):190-3. Lloyd T. Sherrard MG. Hulse SF. Lingle VA. Burnside JW. Designing and implementing a computer learning center in a college of medicine. 1989. J Biocommun. 16(2):2-6. Lloyd T. Myers C. Buchanan JR. Demers LM. Collegiate women athletes with irregular menses during adolescence have decreased bone density. 1988 Oct. Obstet Gynecol. 72(4):639-42. Buchanan JR. Myers C. Lloyd T. Greer RB. Early vertebral trabecular bone loss in normal premenopausal women. 1988 Oct. J Bone Miner Res. 3(5):583-7. Buchanan JR. Myers C. Lloyd T. Leuenberger P. Demers LM. Determinants of peak trabecular bone density in women: the role of androgens, estrogen, and exercise. 1988 Dec. J Bone Miner Res. 3(6):673-80. Lloyd T. Buchanan JR. Bitzer S. Waldman CJ. Myers C. Ford BG. Interrelationships of diet, athletic activity, menstrual status, and bone density in collegiate women. 1987 Oct. Am J Clin Nutr. 46(4):681-4. Buchanan JR. Myers C. Greer RB. Lloyd T. Varano LA. Assessment of the risk of vertebral fracture in menopausal women. 1987 Feb. J Bone Joint Surg Am. 69(2):212-8. Lloyd T. Garry FL. Manders EK. Marks JG. The effect of age and hair colour on human hairbulb tyrosinase activity. 1987 Apr. Br J Dermatol. 116(4):485-9. National Institute of General Medical Sciences Wild RA. Buchanan JR. Myers C. Lloyd T. Demers LM. Adrenal androgens, sex-hormone binding globulin and bone density in osteoporotic menopausal women: is there a relationship? 1987 Apr. Maturitas. 9(1):55-61. Lloyd T. Triantafyllou SJ. Baker ER. Houts PS. Whiteside JA. Kalenak A. Stumpf PG. Women athletes with menstrual irregularity have increased musculoskeletal injuries. 1986 Aug. Med Sci Sports Exerc. 18(4):374-9. Stumpf PG. Byers G. Lloyd T. Effect of vaginal contraceptive sponges on growth of toxic shock syndrome-associated Staphylococcus aureus in vitro. 1986 Apr. Contraception. 33(4):395-9. Stumpf PG. Lloyd T. In vitro penetration of human sperm into bovine cervical mucus: effects of sperm washing and exposure to low temperature. 1985 Jan. Obstet Gynecol. 65(1):42-5. Lorenz RP. Picchio LP. Weisz J. Lloyd T. The relationship between reproductive performance and blood pressure in the spontaneously hypertensive rat. 1984 Nov 1. Am J Obstet Gynecol. 150(5 Pt 1):519-23. National Institute of General Medical Sciences Stumpf PG. Garry F. Lloyd T. Effects of temperature on in vitro penetration of human sperm into bovine cervical mucus. 1984 Nov. J Reprod Med. 29(11):833-6. Lloyd T. Food restriction increases life span of hypertensive animals. 1984 Jan 23. Life Sci. 34(4):401-7. National Institute of General Medical Sciences Lloyd T. Waldman CD. The antihypertensive effect of U-0521 (3',4'-dihydroxy-2-methylpropiophenone). 1982 Nov 8. Life Sci. 31(19):2121-7. National Institute of General Medical Sciences Hersey RM. Lloyd T. MacLusky NJ. Weisz J. The catechol estrogen, 2-hydroxyestradiol-17 alpha, is formed from estradiol-17 alpha by hypothalamic tissue in vitro and inhibits tyrosine hydroxylase. 1982 Nov. Endocrinology. 111(5):1734-6. National Institute of Child Health and Human Development Lloyd T. Boyd B. Walega MA. Ebersole BJ. Weisz J. A comparison of 2-hydroxyestradiol and U-0521 (3'4'-dihydroxy-2-methylpropiophenone, Upjohn) as in situ and in vitro inhibitors of tyrosine hydroxylase. 1982 Apr. J Neurochem. 38(4):948-54. National Institute of General Medical Sciences National Institute of Child Health and Human Development Lloyd T. Walega MA. Purification of tyrosine hydroxylase by high-pressure liquid chromatography. 1981 Sep 15. Anal Biochem. 116(2):559-63. National Institute of General Medical Sciences Ikeno T. Dickens G. Lloyd T. Guroff G. The receptor-mediated activation of tyrosine hydroxylation in the superior cervical ganglion of the rat. 1981 May. J Neurochem. 36(5):1632-40. Hersey RM. Gunsalus P. Lloyd T. Weisz J. Catechol estrogen formation by brain tissue: a comparison of the release of tritium from [2-3H]estradiol with [6,7-3H]2-hydroxyestradiol formation from [6,7-3H]estradiol by rabbit hypothalami in vitro. 1981 Dec. Endocrinology. 109(6):1902-11. National Institute of Child Health and Human Development Lloyd T. Ebersole BJ. Feedback inhibition of tyrosine hydroxylase from five regions of rat brain by 2-hydroxyestradiol and dihydroxyphenylalanine. 1980 Mar. J Neurochem. 34(3):726-31. Lloyd T. The effects of phosphatidylinositol on tyrosine hydroxylase. Stimulation and inactivation. 1979 Aug 10. J Biol Chem. 254(15):7247-54. Lloyd T. Ebersole BJ. Schneider FH. Stimulation of tyrosine hydroxylase activity in cultured mouse neuroblastoma cells by monocarboxylic acids. 1978 Jun. J Neurochem. 30(6):1641-3. Lloyd T. Weisz J. Direct inhibition of tyrosine hydroxylase activity by catechol estrogens. 1978 Jul 25. J Biol Chem. 253(14):4841-3. Lloyd T. Weisz J. Breakefield XO. The catechol estrogen, 2-hydroxyestradiol, inhibits catechol-O-methyltransferase activity in neuroblastoma cells. 1978 Jul. J Neurochem. 31(1):245-50. Weisz J. O'Brien LV. Lloyd T. Methylation of estradiol-17 beta by a partially purified preparation of bovine pineal hydroxy-indole-O-methyltransferase. 1978 Jan. Endocrinology. 102(1):330-3. Hoeldtke R. Lloyd T. Kaufman S. An immunochemical study of the induction of tyrosine hydroxylase in rat adrenal glands. 1974 Apr 23. Biochem Biophys Res Commun. 57(4):1045-53. Lloyd T. Kaufman S. Production of antibodies to bovine adrenal tyrosine hydroxylase: cross-reactivity studies with other pterin-dependent hydroxylases. 1973 Jul. Mol Pharmacol. 9(4):438-44. Friedman PA. Lloyd T. Kaufman S. Production of antibodies to rat liver phenylalanine hydroxylase. Cross-reactivity with other pterin-dependent hydroxylases. 1972 Sep. Mol Pharmacol. 8(5):501-10. Lloyd T. Weiner N. Isolation and characterization of a tyrosine hydroxylase cofactor from bovine adrenal medulla. 1971 Nov. Mol Pharmacol. 7(6):569-80. Lloyd T. Markey S. Weiner N. Identification of 2-amino-4-hydroxy substituted pteridines by gas-liquid chromatography and mass spectrometry. 1971 Jul. Anal Biochem. 42(1):108-12.