title: Acute hormonal responses in elite junior weightlifters.
abstract: To date, no published studies have demonstrated resistance exercise-induced increases in serum testosterone in adolescent males. Furthermore, few data are available on the effects of training experience and lifting performance on acute hormonal responses to weightlifting in young males. Twenty-eight junior elite male Olympic-style weightlifters (17.3 +/- 1.4 yrs) volunteered for the study. An acute weightlifting exercise protocol using moderate to high intensity loads and low volume, characteristic of many weightlifting training sessions, was examined. The exercise protocol was directed toward the training associated with the snatch lift weightlifting exercise. Blood samples were obtained from a superficial arm vein at 7 a.m. (for baseline measurements), and again at pre-exercise, 5 min post-, and 15 min post-exercise time points for determination of serum testosterone, cortisol, growth hormone, plasma beta-endorphin, and whole blood lactate. The exercise protocol elicited significant (p less than or equal to 0.05) increases in each of the hormones and whole blood lactate compared to pre-exercise measures. While not being significantly older, subsequent analysis revealed that subjects with greater than 2 years training experience exhibited significant exercise-induced increases in serum testosterone from pre-exercise to 5 min post-exercise (16.2 +/- 6.2 to 21.4 +/- 7.9 nmol.l-1), while those with less than or equal to 2 years training showed no significant serum testosterone differences. None of the other hormones or whole blood lactate appear to be influenced by training experience.(ABSTRACT TRUNCATED AT 250 WORDS)
authors.affiliation: Center for Sports Medicine, Pennsylvania State University, University Park 16802.
authors.forename: W J
authors.initials: WJ
authors.lastname: Kraemer
authors.forename: A C
authors.initials: AC
authors.lastname: Fry
authors.forename: B J
authors.initials: BJ
authors.lastname: Warren
authors.forename: M H
authors.initials: MH
authors.lastname: Stone
authors.forename: S J
authors.initials: SJ
authors.lastname: Fleck
authors.forename: J T
authors.initials: JT
authors.lastname: Kearney
authors.forename: B P
authors.initials: BP
authors.lastname: Conroy
authors.forename: C M
authors.initials: CM
authors.lastname: Maresh
authors.forename: C A
authors.initials: CA
authors.lastname: Weseman
authors.forename: N T
authors.initials: NT
authors.lastname: Triplett
mesh_terms: D000293:Adolescent; D000704:Analysis of Variance; D013006:Growth Hormone / Q000097:blood; D006728:Hormones / Q000097:blood*; D006801:Humans; D006854:Hydrocortisone / Q000097:blood; D007773:Lactates / Q000097:blood; D019344:Lactic Acid; D008297:Male; D009132:Muscles / Q000502:physiology; D010806:Physical Education and Training; D012044:Regression Analysis; D013739:Testosterone / Q000097:blood; D013997:Time Factors; D014891:Weight Lifting; D001615:beta-Endorphin / Q000097:blood
chemical_list: D006728:Hormones; D007773:Lactates; D019344:Lactic Acid; D013739:Testosterone; D001615:beta-Endorphin; D013006:Growth Hormone; D006854:Hydrocortisone