title: Testosterone levels in athletes at rest and exhaustion: effects of calcium supplementation.
abstract: The effects of 4 weeks of calcium supplementation on free- and total testosterone levels were established in active and sedentary adult males at rest and exhaustion. Thirty healthy male athletes were equally divided into three study groups, as follows: Group 1-non-exercising subjects receiving 35 mg calcium/kg body weight; Group 2-subjects receiving 35 mg calcium/kg body weight undergoing training routines for 90 min/day, 5 days a week and Group 3-subjects undergoing training routines for 90 min/day, 5 days a week. The testosterone levels were determined before and after supplementation, at rest and following a hard training routine. The plasma free- and total testosterone levels increased at exhaustion before and after supplementation relative to resting values (p < 0.05). This was also true when active subjects were compared to inactive subjects (p < 0.05). Our results show that training results in increased testosterone levels in athletes and that the increase is greater if accompanied by calcium supplementation, which may be useful for increasing overall athletic performance.
authors.affiliation: Karaman High School of Physical Education and Sport, Selcuk University, Karaman, Turkey. bsyovedat@yahoo.com.tr
authors.forename: Vedat
authors.initials: V
authors.lastname: Cinar
authors.forename: Abdulkerim Kasim
authors.initials: AK
authors.lastname: Baltaci
authors.forename: Rasim
authors.initials: R
authors.lastname: Mogulkoc
authors.forename: Mehmet
authors.initials: M
authors.lastname: Kilic
mesh_terms: D000293:Adolescent; D000328:Adult; D002125:Calcium Gluconate / Q000008:administration & dosage / Q000494:pharmacology*; D019587:Dietary Supplements; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test; D005221:Fatigue / Q000097:blood*; D006801:Humans; D008297:Male; D012016:Reference Values; D012146:Rest / Q000502:physiology*; D013739:Testosterone / Q000097:blood*
chemical_list: D013739:Testosterone; D002125:Calcium Gluconate