BIOLOGICAL TRACE ELEMENT RESEARCH, cilt.140, sa.1, ss.18-23, 2011 (SCI-Expanded)
Effects of Magnesium Supplementation on Testosterone
Levels of Athletes and Sedentary Subjects at Rest
and after Exhaustion
Vedat Cinar • Yahya Polat • Abdulkerim Kasim Baltaci • Rasim Mogulkoc
Abstract
This study was performed to assess how 4 weeks of magnesium supplementation
and exercise affect the free and total plasma testosterone levels of sportsmen practicing tae
kwon do and sedentary controls at rest and after exhaustion. The testosterone levels were
determined at four different periods: resting before supplementation, exhaustion before
supplementation, resting after supplementation, and exhaustion after supplementation in three
study groups, which are as follows: Group 1—sedentary controls supplemented with 10 mg
magnesium per kilogram body weight. Group 2—tae kwon do athletes practicing 90-
120 min/day supplemented with 10 mg magnesium per kilogram body weight. Group 3—tae
kwon do athletes practicing 90-120 min/day receiving no magnesium supplements. The free
plasma testosterone levels increased at exhaustion before and after supplementation
compared to resting levels. Exercise also increased testosterone levels relative to sedentary
subjects. Similar increases were observed for total testosterone. Our results show that
supplementation with magnesium increases free and total testosterone values in sedentary
and in athletes. The increases are higher in those who exercise than in sedentary individuals.
Keywords
Exercise • Magnesium supplementation • Free and total testosterone