This article was downloaded by: [Deakin University Library] On: 12 March 2015, At: 06:58 Publisher: Routledge Informa Ltd Registered in England and Wales Registered Number: 1072954 Registered office: Mortimer House, 37-41 Mortimer Street, London W1T 3JH, UK
Journal of the American College of Nutrition Publication details, including instructions for authors and subscription information: http://www.tandfonline.com/loi/uacn20
Effect of magnesium supplementation on strength training in humans. a
a
L R Brilla & T F Haley a
Exercise and Sport Science Laboratory, Western Washington University, Bellingham 98225. Published online: 02 Sep 2013.
To cite this article: L R Brilla & T F Haley (1992) Effect of magnesium supplementation on strength training in humans., Journal of the American College of Nutrition, 11:3, 326-329, DOI: 10.1080/07315724.1992.10718233 To link to this article: http://dx.doi.org/10.1080/07315724.1992.10718233
PLEASE SCROLL DOWN FOR ARTICLE Taylor & Francis makes every effort to ensure the accuracy of all the information (the “Content”) contained in the publications on our platform. However, Taylor & Francis, our agents, and our licensors make no representations or warranties whatsoever as to the accuracy, completeness, or suitability for any purpose of the Content. Any opinions and views expressed in this publication are the opinions and views of the authors, and are not the views of or endorsed by Taylor & Francis. The accuracy of the Content should not be relied upon and should be independently verified with primary sources of information. Taylor and Francis shall not be liable for any losses, actions, claims, proceedings, demands, costs, expenses, damages, and other liabilities whatsoever or howsoever caused arising directly or indirectly in connection with, in relation to or arising out of the use of the Content. This article may be used for research, teaching, and private study purposes. Any substantial or systematic reproduction, redistribution, reselling, loan, sub-licensing, systematic supply, or distribution in any form to anyone is expressly forbidden. Terms & Conditions of access and use can be found at http:// www.tandfonline.com/page/terms-and-conditions
Effect of Magnesium Supplementation on Strength Training in Humans Lorraine R. Brilla, PhD, FACN, and Timothy F. Haley, BS, RN Exercise and Sport Science Laboratory, Western Washington University, Bellingham, Washington (L.R.B.), and Harborview Medical Center, Seattle (T.F.H.)
Downloaded by [Deakin University Library] at 06:58 12 March 2015
Key words: magnesium, strength training, quadriceps torque This study investigated the effects of dietary magnesium (Mg) on strength development during a double-blind, 7-week strength training program in 26 untrained subjects (14 = control, C and 12 = Mg supplemented, M), 18-30 years old. Subjects' 3-day diet records were analyzed and Mg content was calculated. C received a placebo and M received a supplement (Mg oxide) to bring Mg intake, including diet, to 8 mg/kg body weight/day. Body composition was assessed with bioelectrical impedance. Pre and post quadriceps torque (T) measurements were made with an Orthotron at 120 deg/ sec. Each subject performed three sets of 10 reps, leg press and leg extension, three times/week. Both groups gained strength, however, results indicated a significant (p < 0.05) increase for the M group compared to the C group in absolute T, relative T adjusted for body weight (T/BWT), and relative T adjusted for lean body mass (T/LBM) when pre values were used as the covariate. M was consistently greater than C (T: 211 vs 174 Nm; T/BWT: 3.07 vs 2.58 Nm/kg; T/LBM: 3.84 vs 3.36 Nm/kg). Conclusion: Significant differences in T gains after strength training were demonstrated in M vs C. Mg's role may be at the ribosomal level in protein synthesis. Abbreviations: BIA = bioelectrical impedance, BWT = body weight, C = control group, LBM = lean body mass, M = magnesium-supplemented group, Mg = magnesium, MVC = maximal voluntary contraction, RDA = Recommended Dietary Allowance, T = torque
INTRODUCTION
olysis have been noted [16]. DNA transcription, RNA aggregation, and protein synthesis all depend on optimal Mg concentration [17,18]. From the available evidence it is hypothesized that suboptimal Mg levels may negatively affect protein metabolism, and therefore abate the in creased protein density noted with strength training, thus resulting in diminished strength gains in a structured ex ercise program. The purpose of this investigation was to determine the effect of Mg supplementation on strength gains in previously untrained subjects who engaged in a strength training program.
It has been demonstrated that 75 % of the US population may have magnesium (Mg) intakes
Journal of the American College of Nutrition Publication details, including instructions for authors and subscription information: http://www.tandfonline.com/loi/uacn20
Effect of magnesium supplementation on strength training in humans. a
a
L R Brilla & T F Haley a
Exercise and Sport Science Laboratory, Western Washington University, Bellingham 98225. Published online: 02 Sep 2013.
To cite this article: L R Brilla & T F Haley (1992) Effect of magnesium supplementation on strength training in humans., Journal of the American College of Nutrition, 11:3, 326-329, DOI: 10.1080/07315724.1992.10718233 To link to this article: http://dx.doi.org/10.1080/07315724.1992.10718233
PLEASE SCROLL DOWN FOR ARTICLE Taylor & Francis makes every effort to ensure the accuracy of all the information (the “Content”) contained in the publications on our platform. However, Taylor & Francis, our agents, and our licensors make no representations or warranties whatsoever as to the accuracy, completeness, or suitability for any purpose of the Content. Any opinions and views expressed in this publication are the opinions and views of the authors, and are not the views of or endorsed by Taylor & Francis. The accuracy of the Content should not be relied upon and should be independently verified with primary sources of information. Taylor and Francis shall not be liable for any losses, actions, claims, proceedings, demands, costs, expenses, damages, and other liabilities whatsoever or howsoever caused arising directly or indirectly in connection with, in relation to or arising out of the use of the Content. This article may be used for research, teaching, and private study purposes. Any substantial or systematic reproduction, redistribution, reselling, loan, sub-licensing, systematic supply, or distribution in any form to anyone is expressly forbidden. Terms & Conditions of access and use can be found at http:// www.tandfonline.com/page/terms-and-conditions
Effect of Magnesium Supplementation on Strength Training in Humans Lorraine R. Brilla, PhD, FACN, and Timothy F. Haley, BS, RN Exercise and Sport Science Laboratory, Western Washington University, Bellingham, Washington (L.R.B.), and Harborview Medical Center, Seattle (T.F.H.)
Downloaded by [Deakin University Library] at 06:58 12 March 2015
Key words: magnesium, strength training, quadriceps torque This study investigated the effects of dietary magnesium (Mg) on strength development during a double-blind, 7-week strength training program in 26 untrained subjects (14 = control, C and 12 = Mg supplemented, M), 18-30 years old. Subjects' 3-day diet records were analyzed and Mg content was calculated. C received a placebo and M received a supplement (Mg oxide) to bring Mg intake, including diet, to 8 mg/kg body weight/day. Body composition was assessed with bioelectrical impedance. Pre and post quadriceps torque (T) measurements were made with an Orthotron at 120 deg/ sec. Each subject performed three sets of 10 reps, leg press and leg extension, three times/week. Both groups gained strength, however, results indicated a significant (p < 0.05) increase for the M group compared to the C group in absolute T, relative T adjusted for body weight (T/BWT), and relative T adjusted for lean body mass (T/LBM) when pre values were used as the covariate. M was consistently greater than C (T: 211 vs 174 Nm; T/BWT: 3.07 vs 2.58 Nm/kg; T/LBM: 3.84 vs 3.36 Nm/kg). Conclusion: Significant differences in T gains after strength training were demonstrated in M vs C. Mg's role may be at the ribosomal level in protein synthesis. Abbreviations: BIA = bioelectrical impedance, BWT = body weight, C = control group, LBM = lean body mass, M = magnesium-supplemented group, Mg = magnesium, MVC = maximal voluntary contraction, RDA = Recommended Dietary Allowance, T = torque
INTRODUCTION
olysis have been noted [16]. DNA transcription, RNA aggregation, and protein synthesis all depend on optimal Mg concentration [17,18]. From the available evidence it is hypothesized that suboptimal Mg levels may negatively affect protein metabolism, and therefore abate the in creased protein density noted with strength training, thus resulting in diminished strength gains in a structured ex ercise program. The purpose of this investigation was to determine the effect of Mg supplementation on strength gains in previously untrained subjects who engaged in a strength training program.
It has been demonstrated that 75 % of the US population may have magnesium (Mg) intakes
