faftaq
Z racji tego, iz magnez uczestniczy w przebiegu około 325 rekacji enzymatycznych (w tym w procesach metabolicznych, aktywności neurologicznej, skurczu miesni - w tym mięsnia sercowego) - jego odpowiednia podaż jest niezmiernie istotna nie tylko dla utrzymania sportowej formy, ale również dla zachowania zdrowia. Nawet niewielkie niedobory tego pierwiastka moga byc przyczyną niekorzystnych zmian w naszym organizmie, w tym - pogorszeniu zdolnosci wysiłkowych i regeneracji.
Kwestia dodatkowej suplementacji magnezem - jest kwestią dyskusyjną, zwłaszcza jesli chodzi o osoby o przecietnej aktywnosci, bez wyraźnych oznak niedoboru i zwłaszcza - jesli chodzi o długotrwałe stosowanie. W przypadku ludzi aktywnych - moze istniec zasadnosc stosowania dodatkowych dawek magnezu, o ile nie dostarczaja oni odpowiednij ilosci z diety - co wbrew temu co niektórzy mysla - jest oczywiscie możliwe.
Więcej na temat tego pierwiastka pod linkiem:
https://www.sfd.pl/Magnez_mineral_niezbędny-t313422.html
i anglojęzyczne obszerniejsze opracowanie wraz z bibliografią:
http://www.pponline.co.uk/encyc/supplements-magnesium-sport-4
http://www.pponline.co.uk/encyc/magnesium-it-more-important-athletes-we-thought-39415
_________________________________
BADANIA:
Badanie przeprowadzone z udziałem fighterów wykazało, iz suplementacja magnezem może posrednio miec korzystny wpływ na zdolnosci wysiłkowe poprzez dodatni wplyw magnezu na poziom erytrocytów i hemoglobiny:
Title: Effects of magnesium supplementation on blood parameters of athletes at rest and after exercise.
Personal Authors: Cnar, V., Nzamloglu, M., Mogulkoc, R., Baltac, A. K.
Author Affiliation: High School of Physical Education and Sport, Meram Medical School, Selcuk University, Karaman, Turkey.
Editors: No editors
Document Title: Biological Trace Element Research
Abstract:
The effects of magnesium supplementation on blood parameters were studied during a period of 4 weeks in adult tae-kwon-do athletes at rest and exhaustion. 30 healthy subjects aged 18 to 22 years were included in the study. The subjects were separated into three groups, as follows: Group 1 consisted of subjects who did not train receiving 10 mg/kg/d magnesium. Group 2 included subjects equally supplemented with magnesium and exercising 90-120 min/d for 5 d/wk. Group 3 were subject to the same exercise regime but did not receive magnesium supplements. The leukocyte count (WBC) was significantly higher in groups 1 and 2 than in the subjects who did not receive any supplements (p<0.05). There were no significant differences in the WBC of the two groups under magnesium supplementation. The erythrocyte, haemoglobin, and thrombocyte levels were significantly increased in all groups (p<0.05), but the haematocrit levels did not show any differences between the groups although they were increased after supplementation and exercise. These results suggest that magnesium supplementation positively influences the performance of training athletes by increasing erythrocyte and haemoglobin levels.
__________________________
Wpływ suplementacji cynkiem i magnezem (ZMA), na poziom hormonów anabolicznych, skład ciała i siłę mięsni. Niestety na te parametry suplementacji cynkiem i magnezem wpływu nie miała:
Journal of the International Society of Sports Nutrition 1(2) 12-20, 2004. (www.sportsnutritionsociety.org)
Effects of Zinc Magnesium Aspartate (ZMA) Supplementation on Training Adaptations and Markers of Anabolism and Catabolism
Colin D. Wilborn1, Chad M. Kerksick1, Bill I. Campbell1, Lem W. Taylor1, Brandon M. Marcello1, Christopher J. Rasmussen1, Mike C. Greenwood1, Anthony Almada2, & Richard B. Kreider1
Exercise & Sport Nutrition Lab, Baylor University, Waco, TX1; IMAGINutrition, Laguna Nigel, CA2. Journal of the International Society of Sports Nutrition. 1(2):12-20, 2004. Address correspondence to [email protected].
Received December 18, 2004/Accepted December 28, 2004/Published (online)
ABSTRACT
This study examined whether supplementing the diet with a commercial supplement containing zinc magnesium aspartate (ZMA) during training affects zinc and magnesium status, anabolic and catabolic hormone profiles, and/or training adaptations. Forty-two resistance trained males (27±9 yrs; 178±8 cm, 85±15 kg, 18.6±6% body fat) were matched according to fat free mass and randomly assigned to ingest in a double blind manner either a dextrose placebo (P) or ZMA 30-60 minutes prior to going to sleep during 8-weeks of standardized resistance-training. Subjects completed testing sessions at 0, 4, and 8 weeks that included body composition assessment as determined by dual energy X-ray absorptiometry, 1-RM and muscular endurance tests on the bench and leg press, a Wingate anaerobic power test, and blood analysis to assess anabolic/catabolic status as well as markers of health. Data were analyzed using repeated measures ANOVA. Results indicated that ZMA supplementation non-significantly increased serum zinc levels by 11 - 17% (p=0.12). However, no significant differences were observed between groups in anabolic or catabolic hormone status, body composition, 1-RM bench press and leg press, upper or lower body muscular endurance, or cycling anaerobic capacity. Results indicate that ZMA supplementation during training does not appear to enhance training adaptations in resistance trained populations. Journal of the International Society of Sports Nutrition. 1(2):12-20, 2004.
i pełny tekst dla dociekliwych:
http://www.biomedcentral.com/content/pdf/1550-2783-1-2-12.pdf
_____________________________________
Bardzo ciekawe badanie oceniające zasadnoiść przewlekłego stosowania suplementów magnezowych (organiczna forma, 146mg w przeliczeniu na jony na dobę), przez osoby zdrowe. Mierzono nie tylko poziom mg w osoczu, w erytrocytach, moczu, ale również w komórkach mięsni szkieletowych i układu nerwowego. Wniosek: jedyna istotna róznica - to ilośc wydalanego magnezu z moczem.
Effect of chronic magnesium supplementation on magnesium distribution in healthy volunteers evaluated by 31P-NMRS and ion selective electrodes
C Wary,2 C Brillault-Salvat,1 G Bloch,1 A Leroy-Willig,2 D Roumenov,1 J-M Grognet,1 J H Leclerc,3 and P G Carlier1
1Service Hospitalier Frédéric Joliot, CEA, Orsay, France
2Institut de Myologie, Groupe Hospitalier Pitié-Salpêtrière, Paris, France
3Institut de Mathématiques, Université de Liège, Liège, Belgium
Correspondence: Dr P. G. Carlier, Service Hospitalier Frédéric Joliot, CEA, 4, Place du Général Leclerc, 91401 Orsay Cedex, France. Tel: 33 (0)1 42165894, Fax 33 (0)1 42165887, E-mail: [email protected]
Received March 8, 1999; Accepted July 8, 1999.
Small right arrow pointing to: This article has been cited by other articles in PMC.
* Other Sections▼
o Abstract
o Introduction
o Methods
o Results
o Discussion
o References
Abstract
Aims
The role of magnesium (Mg) intake in the prevention and treatment of diseases is greatly debated. Mg biodistribution after chronic Mg supplementation was investigated, using state-of-the-art technology to detect changes in free ionized Mg, both at extra- and intracellular levels.
Methods
Thirty young healthy male volunteers participated in a randomised, placebo (P)-controlled, double-blind trial. The treated group (MgS) took 12 mmol magnesium lactate daily for 1 month. Subjects underwent in vivo31P-NMR spectroscopy and complete clinical and biological examinations, on the first and last day of the trial. Total Mg was measured in plasma, red blood cells and 24 h urine ([Mg]U). Plasma ionized Mg was measured by ion-selective electrodes. Intracellular free Mg concentrations of skeletal muscle and brain tissues were determined noninvasively by in vivo31P-NMR at 3T. NMR data were automatically processed with the dedicated software MAGAN.
Results
Only [Mg]U changed significantly after treatment (in mmol/24 h, for P, from 4.2±1.4 before to 4.1±1.3 after and, for MgS, from 3.9±1.1 before to 5.1±1.1 after, t =2.15, P =0.04). The two groups did not differ, either before or after the trial, in any other parameter, whether clinical, biological or in relation with the Mg status.
Conclusions
Chronic oral administration of Mg tablets to young healthy male volunteers at usual pharmaceutical doses does not alter Mg biodistribution. This study shows that an adequate and very complete noninvasive methodology is now available and compatible with the organization of clinical protocols which aim at a thorough evaluation of Mg biodistribution.
zachęcam do przejrzenia pełnej wersji badania, gdyż powyżej wklejony skrót jest naprawde ubogi w porównaniu do orginału:
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2014351/
_________________________
Kolejne badanie: brak wpływu suplementacji magnezem (365mg / dobę), na możiwlosci wysiłkowe i regenracje powysiłkową po treningu aorobowym na długich dystansach (maraton 42km).
Int J Sport Nutr. 1992 Jun;2(2):154-64.
Failure of magnesium supplementation to influence marathon running performance or recovery in magnesium-replete subjects.
Terblanche S, Noakes TD, Dennis SC, Marais D, Eckert M.
MRC/UCT Bioenergetics of Exercise Research Unit, University of Cape Town Medical School, Observatory, South Africa.
This study examined the effect of magnesium supplementation on muscle magnesium content, on running performance during a 42-km marathon footrace, and on muscle damage and the rate of recovery of muscle function following the race. Twenty athletes were divided equally into two matched groups and were studied for 4 weeks before and 6 weeks after a marathon in a double-blind trial; the experimental group received magnesium supplement (365 mg per day) and the control group, placebo. Magnesium supplementation did not increase either muscle or serum magnesium concentrations and had no measurable effect on 42-km marathon running performance. Extra magnesium ingestion also had no influence on the extent of muscle damage or the rate of recovery of muscle function. The latter was significantly reduced immediately after the marathon but returned to normal within 1 week. Thus, magnesium supplementation in magnesium-replete subjects did not enhance performance or increase resistance to muscle damage during the race, or the rate of recovery of muscle function following the race.
PMID: 1299490 [PubMed - indexed for MEDLINE]
_________________________
Zmieniony przez - faftaq w dniu 2010-01-22 17:50:35
Kwestia dodatkowej suplementacji magnezem - jest kwestią dyskusyjną, zwłaszcza jesli chodzi o osoby o przecietnej aktywnosci, bez wyraźnych oznak niedoboru i zwłaszcza - jesli chodzi o długotrwałe stosowanie. W przypadku ludzi aktywnych - moze istniec zasadnosc stosowania dodatkowych dawek magnezu, o ile nie dostarczaja oni odpowiednij ilosci z diety - co wbrew temu co niektórzy mysla - jest oczywiscie możliwe.
Więcej na temat tego pierwiastka pod linkiem:
https://www.sfd.pl/Magnez_mineral_niezbędny-t313422.html
i anglojęzyczne obszerniejsze opracowanie wraz z bibliografią:
http://www.pponline.co.uk/encyc/supplements-magnesium-sport-4
http://www.pponline.co.uk/encyc/magnesium-it-more-important-athletes-we-thought-39415
_________________________________
BADANIA:
Badanie przeprowadzone z udziałem fighterów wykazało, iz suplementacja magnezem może posrednio miec korzystny wpływ na zdolnosci wysiłkowe poprzez dodatni wplyw magnezu na poziom erytrocytów i hemoglobiny:
Title: Effects of magnesium supplementation on blood parameters of athletes at rest and after exercise.
Personal Authors: Cnar, V., Nzamloglu, M., Mogulkoc, R., Baltac, A. K.
Author Affiliation: High School of Physical Education and Sport, Meram Medical School, Selcuk University, Karaman, Turkey.
Editors: No editors
Document Title: Biological Trace Element Research
Abstract:
The effects of magnesium supplementation on blood parameters were studied during a period of 4 weeks in adult tae-kwon-do athletes at rest and exhaustion. 30 healthy subjects aged 18 to 22 years were included in the study. The subjects were separated into three groups, as follows: Group 1 consisted of subjects who did not train receiving 10 mg/kg/d magnesium. Group 2 included subjects equally supplemented with magnesium and exercising 90-120 min/d for 5 d/wk. Group 3 were subject to the same exercise regime but did not receive magnesium supplements. The leukocyte count (WBC) was significantly higher in groups 1 and 2 than in the subjects who did not receive any supplements (p<0.05). There were no significant differences in the WBC of the two groups under magnesium supplementation. The erythrocyte, haemoglobin, and thrombocyte levels were significantly increased in all groups (p<0.05), but the haematocrit levels did not show any differences between the groups although they were increased after supplementation and exercise. These results suggest that magnesium supplementation positively influences the performance of training athletes by increasing erythrocyte and haemoglobin levels.
__________________________
Wpływ suplementacji cynkiem i magnezem (ZMA), na poziom hormonów anabolicznych, skład ciała i siłę mięsni. Niestety na te parametry suplementacji cynkiem i magnezem wpływu nie miała:
Journal of the International Society of Sports Nutrition 1(2) 12-20, 2004. (www.sportsnutritionsociety.org)
Effects of Zinc Magnesium Aspartate (ZMA) Supplementation on Training Adaptations and Markers of Anabolism and Catabolism
Colin D. Wilborn1, Chad M. Kerksick1, Bill I. Campbell1, Lem W. Taylor1, Brandon M. Marcello1, Christopher J. Rasmussen1, Mike C. Greenwood1, Anthony Almada2, & Richard B. Kreider1
Exercise & Sport Nutrition Lab, Baylor University, Waco, TX1; IMAGINutrition, Laguna Nigel, CA2. Journal of the International Society of Sports Nutrition. 1(2):12-20, 2004. Address correspondence to [email protected].
Received December 18, 2004/Accepted December 28, 2004/Published (online)
ABSTRACT
This study examined whether supplementing the diet with a commercial supplement containing zinc magnesium aspartate (ZMA) during training affects zinc and magnesium status, anabolic and catabolic hormone profiles, and/or training adaptations. Forty-two resistance trained males (27±9 yrs; 178±8 cm, 85±15 kg, 18.6±6% body fat) were matched according to fat free mass and randomly assigned to ingest in a double blind manner either a dextrose placebo (P) or ZMA 30-60 minutes prior to going to sleep during 8-weeks of standardized resistance-training. Subjects completed testing sessions at 0, 4, and 8 weeks that included body composition assessment as determined by dual energy X-ray absorptiometry, 1-RM and muscular endurance tests on the bench and leg press, a Wingate anaerobic power test, and blood analysis to assess anabolic/catabolic status as well as markers of health. Data were analyzed using repeated measures ANOVA. Results indicated that ZMA supplementation non-significantly increased serum zinc levels by 11 - 17% (p=0.12). However, no significant differences were observed between groups in anabolic or catabolic hormone status, body composition, 1-RM bench press and leg press, upper or lower body muscular endurance, or cycling anaerobic capacity. Results indicate that ZMA supplementation during training does not appear to enhance training adaptations in resistance trained populations. Journal of the International Society of Sports Nutrition. 1(2):12-20, 2004.
i pełny tekst dla dociekliwych:
http://www.biomedcentral.com/content/pdf/1550-2783-1-2-12.pdf
_____________________________________
Bardzo ciekawe badanie oceniające zasadnoiść przewlekłego stosowania suplementów magnezowych (organiczna forma, 146mg w przeliczeniu na jony na dobę), przez osoby zdrowe. Mierzono nie tylko poziom mg w osoczu, w erytrocytach, moczu, ale również w komórkach mięsni szkieletowych i układu nerwowego. Wniosek: jedyna istotna róznica - to ilośc wydalanego magnezu z moczem.
Effect of chronic magnesium supplementation on magnesium distribution in healthy volunteers evaluated by 31P-NMRS and ion selective electrodes
C Wary,2 C Brillault-Salvat,1 G Bloch,1 A Leroy-Willig,2 D Roumenov,1 J-M Grognet,1 J H Leclerc,3 and P G Carlier1
1Service Hospitalier Frédéric Joliot, CEA, Orsay, France
2Institut de Myologie, Groupe Hospitalier Pitié-Salpêtrière, Paris, France
3Institut de Mathématiques, Université de Liège, Liège, Belgium
Correspondence: Dr P. G. Carlier, Service Hospitalier Frédéric Joliot, CEA, 4, Place du Général Leclerc, 91401 Orsay Cedex, France. Tel: 33 (0)1 42165894, Fax 33 (0)1 42165887, E-mail: [email protected]
Received March 8, 1999; Accepted July 8, 1999.
Small right arrow pointing to: This article has been cited by other articles in PMC.
* Other Sections▼
o Abstract
o Introduction
o Methods
o Results
o Discussion
o References
Abstract
Aims
The role of magnesium (Mg) intake in the prevention and treatment of diseases is greatly debated. Mg biodistribution after chronic Mg supplementation was investigated, using state-of-the-art technology to detect changes in free ionized Mg, both at extra- and intracellular levels.
Methods
Thirty young healthy male volunteers participated in a randomised, placebo (P)-controlled, double-blind trial. The treated group (MgS) took 12 mmol magnesium lactate daily for 1 month. Subjects underwent in vivo31P-NMR spectroscopy and complete clinical and biological examinations, on the first and last day of the trial. Total Mg was measured in plasma, red blood cells and 24 h urine ([Mg]U). Plasma ionized Mg was measured by ion-selective electrodes. Intracellular free Mg concentrations of skeletal muscle and brain tissues were determined noninvasively by in vivo31P-NMR at 3T. NMR data were automatically processed with the dedicated software MAGAN.
Results
Only [Mg]U changed significantly after treatment (in mmol/24 h, for P, from 4.2±1.4 before to 4.1±1.3 after and, for MgS, from 3.9±1.1 before to 5.1±1.1 after, t =2.15, P =0.04). The two groups did not differ, either before or after the trial, in any other parameter, whether clinical, biological or in relation with the Mg status.
Conclusions
Chronic oral administration of Mg tablets to young healthy male volunteers at usual pharmaceutical doses does not alter Mg biodistribution. This study shows that an adequate and very complete noninvasive methodology is now available and compatible with the organization of clinical protocols which aim at a thorough evaluation of Mg biodistribution.
zachęcam do przejrzenia pełnej wersji badania, gdyż powyżej wklejony skrót jest naprawde ubogi w porównaniu do orginału:
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2014351/
_________________________
Kolejne badanie: brak wpływu suplementacji magnezem (365mg / dobę), na możiwlosci wysiłkowe i regenracje powysiłkową po treningu aorobowym na długich dystansach (maraton 42km).
Int J Sport Nutr. 1992 Jun;2(2):154-64.
Failure of magnesium supplementation to influence marathon running performance or recovery in magnesium-replete subjects.
Terblanche S, Noakes TD, Dennis SC, Marais D, Eckert M.
MRC/UCT Bioenergetics of Exercise Research Unit, University of Cape Town Medical School, Observatory, South Africa.
This study examined the effect of magnesium supplementation on muscle magnesium content, on running performance during a 42-km marathon footrace, and on muscle damage and the rate of recovery of muscle function following the race. Twenty athletes were divided equally into two matched groups and were studied for 4 weeks before and 6 weeks after a marathon in a double-blind trial; the experimental group received magnesium supplement (365 mg per day) and the control group, placebo. Magnesium supplementation did not increase either muscle or serum magnesium concentrations and had no measurable effect on 42-km marathon running performance. Extra magnesium ingestion also had no influence on the extent of muscle damage or the rate of recovery of muscle function. The latter was significantly reduced immediately after the marathon but returned to normal within 1 week. Thus, magnesium supplementation in magnesium-replete subjects did not enhance performance or increase resistance to muscle damage during the race, or the rate of recovery of muscle function following the race.
PMID: 1299490 [PubMed - indexed for MEDLINE]
_________________________
Zmieniony przez - faftaq w dniu 2010-01-22 17:50:35
Krzysztof Piekarz
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