Medizinische Universität Graz Austria/Österreich - Forschungsportal - Medical University of Graz
Gewählte Publikation:
SHR Neuro Krebs Kardio Lipid Stoffw Microb
Westmoreland, D; Porta, S; Bacher, H; Knapp, M; Spencer, K; Merback, J; Leitner, T.
The effect of magnesium supplementation on exercise-induced plasma magnesium shifts and lactic acid accumulation in female youths
TRACE ELEM ELECTROLYTES. 2004; 21: 95-98.
Doi: 10.5414/TEP21095
Web of Science
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- Führende Autor*innen der Med Uni Graz
- Porta Sepp
- Co-Autor*innen der Med Uni Graz
- Bacher Heinz
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- Abstract:
- Ten female subjects of a boarding school in Austria were given meals with a high Mg2+ and Ca2+ content for a 10-day period. Before and after the diet change, subjects completed a standardized, 9-minute cycle ergometry program that consisted of 3 x 3-minute intervals with power outputs of 50, 100, and 150 watts. Blood samples were taken before and after ergometry. Mg2+ consumption was calculated at only 257 mg/day, nevertheless, it resulted in a 9.3% increase in plasma Mg2+ (p < 0.01). Before the diet change, subjects experienced small increases or decreases in plasma Mg2+ in response to exercise, their increase in lactate was strongly correlated with the Mg2+ shift (p < 0.01). Their basal Mg2+ levels were not correlated with the Mg2+ shift. After the diet change, plasma Mg2+ change (A value) after exercise was 13 times greater, the correlation between the Mg2+ shift and lactate was not significant any more (p > 0.1), and basal Mg2+ levels were strongly correlated with the Mg2+ shift (p < 0.01). These results indicate that the aerobic benefits of Mg2+ supplementation may be limited to hypomagnesic individuals, in addition, they may explain why studies have reported differences in the direction and magnitude of the Mg2+ shift induced by exercise.
- Find related publications in this database (Keywords)
- blood Ca2+
- blood Mg2+
- exercise physiology
- mineral enriched diet