Zitat:
Effects of a Novel Zinc-Magnesium Formulation on Hormones and Strength
L.R. BRILLA AND VICTOR CONTE
JEPonline, 3(4): 26-36, 2000.
Muscle attributes and selected blood hormones of football players were assessed in response to a nightly supplementation regimen during spring football, over an 8-week period, with pre-post measures. A double-blind randomized study was conducted with ZMA (30 mg zinc monomethionine aspartate, 450 mg magnesium aspartate, and 10.5 mg of vitamin B-6) and placebo (P), n=12 and n=15, respectively. Plasma zinc and magnesium levels were ZMA (0.80 to 1.04 mg/ml; 19.43 to 20.63 mcg/ml ) and P(0.84 to 0.80 mg/ml ; 19.68 to 18.04 mg/ml), respectively (P<0.001). Free testosterone increased with ZMA (132.1 to 176.3 pg/mL),compared to P (141.0 to 126.6 pg/mL) (P<0.001); IGF-I increased in the ZMA group (424.2 to 439.3 ng/mL) and decreased in P (437.3 to 343.3 ng/mL) (P<0.001). Muscle strength via torque measurements and functional power were assessed with a Biodex dynamometer. Differences were noted between the groups (P<0.001): ZMA (189.9 to 211 Nm at 180º/s and 316.5 to 373.7 Nm at 300º/s) and P (204.2 to 209.1 Nm at 180º/s and 369.5 to 404.3 Nm at 300º/s). The results demonstrate the efficacy of a Zn-Mg preparation (ZMA) on muscle attributes and selected hormones in strength-trained, competitive athletes.
Hat man jedoch kein Defizit an den genannten Mineralien, bringt das Supplement wohl nichts (ausser evtl einen besseren Schlaf).
Zitat:
Effects of Zinc Magnesium Aspartate (ZMA) Supplementation on Training Adaptations and Markers of Anabolism and Catabolism
The major findings of this study was that dietary supplementation of a commercially available ZMA supplement resulted in a non-significant 12–17% increase in serum zinc levels but did not appear to effect anabolic or catabolic responses to resistance training, body composition, or training adaptations. These findings do not support contentions that ZMA supplementation during training increases muscle mass and/or enhances training adaptations.
