Muscle attributes of football players were assessed in response to their adherence to a nightly supplementation regimen during spring football, over an 8-week period. A double-blind randomized study was conducted with ZMA (30 mg zinc monothione aspartate, 450 mg magnesium aspartate, and 10.5 mg vitamin B-6) and placebo (P), n=12 and n=15 respectively. Body weights were 99.1 kg and 99.0 kg, pre-post in ZMA, and 95.9 kg and 95.6 kg, pre-post in P. Diet records (3-day) showed that mean values of selected nutrients exceeded the RDA for Zn (17.0 +/− 7.4 mg), Mg (539 +/− 272 mg), and B-6 (3.6 +/− 1.6 mg). Blood values were assessed: Zn pre values at 0.804 mcg/mL for ZMA and 0.836 for P, with post values at 1.038 (ZMA) and 0.799 (P); Mg pre values at 19.4 mcg/mL for (ZMA) and 19.7 for (P), with post values at 20.6 (ZMA) and 18.0 (P). Changes were significant (p<0.05) and indicated a positive effect of the supplement on blood parameters. Muscle strength and functional power were assessed with a BIODEX dynamometer. A repeated measure MANOVA showed an interaction effect because of a discrepancy in pre test values, with P starting higher than ZMA. When an ANCOVA was applied, there were significant differences noted between the groups (P<0.05) with the ZMA having greater increases (189.9 to 211.8 Nm at 180 deg per sec and 316.5 to 373.7 at 300 deg per sec) than P (204.2 to 209.1 Nm at 180 deg per sec and 369.5 to 404.3 at 300 deg per sec). These results demonstrate the efficacy of a special Zn-Mg preparation (ZMA) on muscle attributes in strength-trained, competitive athletes.
American College of Sports Medicine; 46th Annual Meeting; Washington State; Convention & Trade Center; June 2-5, 1999
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B-34 POSTER NUTRITION, DRUGS & PERFOR