عنوان

تأثیر مکمل سازي کوتاه و بلند مدت منیزیم بر توان بی‌هوازی، میزان درک درد، شاخص‌های آسیب عضلانی و خستگی در زنان فعال

Reducing or delaying fatigue is one of the basic strategies that has been considered by athletes and coaches. Taking sports supplements can be effective in reducing and delaying fatigue. In this regard, magnesium )Mg2+ (is a cation that is involved in various metabolic and physiological processes related to muscle function. Therefore, the aim of this study was to investigate the effect of short and long-term magnesium supplementation on anaerobic power (average power), pain perception rate (local), muscle damage indices (creatine kinase) and fatigue (lactate) in active women. Methodology: In a quasi-experimental research project among women trained in jumping fitness with an average age is 24 ± 3 years in the city of Tabriz, 15 people were voluntarily selected after homogenization (weight, average anaerobic capacity and serum magnesium level). Subjects were examined in three stages placebo, short and long-term magnesium supplementation with four days rest between each stage (wash out). Subjects were divided into two groups of magnesium supplement and placebo in random, cross-over and double-blind in the placebo and short-term supplementation stages. The night before the first day of the test, the placebo group (n= 7) a 300 mg capsule and the supplement group (n= 8) consumed a 300 mg capsule of magnesium oxide of flour before dinner. After the wash out period, on the second day of the test, the place of the two groups was changed and then all subjects (15 people) entered the long-term supplementation stage (one sachet of 300 mg of magnesium oxide daily - before dinner). On the day of the test, in all three stages placebo, short and long-term magnesium supplementation after 5-10 minutes of warm-up to cause fatigue and muscle damage, three 30-second wingate tests were repeated and active rest intervals of four-minutes were performed and average anaerobic power was recorded in the first performance of the wingate test. At each stage, two blood samples (2 cc) were taken to measure serum lactate, magnesium (six minutes after the third wingate test) and creatine kinase (24 hours after muscle damage) under the same conditions. Perception of quadriceps muscle pain was also measured at each stage immediately after the wingate test and 24 hours after the muscle damage by the visual analogue scale (VAS). Using Shapiro-Wilk test, the normality of data distribution was investigated and then the research hypotheses were tested using analysis of variance with repeated measures and Bonferroni post hoc at the appropriate level of P<0.05.Results: The amount of serum creatine kinase decreased in the long-term magnesium supplementation stage and approached the baseline stage, but its changes were not significant (P<0.05). The amount of serum lactate increased significantly in the placebo, short and long-term magnesium supplementation stages compared to the baseline stage (P<0.05). The amount of pain perception 24 hours after the activity in the long-term magnesium supplementation stage was significantly reduced (P<0.05). Regarding the average anaerobic power, there was no significant difference between different stages of measurement (P<0.05). The amount of Serum magnesium also increased significantly in the long-term magnesium supplementation stage compared to baseline stage (P<0.05). Conclusion: It is recommended that more research be done in this field before prescribing long-term magnesium supplementation for athletes and active people.