نشریه پژوهش در تغذیه ورزشی
پیاپی 4 (زمستان 1401)

Weightlifting is a sport in which muscle strength plays an important role. Athletes use ergogenic aids to increase their muscle strength. Among supplements that improve strength performance of athletes are caffeine & arginine alpha glutarate. aim of present study was to investigate effect of acute caffeine and arginine alpha-actoglutarate consumption on the performance of elite weightlifters.

10 elite weightlifters participated in a crossover design that was implemented in four phases, one week apart. The subjects were selected by purposive sampling. In first week, one hour before performing the exercises, they consumed a placebo of 5 mg per kilogram of body weight. In second week, one hour before training, they consumed 5 mg of caffeine per kilogram of body weight. In third week, 4 grams of arginine alpha actoglutarate was consumed one hour before. In the fourth week, they took caffeine and arginine alpha-actoglutarate supplements one hour before. data were analyzed by repeated analysis variance and Bonferroni's post hoc test at a significance level of P>0.05.

The findings of the present study showed that in the comparison of three types of interventions, consumption of AAKG compared to caffeine ((P=0.002)) and the combination of caffeine and AAKG had a significant decrease in movement (P=0.01). In the comparison of three types of intervention, the consumption of AAKG compared to caffeine (P=0.001) and the combination of caffeine and AAKG had a significant decrease in movement two times (P=0.023)

weightlifting athletes can use caffeine and arginine alphaglutarate supplements to improve their performance

The information about the effect of ginseng supplementation on physiological responses in debilitating activities is unclear. The aim of this study was to investigate the effect of short-term ginseng consumption on maximal oxygen consumption, blood lactate and time to exhaustion in male athletes.

In this quasi-experimental study, which was performed as two blinds and crossovers, 10 male athletes (age: 18 ± 24 years) participated in a single group model with supplementation and placebo. Subjects took two 250 mg ginseng capsules and 6 mg of starch per kilogram of body weight daily as a placebo for one week and then participated in the Bruce Exhaustion Test. Information on maximal oxygen consumption, blood lactate and arrival time to exhaustion in the laboratory .Data were analyzed using paired t-test and covariance test at a significance level of 0.05.

The results showed that the maximum oxygen consumption (p = 0.01) and the time to reach exhaustion (p = 0.02) were significantly increased compared to the placebo group. There was significant decrease in blood lactate compared to the placebo group (p = 0.03).

Short-term use of gensing supplementation may improve exercise performance and reduce fatigue. It is recommended that athletes take 500 mg of their sexing supplement daily to increase aerobic capacity.

The purpose of this research was to investigate the anti-inflammatory and antioxidant role of medicinal plants in exercise and recovery. Scientific evidence supports the positive effect of regular physical activity on health, with a strong emphasis on exercise intensity. The evidence shows that intense physical activities, in addition to creating tissues, by producing free radicals and oxidative stress in active agents, because damage caused by oxidative stress and reduce sports performance in athletes. Several studies show that nutritional interventions and the use of antioxidant supplements can provide a protective role against oxidative stress caused by sports activities. The efficient use of these supplements is recommended to athletes based on data that is aimed at improving sports performance. Some supplements may lead to better adaptation and improvement of the body's anti-inflammatory and antioxidant system during exercise or recovery, which helps in better performance of athletes during training or sports competitions. In this review study, in addition to investigating inflammatory and oxidative factors during sports activities, the effects of several nutritional supplements in line with anti-inflammatory and antioxidant effects in exercise and recovery are presented.

The integration of strength training and dietary strategies is recognized as a potent method to decrease body weight and body fat mass. This meta-analysis aims to explore the combined effect of strength training and a low-carbohydrate diet on reducing body fat mass in adults.

We conducted a comprehensive search of the Web of Science, Scopus, PubMed, Magiran, and SID databases with no publication year restrictions up until September 2023. This meta-analysis evaluated the combined influence of strength training and a low-carbohydrate diet on body fat mass in adults. The weighted mean difference (WMD) and 95% confidence interval were calculated using a random effects model to determine the effect size. Publication bias was assessed through visual interpretation of a funnel plot.

A total of 15 studies, involving 390 adult participants, were included in this meta-analysis. The results indicated that strength training combined with a low-carbohydrate diet significantly reduced body fat mass with a large effect size in adults compared to the control group (p=0.03, WMD=0.97 (-1.89 to -0.05)). The results of subgroup analysis based on the subjects' active status showed that resistance training and low-carbohydrate diet for non-athletes (p=0.5, WMD=0.88) did not lead to a significant reduction in body fat mass in adults, but for athlete subjects (p=0.05, WMD=-0.98) was close to significance.

According to the findings of this meta-analysis, a low-carbohydrate diet, in comparison to a standard diet, has a beneficial impact on reducing body fat mass in individuals who partake in strength training.

Endurance training interventions with nutritional factors may affect physiological adaptations. The combined effect of endurance exercise and alkaline water has been less investigated on the antioxidant and peroxidative status of inactive obese people. Therefore, the aim of this study was to investigate the effect of eight weeks of endurance training with alkaline water consumption on antioxidant status and lipid peroxidation in inactive obese men.

The current research was semi-experimental. The statistical population included healthy men with an average age of 33.27±3.11 years and an average weight of 94.16±2.91 kg, of which 56 people participated in this research. The subjects were randomly divided into four groups: endurance training, endurance training with alkaline water, alkaline water and control. The exercise intervention was implemented three sessions a week for eight weeks. Alkaline water (pH 9.5) was received at the rate of 10 kg/mL after each training session. Before and after the last training session, antioxidant and peroxide indicators were measured.

The results showed that eight weeks of endurance training caused a significant increase in SOD (11.69%, p=0.210) and a significant decrease in MDA (4.41%, p=0.037). The highest percentage of significant changes in the serum values of SOD (16.08%, p=0.014) and MDA (5.88%, p=0.016) were assigned to the exercise group with alkaline water.Alkaline water alone did not cause significant changes in the serum values of SOD (3.94%, p=0.059) and MDA (1.45%, p=0.143).

The combined effect of endurance exercise and alkaline water improves the redox status in inactive obese men.

Success in sports activities performance depends on many factors, including nutritional status of athletes therefor the aim of this study was to evaluate the effect of 4 weeks of glutamine supplementation on factors related to physical fitness in young wrestling.

In this experimental study, 16 teenage wrestlers (18.85±1.6 in age range) participated and were randomly divided into two control (n=8) and experimental (n=8) groups. Both groups participated in their normal exercises, then the experimental group received glutamine supplement and the control group received placebo (maltodextrin) during 4 weeks. Before and after the research protocol, indicators related to physical fitness (strength, maximum oxygen consumption and speed) were evaluated. In the following, the obtained information was evaluated using independent t-test and significance level of p≤0.05 and Spss statistical software.

The findings showed that the strength of the lower and upper body muscles (p=0.04), as well as the maximum aerobic power (p=0.001) of the wrestlers in the experimental group was significantly higher than the control group. However, there was no significant difference (p=0.4) in the speed of the two groups.

It seems that the consumption of glutamine amino acid supplement has an effect on the performance of physical activities and improves performance of strength and maximum oxygen consumption.