جستجوی مقالات مرتبط با کلیدواژه « ال آرژنین » در نشریات گروه « تربیت بدنی »

Judo is a sport that imposes significant physiological demands on Judokas. In judo, the production of lactic acid and the decrease in body PH are the causes of damage to sports performance. The purpose of the present study is to investigate the effect of 4 - week of circuit training based on judo techniques with L-arginine supplementation on blood lactic acid level and functional indicatiors of male judokas.

In a semi experimental research project, 20 healthy male judoka with an average age of 17.85 ± 1.77 years were selected by available sampling method. The subjects were randomly divided into two groups of exercise-supplement (10 people) and exercise-placebo (10 people). Two groups performed circuit training based on judo techniques for 20 minutes with an intensity of 85-90% of maximum heart rate as the main training protocol (3 sessions per week for 4 weeks). The subjects of the exercise-supplement group consumed one gram of L-arginine tablets at the rate of 4 grams per day for 4 weeks. ).

A significant decrease in blood lactate level was observed in the exercise-supplement group (P<0.05). A significant increase in aerobic power and anaerobic power, a significant decrease in fatigue index were observed in both groups (P<0.05). These changes were significantly higher in the exercise-supplement group (P<0.05).

Performing judo specific circuit training along with L-arginine supplementation improves aerobic and anaerobic capacity, reduces fatigue index and reduces lactic acid production in male judo kas.

To investigate the effect of L-arginine supplementation on platelet indices in response to a high intensity interval exercise.

Ten healthy overweight young men (BMI=27 ± 1.2 kg/m2) participated voluntarily in this cross-over and double-blind study, and performed a high intensity interval exercise (HIIE) protocol with L-arginine supplementation or placebo, where, two trials were separated by seven days. In each session, the subjects consumed 0.075 g per kg body weight of supplement or placebo which was dissolved in 400 ml of water, and 90 minutes later, performed HIIE as 12 intervals of 3-minute on treadmill (activity: 1-min, 100% of vVO2max, recovery: 2-min, 40% of vVO2max). To measure platelet indices including mean platelet volume (MPV), platelet count (PLT), plateletcrit (PCT) and platelet distribution width (PDW), three blood samples were taken before supplementation and immediately before and after HIIE.

Regardless of the type of supplement, HIIE increased PLT and PCT by 29 and 31%, respectively (P < 001), but did not have a significant effect on MPV and PDW. Furthermore, consumption of L-arginine 90 min prior to HIIE, inhibited PCT (P = 0.043) but had no effect on PLT.

Intermittent nature and recovery periods in HIIE protocol did not significantly increase MPV and PDW in both sessions, which may be a reason for the safety of the HIIE. L-arginine supplementation prior to HIIE only reduced PCT, due to its inability to affect other indices, to achieve more accurate results further studies with more effective doses of supplementation are needed.

Maintaining combat readiness for the military is essential to improving the performance and ability to defend the country. L-Arginine supplementation has a positive effect on physical function. The aim of this study was to evaluate the effect of 12 weeks of L-arginine supplementation on Army Combat Readiness Test (ACRT) and anaerobic power in the military.

Twenty male military volunteers participated in the study and were randomly divided into two groups of 10 L-arginine and placebo. Before and 12 weeks after supplementation, subjects performed the ACRT and anaerobic tests. Data were analyzed using analysis of covariance (ANCOVA). Significance level was considered p≤0.05.

The results showed that L-arginine significantly decreased the ACRT test time (P = 0.001) and significantly increased anaerobic power (P = 0.027) compared to placebo.

This study concludes that 12 weeks of L-arginine supplementation can increase combat power and increase anaerobic power and thus improve physical performance in the military.

The present study was conducted with the aim of comparing the effect of short-term use alone and a combination of L-arginine and L-citrulline supplements on the aerobic and anaerobic capacity of young soccer players.

n this semi-experimental study, which was conducted with a pre-test-post-test design, 60 young male soccer players with an age range of 15 to 18 years were selected as available and in 4 groups of 15 L-arginine supplement, L-citrulline supplement, combined of L-arginine, val-citrulline supplement and placebo. In the pre-test and post-test stages, the aerobic and anaerobic power of the subjects was measured using yo-yo tests and RAST test. The period of supplement consumption was for 7 days. The amount of L-arginine and L-citrulline supplements alone was 2.4 grams per day, and in the combined group, each of the supplements consumed 1.2 grams.

Short-term consumption (7 days) of L-arginine supplement, L-citrulline supplement and a combination of L-arginine and L-citrulline supplement on increasing aerobic power, peak anaerobic power, average anaerobic power, minimum anaerobic power and reducing the fatigue index of football players Young people have a significant effect (P>0.05). Other results indicate the greater effect of the combination of L-arginine and L-citrulline supplements compared to L-arginine and L-citrulline supplements alone in improving the aerobic and anaerobic capacity of young soccer players.

Based on the findings of the present study, it can be concluded that the combined use of L-arginine and L-citrulline supplements can be effective in increasing the aerobic and anaerobic capacity of young football players..

Engaging in exercise increases mitochondrial oxygen consumption, leading to a higher production of free radicals. Given L-arginine's role in boosting the immune response and mitigating the impact of free radicals, this study examined the influence of eight weeks of endurance training along with L-arginine supplementation on GPX and TAC levels in the gastrocnemius muscle of male Wistar rats. The study involved 32 male Wistar rats, aged eight weeks, randomly assigned to four groups: control, exercise training, L-arginine, and exercise training + L-arginine.The training regimen entailed 8weeks of endurance training on a treadmill. The supplement and training+supplement groups were given four grams of L-arginine in 100ml of water. All rats were dissected 48hours after the final training session and after eight hours of fasting. The quadriceps muscle was isolated from the samples, and the GPX and TAC enzyme activities in the skeletal muscle were measured using the spectrophotometric method. Data were analyzed using a one-way analysis of variance test with a significance level set at p<0.05.The study results indicated that the GPX levels in the skeletal muscle of the exercise training+supplement group were significantly higher than those in the training group(p=0.001). However, there was no significant difference in the TAC levels in the skeletal muscle across the study groups (p=0.836). Given the positive impact of L-arginine supplementation alongside intense endurance training on increasing GPX enzyme levels, it's likely that L-arginine supplementation could help prevent the decline of GPX enzyme levels and associated complications during intensive endurance training.

L-arginine is a semi-essential amino acid that can affect some physiological responses, including protein synthesis and carbohydrate and fat metabolism. This study aimed to investigate the acute effect of L-arginine supplementation on fat and carbohydrate metabolism before, during, and after endurance exercise of athletes.

The present study was a single-blind crossover design with one group which were 16 to 20-year-old male football players from Shahrood city. This research was the time series model (including two time series of L-arginine or placebo consumption with an interval of two weeks) with repeated measurements In this way, on the testing day and after measuring the weight and height, the first stage of blood sampling was performed and the gas analyzer test was performed at rest, then the subjects consumed six grams of L-arginine or a placebo along with 400 ml of water. After 45 minutes, the second stage of blood sampling was done and the Bruce test was performed on a treadmill. Immediately after the test, the third stage of blood sampling was done and after 30 minutes of rest, the subjects participated in the last stage of blood sampling. blood samples’ and respiratory gases’ data were analyzed using an analysis of variance with repeated measures and Bonferroni correction.  

Acute consumption of L-arginine supplement decreased maximal fat oxidation and increased maximal carbohydrate oxidation and respiratory exchange ratio after progressive physical activities (P=0.001). In addition, acute L-arginine supplementation increased blood glucose (P=0.001) and glycerol concentrations (P=0.02).

Based on the findings of this study, acute consumption of L-arginine supplement lead to an increase in endurance performance and changes in metabolism during exercise in athletes.

Maintaining combat readiness for the military is essential to improving the performance and ability to defend the country. L-Arginine supplementation has a positive effect on physical function. The aim of this study was to evaluate the effect of 12 weeks of L-arginine supplementation on Army Combat Readiness Test (ACRT) and anaerobic power in the military.

Twenty male military volunteers participated in the study and were randomly divided into two groups of 10 L-arginine and placebo. Before and 12 weeks after supplementation, subjects performed the ACRT and anaerobic tests. Data were analyzed using analysis of covariance (ANCOVA). Significance level was considered p≤0.05.

The results showed that L-arginine significantly decreased the ACRT test time (P = 0.001) and significantly increased anaerobic power (P = 0.027) compared to placebo.

This study concludes that 12 weeks of L-arginine supplementation can increase combat power and increase anaerobic power and thus improve physical performance in the military.

The present study was designed to investigate the effects of L-Arginine supplementation on fat and carbohydrate metabolism during high intensity interval exercise (HIIE) in overweight individuals.

Ten male overweight students performed two HIIE trials including 10 intervals of 3 min encompassed 1 min running at 100% of vVO2max and 2 min active recovery at 40% of vVO2max. In each session subjects consumed either supplement or placebo 90 min prior to exercise. Before and after supplementation and immediately after exercise glucose, insulin, non-esterified free fatty acid (NEFA) and triglyceride were measured. Oxygen consumption and exhaled carbon dioxide were collected to calculate fat and carbohydrate oxidation.

There were no significant differences between two trials for glucose, insulin, NEFA, triglyceride and fat oxidation (P>0.05). However, carbohydrate oxidation rate was significantly different between two sessions (p < 0.05). In addition, glucose and carbohydrate oxidation were significantly increased following HIIE irrespective of L-Arginine supplementation (p < 0.05).

Based on the findings of present study it could be concluded that L-Arginine supplementation leads to increases in carbohydrate oxidation during HIIE in overweight men, but has no effect on resting at metabolism.

L-citrulline has recently reported as a more effective supplement for promoting intracellular nitric oxide (NO) production and also performance as compared to L-arginine. The aim of present research was to evaluate the effect of one-week of Citrulline-Malate, L-arginine supplementation and their combination on metabolic stress, blood pressure and exercise performance in male wrestlers.

In  this semi-experimental study, 40 male wrestlers (aged 19-25 years; weight 60-90 kg; body fat percent 12-20) in a randomized and double-blind design were divided into four equal as citrulline-malate (Cit; 4g/days), L-arginine (L-Arg; 4g/days), their combination (2g/days L-Arg + 2g/days Cit) and placebo (P) groups. Before and after supplementation period, all subjects were participated in a competition like wrestling. After the initial blood sampling, the wrestlers performed the wrestling-like competitive test, and then the secondary blood sample was taken five minutes after the test. After one week of supplementation, exercise protocols and blood sampling are performed in the same way. Plasma lactate, urea and both aerobic and anaerobic power were analyzed. Change any of the parameters (mean and standard deviation) during four stages and also between groups were determined by repeated measure analysis of variance and Bonferoni post hoc tests, at  the significance level  of .

Urea and lactate concentration after one week supplementation of Citrulline-Malate and combination of Citrulline-Malate with L-arginine were significantly increased and decreased, respectively (p < 0.05). Moreover, anaerobic power was significantly increased following the combined supplementation (p < 0.05). Also, all three types of intervention could increase aerobic capacity, resting NO levels and NO response to competition like wrestling (p < 0.05). In addition, none of the above interventions had no effect on blood pressure(p>0.05).

It seems that combination of Citrulline-Malate and L-arginine supplementation improve performance via reduce exercise-induced metabolic stress and fatigue index (lactate).

The aim of this study was to investigate the effect of six weeks of High intensity interval training (HIIT) program and citrulline malate (CM) supplement on nitric oxide levels and exercise performance in elite wrestlers.

In a randomized, placebo-controlled design, 28 elite males’ wrestlers (age, 21.9±2.4 y; height 174.5±3.8 cm) were randomly assigned to CM+training, placebo+training and training, while also all groups participating in 6 weeks of HIIT based on wrestling techniques. Participants completed testing sessions for body composition and aerobic and anaerobic tests before and after 6 weeks of HIIT program. Venous blood samples were obtained before and after 6 weeks.

Nitric Oxide level after six weeks of HIIT and CM supplementation showed significant increase comparing to placebo+training (P=0.001) and training (P=0.035) groups. There is no significant difference between other groups for NO (P> 0.05). There was a significant difference between upper body anaerobic power (peak power, Mean power and fatigue index) of CM group and placebo group (P=0.22), and there was no significant difference between the other groups (P>0.05). Among all body composition data after six week HIIT just FFM of CM+training group showed significant increase comparing placebo and training group (P<0.05).

Daily CM supplementation during six weeks of HIIT training increases serum NO levels and upper body anaerobic power in elite male wrestlers comparing HIIT alone.

The aim of this research was to evaluate the effect of one-week supplementation of citrulline-malate, L-arginine and their combination on growth hormone concentration and metabolic responses in male wrestlers. In this semi-experimental study, 40 male wrestlers (aged 19-25 years; weight 60-90 kg; body fat percent 12-20%) in a randomized and double-blind design were divided in four equal citrulline-malate (Cit; 4g/days), L-arginine (Arg; 4g/days), their combination (2g/days Arg + 2g/days Cit) and placebo (P) groups. Before and after supplementation period, all subjects were participated in a competition like wrestling. Blood samples were obtained in the 4 phases: one hour before and immediately after two competition like wrestling protocols. Plasma growth hormone (GH), glycerol, fat free acid (FFA), and glucose were analyzed. Change any of the parameters (mean and standard deviation) of four stages and between groups is determined by Analysis of variance (ANOVA) with repeated measurement and post hoc tests, respectively. The significance level was set at p<0.05. The findings of present study showed that GH and lactate concentration were significantly increased after one week supplementation of arginine, citrulline-malate and combination of citrulline-malate with L-arginine. Also, it can be concluded that the one week citrulline-malate with L-arginine supplementation is more effective than the citrulline-malate or L-arginine supplementation to prevent the exercise-induced decrease in some glucose levels. Therefore, it seems that Cit supplementation week more effectively than L-arginine for exercise induced increased of growth hormone, glycerol, FFA and preventing of decreases glucose levels.

The purpose of this study was to investigate the effect of L-arginine supplementation on the nAchR response in hind limb of old male rats after exhaustive acute exercise. For this purpose, 32 Wistar rats (age: 22 months, weight: 380±20gr) were selected. After one week of familiarization with laboratory environment, they were randomly divided into four groups consisted of:1) L-arginine supplement with one session of exhaustive endurance exercise, 2) L-arginine supplement 3) exercise and 4) control group. For the supplementation groups, they consumed water containing 2.5% L-arginine for two weeks. In the exercise day, the training groups performed an exhaustive running with 30 meter per minute speed and 5-degree incline, equivalent to approximately 75-80% of their VO2max. Immediately and four hours after exercise they anesthesia and sampling was performed from EDL and Soleus muscles. Then, for statistical analysis of the datas, the one-way ANOVA was used. data of this study illustrate that nAchR level in L-arginine supplement, significantly was higher than control group in EDL and Soleus muscles (p

Aim: The aim of the present investigation is evaluate the effect of L- Arginine supplements on the oxidative and nitrosative stress in liver of rats following acute exercise on a treadmill.
Thirty two male Vistar rats (160-210 g) were randomly divided into four groups: control (C); L-Arg treatment (Arg); exhaustive exercise (E); and exhaustive exercise with L-Arg treatment (E Arg). E and Eʸ groups performed a 1 hour acute running test, or until exhaustion on a treadmill (16-26 m/min) and Arg and Eʸ groups treated orally with the L-Arg (2% diet, for 30 days). Sampling was performed 1 hour after exercise. Nitric oxide production was evaluated by measuring nitrite formation, using Griess reagent. oxidant-Antioxidant’s ratio was measured as TOS/ TAC levels.
According to the means of the oxidant-antioxidant’s balance (E)=0.91±0.12, (SCʸ)=0.92 0.04 and (Eʸ)=0.91±0.09, TOS/TAC decreased in (E), (SCʸ) and (Eʸ) groups compared with control group (SC); however, this decrease was not significant. And the results showed nitric oxide in (SC) group (mean=9.01 6.31 ) was more than other groups, but there was no significant change in there.
The results of the present study didn’t show existence of oxidative-nitrosative stress and supplementation effect in muscle 1 h after acute exercise.