limited rest time , high intensity , and competition rate of strenuous sports emphasize on the necessity of following the most suitable approach to manage the functional overload of professional athletes . a proper nutritional strategy is helpful in order to achieve proper recovery , with multiple competing periods and several times per day . the content and time of nutrient consumption impact the resynthesis of fuel supply , reduction of muscle injury , and optimizing the competition performance . liquids are more tolerable in suppressed appetite of instant post - exercise period and they help in cell rehydration and substituting lost electrolytes due to sweating . beverage micro and macronutrient content and their utilization , during or post - exercise period , are effective in fuel restoration . studies reflect that the consumption of carbohydrate - protein beverages during post - exercise recovery periods can facilitate glycogen restore and muscle turnover speed . chocolate milk composition is similar to common sports drinks , and it can enhance blood sugar level , speed of muscle glycogen repletion , and protein turnover . its branched chain amino acids , carbohydrates , electrolytes , and easily absorbed casein and whey protein help athletes muscle stores . dough or persian salty yogurt drink with a consistency similar to milk which contains high amount of whey protein and critical electrolytes such as sodium and calcium can affect athletes performance . moreover , non - alcoholic beer as a source of carbohydrate , minerals , and vitamins is a popular and available supplement fluid . choosing the most proper recovery beverage can be useful for nursing and medical members of sports medicine to guide athletes . in the present study , we compared the effects of dough , non - alcoholic beer , and carbohydrate replacement drink on lactate dehydrogenase enzyme level , f2-isoprostane , lipid , and glucose blood level . the professionals were asked to stop their exercises for 24 hours before initiation of the intervention program . they were also asked to note their food intake in one - day  food recall  questionnaires . five milliliter venous blood was collected , and after 10-min warming up exercises , athletes followed standard protocol of running - based anaerobic sprint test ( rast ) . blood lactate was tested after running the protocol and 1-h post - rast by a calibrated lactometer ( scout company , germany ) . athletes at a 4 day interval , received 500 cc isocaleric beverages as dough , non - alcoholic beer , and chocolate milk . after taking the first beverage then , the participants venous blood was taken ; the other two beverages were consumed following the same guidelines . in other words , 21 participants who enrolled in one experimental study group consumed all three beverages . indirect vo2 max was determined by harvard step test and their 24-h recalls were assessed using a nutritionist iv software ( version 7.0 ; n - squared computing , salam , or , usa ) . serum triglyceride , total cholesterol level , and blood sugar assessed with enzymatic kits ( pars azmoon ins , tehran , iran ) . data were compared between different times using a simple repeated - measures analysis , and post - hoc comparisons were also performed too . all the analyses were done using the statistical package for the social sciences software ( spss inc , chicago , il , usa ) ( version 20 ) . paired t - test and analysis of variance ( anova ) test were also performed . ethics committee of iums approved the study process , and informed consent was gained from all of the subjects . ethics committee of iums approved the study process , and informed consent was gained from all of the subjects . the taekwondo players mean age was 23  2.7 years . levels of lipid profile and blood sugar before and after drinking beverages during pre and post - recovery periods are shown in table 1 . total cholesterol levels decreased after the three intervention periods , however , this reduction was not significant . comparison of total cholesterol change after intervention did not reflect a significant difference ( p > 0.05 ) . plasma concentrations of profile lipids and blood sugar before and after ingestion of beverage plasma triglyceride was lower after dough and carbohydrate replacement drink intake . the mentioned decrease was marginally significant in taekwondo players after dough consumption ( p = 0.076 ) , whereas there was a non - significant difference after carbohydrate drinking periods . in addition , non - alcoholic beer intake non - significantly increased triglyceride level . between groups was marginally significant after consuming non - alcoholic beer ( p = 0.083 ) , however , the mean change of plasma glucose did not show a significant increase for the three beverages . moreover , lactate dehydrogenase level reduced after all the intervention cycles . mean change of this plasma enzyme level was statistically significant after non - alcoholic beer consumption ( p = 0.048 ) . in addition , no significant increase was observed between mean pre and post - recovery f2-isoprostane values and between groups comparison did not show any statistically significant difference ( p > 0.05 ) . participants did not complaint about any side effects . mean and standard error of oxidative stress and muscle damage biomarkers before and after drinking beverages are shown in table 2 . in this study , we compared the effects of various types of beverages including dough , non - alcoholic beer , and carbohydrate - rich beverages on blood sugar , lipid profile , lactate dehydrogenase , and f2-isoprostane levels of elite taekwondo players . findings show that all three beverages at pre- and post - recovery periods enhanced blood sugar and f2-isoprostane levels , whereas these fluids supplements intake decreased plasma total cholesterol and lactate dehydrogenase levels . non - alcoholic beer increases the triglyceride level , and the other liquids lowered plasma triglyceride level . in a study by bishop et al . , plasma glucose levels reduced in the placebo group in comparison to the group that received carbohydrate - rich beverages , both at fatigue and at 1 hour after exercise . it seems that stress hormone release was accompanied with post - exercise blood glucose reduction . moreover , it can balance the fatigue perception , lowering quality of athletes performance . nutrient profile of milk and its products as carbohydrate , whey , electrolytes , and water can be effective on glucose level in athletes recovery periods . the observed effect of fluid drink on triglyceride and total cholesterol levels are comparable with previous findings . in a 6-week intervention trial with fermented milk product , ageraek et al . observed a significant reduction in cholesterol level of 58 healthy participants , whereas plasma triglyceride showed no significant change . cholesterol and triglyceride levels reduction shows an approximately similar trend , however , its strength is affected by sample size of the studied participants . the effect of yogurt , as a milk product , on lowering serum total cholesterol can be explained by its lactobacillus acidophilus content . bioactive compounds , calcium , conjugated linoleic acid fermentation bacteria , and probiotic components can play critical roles in reducing plasma cholesterol and triglyceride levels . exercise leads to a higher lactate dehydrogenase concentration as a converting enzyme with fuel supplying roles and also its level reflected the increased free radical concentration which is caused by stress of sport . in addition , its level affects lactate concentration of athletes muscle and their performance ability . karp et al . on comparing the effects of chocolate milk , fluid replacement drink , and carbohydrate replacement drink consumption in highly - trained cyclists observed increased post - exercise lactate level ; exhaustion time and glycogen - depleting exercise of participants can be managed by milk chocolate beverages . however , the mentioned effects were non - significant in a comparison of within - subject difference in the thomas trial on male trained cyclists . the non - significant within and between comparison of our supplement beverages on f2-isoprostane as a muscle injury and free radical arachidonic acids peroxidation indices can be explained using steensberg findings . they observed that plasma f2-isoprostane level decreases significantly in response to sport stress , however , this reduction is compensated in 1 hour after the recovery period . the trevor trial involving 127 men and women in the age group 30 - 65 years showed that low fat diet containing a daily 3-rich fish meal can reduce cell lipid peroxidation rate and lower urinary f2-isoprostane excretion . this reduction was higher in participants following aerobic exercises in addition to the mentioned diet . lack of reported studies on the effects of fluid supplements on f2-isoprostane level makes more comparison impossible . these findings can help nursing and medical team members of sports medicine to guide elites and professional athletes in rapid and most proper recovery periods . the limitations of our study were small sample size of participants and a before - after study design . moreover , measuring detailed nutrient and electrolyte content of beverages can be effective in our assessment . in regards to the strong points , the present study assessed the effects of isocaloric volume of dough intake in comparison to other available fluid supplements on lipid profile , blood sugar , muscle damage , and oxidative stress markers in professional athletes for the first time . in conclusion , we observed that dough , non - alcoholic beer , and carbohydrate replacement drink consumption at pre- and post - recovery periods can decrease plasma total cholesterol and lactate dehydrogenase level . non - alcoholic beer increases triglyceride level , and the consumption of other liquids was accompanied with lower plasma triglyceride in elite taekwondo players .