Rahavard Salamat Journal

Introduction: Water and electrolytes can maintain thermal balance of the body at encounter to heat. The purpose of the present study was to determine the effect of different drinks on changes in physiological indexes in laboratory conditions.

Materials and Methods: This clinical trial study was conducted on 13 male students  under  hot and dry Laboratory condition (40 ° C, humidity 30%). People in 3 steps within 2 hours  ate the interferences water, lemonade and lemon juice in the amount of 400 cc at 4 times. . Every 10 minutes, heart rate, oral temperature and skin temperature were measured. At the end of encounter, urine samples were taken to determine the temperature and turbidity, as well as the sweat was calculated.Repeated Measures ANOVA and LSD(Least significant difference) was used to analyze the data.

Results: The results showed that the average temperature of the urine (p=0.155), turbidity of urine (p=0.171), heart rate during activity (p=0.345) and severity sweating (p=0.988) no significant difference but mean heart rate in the third minute from every 10 minutes rest (p=0.04), oral temperature (p=0.007) and skin temperature (p=0.005) were significantly different.

Conclusion: The effect of lemon juice compared to water lemonade and water was major to reduce physiological heat strain.