Effect of milk consumption on healthy young men rehydration and endurance performance after dehydration due to intermittent exercise in warm environmental condition

Background and Objective: Rapid and adequate rehydration is important for many athletes, especially those taking multiple sessions of exercise each day, or those involved in weight category sports. The macronutrient and electrolyte concentration of the fluid ingested following exercise can affect the amount retained within the body can influence hydration status. This study was done to compare the effect of milk consumption on healthy young men rehydration and endurance performance after dehydration due to intermittent exercise in warm environmental condition

Methods: In this quasi-experimental study, the labroratory protocol was carried out by ten young healthy men in three sessions within one week intervals. Participants were on drinking regiment including water, low-fat milk, and powerade. Urine samples were collected pre-exercise, post-exercise, post-drinking and 1, 2 and 3 hours over recovery. Exercise capacity test commenced within 10 min after 3h recovery. This was undertaken in warm environmental condition at a power output corresponding to 70% V02 max. Exercise continued until voluntary exhaustion. Heart rate and RPE were recorded at 5 min intervals throughout exercise

Results: Pre-exercise urine specific gravity value was not different between the milk and the, powerade and the water groups. Total urine output was significantly reduced in the milk group in compared to powerade and the water consumption [P<0.05]. At the end of the study, net fluid balance was significantly positive in milk group compared to powerade and water groups [P<0.05]. Time of exhaustion on the exercise capacity test [70% V02 max] was significantly more in milk in comparision with powerade group [P<0.05]

Conclusion: Low-fat milk is more effective at rehydrating compared to water and exercise capacity in intermittent activity of heat in healthy young men

[Effect of 8-week walking program on serum lipoprotein [a] concentration in non-athlete menopausal women]

Lipoprotein [a] [Lp[a]] is a new cardiovascular risk factor and its concentration increase cardiovascular diseases, while physical activity decrease cardiovascular diseases. This study intend to investigate the effect of eight week walking program on lipoprotein [a] concentration in non-athlete Iranian menopausal women. Twenty two healthy menopause women of 47-55 year of age any specific disorder were enrolled in this study. The subjects randomly divided into experimental and control groups. Anthropometric characteristics including height, weight, body mass index [BMI], body fat percent and Waist-to-Hip ratio [WHR] and serum lipoprotein on fasting were measured pre and post-walking program. The data were compared using independent t-test, U mann witny and pearson correlation coefficient was used for assessement of relation between lipoprotein [a] with anthropometric indexes. According to these results, there was a significant reduction of serum lipoprotein [a] [pre test12.5 +/- 4/1; post test 10.5 +/- 3md], WHR, BMI and body fat percent prior and after the training in experimental group [P<0.05] while non significant changes was observed in control group. Also, there was non significant relationship between lipoprotein [a] with Anthropometric indexes. This study revealed that 8-week walking program had useful effects on menopausal women' serum lipoprotein [a] concentration, WHR, BMI and body fat percent