Annemarthe Wijnen

Annemarthe Wijnen is a MSc-student in Nutrition & Health at Wageningen University. She is specializing in the field of nutritional physiology and health status.

She has a BSc-degree in Nutrition & Dietetics. During her BSc-minor, she focused on the field of nutrition & sports. For her BSc-thesis she, together with two fellow students, investigated the association of the oral anti-diabetic drug, metformin with vitamin B12 and folate deficiencies in Dutch elderly. She also designed a course for dieticians about metformin and B-vitamins. For this thesis she was nominated for the Nestlé Price for Dietetics.

Annemarthe has always been interested in science and sports nutrition. The effect of nutrition on sports performance can be huge and still many topics are yet to be researched.

Personally she likes running, spinning and race cycling, but also cooking is one of her favourite hobbies.

For her MSc-thesis she will, together with Jora Steennis and Marco Mensink, perform PRooST (Post-exercise Rehydration STudy). Her focus will be on the effect of beer consumption on the fluid balance after exercise-induced dehydration.  She will measure and compare the fluid balance of healthy, active men after drinking different rehydration beverages.

Everyone knows the phenomenon of the “third half” after playing team sports. Many people decide to drink some beers with teammates right after a match or training. Is this a healthy thing to do? After exercise you need to refill the losses in carbohydrates, electrolytes and especially fluids. There are reasons to believe that beer might prevent the body to rehydrate fully, because of the diuretic effect of alcohol. The scientific evidence is however limited. Only a few studies have researched the effect of alcohol on post-exercise rehydration.  These studies suggest that when the body is dehydrated, the diuretic effect of alcohol is blunted. There are reasons to believe that beer could serve as a rehydration beverage. It contains carbohydrates and electrolytes.

PRooST is a cross-over intervention study with five trials. Participants will cycle until they have lost 1% of their bodyweight. Afterwards they receive a rehydration beverage and hydration markers will be measured multiple times, such as urine osmolality.

The focus lies on the effect of different types of commercially available beer (lager, low-alcohol and non-alcoholic) on the fluid balance after exercise-induced rehydration, but also compares these with water and a rehydration drink. This makes the results of PRooST applicable to real life situations.