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The association between gastrointestinal injury, complaints, and food intake in 60-km ultramarathon runners.

N.F.J. van Venrooij; F.C. Wardenaar; D. Hoogervorst; J.M.G. Senden; Jan-Willem van Dijk; Kristin Jonvik

We aimed to assess the association between gastrointestinal (GI) injury, complaints, and food intake in 60-km ultramarathon runners. Thirty-three ultramarathon runners provided pre- and post-race blood samples for assessment of GI injury by intestinal fatty-acid binding protein (I-FABP), and inflammatory …

2022AlgemeenArtikel

Protein Supplementation Does Not Augment Adaptations to Endurance Exercise Training

Kristin Jonvik; K.J.M. Paulussen; Shiannah Danen; Ingrid Ceelen; A.M. Horstman; F.C. Wardenaar; Luc van Loon; Jan-Willem van Dijk

2019AlgemeenArtikel

Protein Supplementation Does Not Further Augment Physiological Adaptations to Prolonged Endurance Exercise Training

Kristin Jonvik; K.J.M. Paulussen; Shiannah Danen; A.M. Horstman; F.C. Wardenaar; Luc van Loon; Jan-Willem van Dijk

2019AlgemeenArtikel

Habitual Dietary Nitrate Intake in Highly Trained Athletes.

Kristin Jonvik; J. Nyakayiru; Jan-Willem van Dijk; F.C. Wardenaar; Luc van Loon; L.B. Verdijk

Although beetroot juice, as a nitrate carrier, is a popular ergogenic supplement among athletes, nitrate is consumed through the regular diet as well. We aimed to assess the habitual dietary nitrate intake and identify the main contributing food sources in a large group of highly trained athletes. Dutch …

2017AlgemeenArtikel

Nutritional Supplement Use by Dutch Elite and Sub-Elite Athletes: Does Receiving Dietary Counseling Make a Difference?

F.C. Wardenaar; Ingrid Ceelen; Jan-Willem van Dijk; R.W. Hangelbroek; L. Van Roy; B. Van der Pouw; JHM de Vries; M. Mensink; R.F. Witkamp

The use of nutritional supplements is highly prevalent among athletes. In this cross-sectional study, we assessed the prevalence of nutritional supplement use by a large group of Dutch competitive athletes in relation to dietary counseling. A total of 778 athletes (407 males and 371 females) completed …