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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

The impact of beetroot juice supplementation on muscular endurance, maximal strength and countermovement jump performance.

Kristin Jonvik; D. Hoogervorst; H.B. Peelen; Mark de Niet; L.B. Verdijk; Luc van Loon; Jan-Willem van Dijk

Purpose: Dietary nitrate has been shown to enhance muscle contractile function and has, therefore, been linked to increased muscle power and sprint exercise performance. However, the impact of dietary nitrate supplementation on maximal strength, performance and muscular endurance remains to be established. …

2021AlgemeenArtikel

Do Paralympic athletes suffer from brittle bones?

Vera Weijer; Kristin Jonvik; Luc van Loon; T Raastad; Jan-Willem van Dijk

2021AlgemeenConferentiebijdrage

A Nitrate-Rich Vegetable Intervention Elevates Plasma Nitrate and Nitrite Concentrations and Reduces Blood Pressure in Healthy Young Adults

Cindy van der Avoort; Kristin Jonvik; J. Nyakayiru; Luc van Loon; M. Hopman; L.B. Verdijk

2020AlgemeenArtikel

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

Sucrose but Not Nitrate Ingestion Reduces Strenuous Cycling-induced Intestinal Injury.

Kristin Jonvik; K. Lenaerts; J.S.J. Smeets; J.J. Kolkman; Luc van Loon; L.B. Verdijk

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

The Effect of Beetroot Juice Supplementation on Dynamic Apnea and Intermittent Sprint Performance in Elite Female Water Polo Players

Kristin Jonvik; Jan-Willem van Dijk; J.M.G. Senden; Luc van Loon; L.B. Verdijk

2018AlgemeenArtikel

Repeated-sprint performance and plasma responses following beetroot juice supplementation do not differ between recreational, competitive and elite sprint athletes

Kristin Jonvik; J. Nyakayiru; Jan-Willem van Dijk; K. Maase; S.B. Ballak; J.M.G. Senden; Luc van Loon; L.B. Verdijk

2018AlgemeenArtikel

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

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