Effects of Monomeric and Oligomeric Flavanols on Kidney Function, Inflammation and Oxidative Stress in Runners: A Randomized Double-Blind Pilot Study

• Published in: Nutrients Vol. 12; no. 6; p. 1634
• Main Authors: Semen, Khrystyna O, Weseler, Antje R, Janssen, Marcel J W, Drittij-Reijnders, Marie-José, le Noble, Jos L M L, Bast, Aalt
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 01.06.2020; MDPI
• Subjects: Albumins; Anti-inflammatory agents; Antioxidants; Athletes; Athletic Performance; Bark; Blood flow; Creatine; Dietary Supplements; Double-Blind Method; Double-blind studies; exercise; Flavanols; Flavonoids - administration & dosage; Flavonoids - pharmacology; Hematuria; Humans; Ibuprofen; Inflammation; Inflammation - etiology; Inflammation - prevention & control; Injury prevention; Interleukin 8; Kidney - blood supply; Kidney Diseases - etiology; Kidney Diseases - prevention & control; kidney function; Kidneys; Lipocalin; Malondialdehyde; Marathons; Musculoskeletal Pain - etiology; Musculoskeletal Pain - prevention & control; neutrophil gelatinase-associated lipocalin; Nonsteroidal anti-inflammatory drugs; Oxidative stress; Oxidative Stress - drug effects; Pain; Phytotherapy; Pilot Projects; Pine trees; Pinus - chemistry; Pinus pinaster; Plant Extracts - administration & dosage; Plant Extracts - isolation & purification; Plant Extracts - pharmacology; Randomization; Regional Blood Flow - drug effects; Running - physiology; Seeds; Vitis - chemistry; Vitis vinifera; United States > US; Netherlands; Japan; flavanols; exercise; ibuprofen; kidney function; inflammation; neutrophil gelatinase-associated lipocalin
• ISSN: 2072-6643; 2072-6643
• DOI: 10.3390/nu12061634

Nonsteroidal anti-inflammatory drugs are frequently used by athletes in order to prevent musculoskeletal pain and improve performance. In combination with strenuous exercise, they can contribute to a reduction of renal blood flow and promote development of kidney damage. We aimed to investigate whether monomeric and oligomeric flavanols (MOF) could reduce the severity of kidney injuries associated with the intake of 400-mg ibuprofen followed by the completion of a half-marathon in recreational athletes. In this double-blind, randomized study, the original MOF blend of extracts from grape seeds ( L.) and pine bark ( L.) or placebo were taken for 14 days preceding the ibuprofen/half-marathon. Urine samples were collected before and after the ibuprofen/half-marathon, and biomarkers of kidney injury, inflammation and oxidative stress were assessed. Intake of MOF significantly reduced the incidence of post-race hematuria ( 0.0004) and lowered concentrations of interleukin (IL)-6 in the urine ( 0.032). Urinary neutrophil-associated lipocalin, creatine, albumin, IL-8 and malondialdehyde tended to decrease. The supplementation with MOF in recreational runners appears to safely preserve kidney function, reduce inflammation and promote antioxidant defense during strenuous exercise and intake of a single dose of ibuprofen.