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Open AccessArticle

Effects of an Alkalizing or Acidizing Diet on High-Intensity Exercise Performance under Normoxic and Hypoxic Conditions in Physically Active Adults: A Randomized, Crossover Trial

1
Department of Sports Medicine & Sports Nutrition, Ruhr-University Bochum, Gesundheitscampus Nord 10, 44801 Bochum, Germany
2
Institute of Outdoor Sports and Environmental Science, German Sport University Cologne, 50933 Cologne, Germany
*
Author to whom correspondence should be addressed.
Nutrients 2020, 12(3), 688; https://doi.org/10.3390/nu12030688
Received: 19 January 2020 / Revised: 29 February 2020 / Accepted: 2 March 2020 / Published: 4 March 2020
(This article belongs to the Special Issue Influence of Nutrients on Acid-Base Balance)
Pre-alkalization caused by dietary supplements such as sodium bicarbonate improves anaerobic exercise performance. However, the influence of a base-forming nutrition on anaerobic performance in hypoxia remains unknown. Herein, we investigated the effects of an alkalizing or acidizing diet on high-intensity performance and associated metabolic parameters in normoxia and hypoxia. In a randomized crossover design, 15 participants (24.5 ± 3.9 years old) performed two trials following four days of either an alkalizing (BASE) or an acidizing (ACID) diet in normoxia. Subsequently, participants performed two trials (BASE; ACID) after 12 h of normobaric hypoxic exposure. Anaerobic exercise performance was assessed using the portable tethered sprint running (PTSR) test. PTSR assessed overall peak force, mean force, and fatigue index. Blood lactate levels, blood gas parameters, heart rate, and rate of perceived exertion were assessed post-PTSR. Urinary pH was analyzed daily. There were no differences between BASE and ACID conditions for any of the PTSR-related parameters. However, urinary pH, blood pH, blood bicarbonate concentration, and base excess were significantly higher in BASE compared with ACID (p < 0.001). These findings show a diet-induced increase in blood buffer capacity, represented by blood bicarbonate concentration and base excess. However, diet-induced metabolic changes did not improve PTSR-related anaerobic performance. View Full-Text
Keywords: acid–base balance; potential renal acid load (PRAL); base–forming nutrition; acid-forming nutrition; moderate simulated altitude; hypoxic chamber; sports nutrition; mountain sport disciplines; anaerobic exercise test acid–base balance; potential renal acid load (PRAL); base–forming nutrition; acid-forming nutrition; moderate simulated altitude; hypoxic chamber; sports nutrition; mountain sport disciplines; anaerobic exercise test
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MDPI and ACS Style

Limmer, M.; Sonntag, J.; de Marées, M.; Platen, P. Effects of an Alkalizing or Acidizing Diet on High-Intensity Exercise Performance under Normoxic and Hypoxic Conditions in Physically Active Adults: A Randomized, Crossover Trial. Nutrients 2020, 12, 688. https://doi.org/10.3390/nu12030688

AMA Style

Limmer M, Sonntag J, de Marées M, Platen P. Effects of an Alkalizing or Acidizing Diet on High-Intensity Exercise Performance under Normoxic and Hypoxic Conditions in Physically Active Adults: A Randomized, Crossover Trial. Nutrients. 2020; 12(3):688. https://doi.org/10.3390/nu12030688

Chicago/Turabian Style

Limmer, Mirjam; Sonntag, Juliane; de Marées, Markus; Platen, Petra. 2020. "Effects of an Alkalizing or Acidizing Diet on High-Intensity Exercise Performance under Normoxic and Hypoxic Conditions in Physically Active Adults: A Randomized, Crossover Trial" Nutrients 12, no. 3: 688. https://doi.org/10.3390/nu12030688

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