Trial reportMedicine and science in sports and exercise2026
Opposing Effects of Dietary Nitrate on Muscle Contractile Function in Fast and Slow Human Muscles.
Trial report in Medicine and science in sports and exercise, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Authors and funding
5 authors.
Funding
Abstract
purposeIncreasing nitric oxide bioavailability via nitrate (NO 3- ) ingestion enhances muscle contractility, which may be due to phosphorylation of the regulatory light chain of myosin. If so, there should be an interaction between NO 3- supplementation and post activation twitch potentiation, which acts via the same pathway.
methodsA double-blind, placebo-controlled, randomized crossover study was conducted to determine the influence of dietary NO 3- on the contractile properties of the triceps brachii (60%-70% fast-twitch, or type II) and triceps surae (60%-70% slow-twitch, or type I) muscles of healthy young men ( n = 14). Participants were studied after acute ingestion of 2.2 mL/kg of beetroot juice either containing or lacking 200 µmol/kg of NO 3- , with neuromuscular electrical stimulation used to determine muscle function.
resultsNO 3- supplementation did not alter unpotentiated or potentiated peak twitch torque or the maximal rates of torque development or relaxation in either muscle group. On the other hand, NO 3- ingestion resulted in significant changes in the torque-frequency relationship of both the triceps brachii ( P = 0.019) and the triceps surae ( P < 0.001). This was due to a leftward shift of this sigmoidal relationship in the triceps brachii, but a rightward shift in the triceps surae.
conclusionsWe conclude that dietary NO 3- has opposing effects on the contractile properties of fast and slow human muscles, which could be due to differential changes in Ca 2+ sensitivity. However, potentiation was unaltered, suggesting that this occurs independently of changes in regulatory light chain phosphorylation. Additional research will be required to determine the underlying biochemical mechanisms.
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