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The Effect of Dietary Nitrate Supplementation on Isokinetic Torque in Adults: A Systematic Review and Meta-Analysis

1
Faculty of Health Sciences, Universidad Isabel I, 09003 Burgos, Spain
2
Studies Research Group in Neuromuscular Responses (GEPREN), University of Lavras, 37200-000 Lavras, Brazil
3
Faculty of Medicine, School of Medicine of Physical Education and Sport, Complutense University, 28040 Madrid, Spain
4
Faculty of Education Sciences, University of Alcalá, 19001 Guadalajara, Spain
5
Faculty of Sports Medicine, Natural Sciences Division, Pepperdine University, Malibu, CA 90263, USA
6
School of Sport, Exercise and Health Sciences, Loughborough University, Loughborough LE11 3TU, UK
*
Author to whom correspondence should be addressed.
Nutrients 2020, 12(10), 3022; https://doi.org/10.3390/nu12103022
Received: 26 August 2020 / Revised: 28 September 2020 / Accepted: 29 September 2020 / Published: 2 October 2020
(This article belongs to the Special Issue Nitrate Supplementation for Performance and Health)
Dietary nitrate (NO3) supplementation, which can enhance performance in exercise settings involving repeated high-intensity efforts, has been linked to improved skeletal muscle contractile function. Although muscular strength is an important component of explosive movements and sport-specific skills, few studies have quantified indices of muscular strength following NO3 supplementation, particularly isokinetic assessments at different angular velocities. We performed a systematic review and meta-analysis to determine whether dietary NO3 supplementation improves peak torque, as assessed by the gold standard method of isokinetic dynamometry, and if this effect was linked to the angular velocity imposed during the assessment. Dialnet, Directory of Open Access Journals, MEDLINE, PubMed, SciELO, Scopus, and SPORTDiscus were searched for articles using the following search strategy: (nitrate OR beet*) AND (supplement* OR nutr* OR diet*) AND (isokinetic OR strength OR “resistance exercise” OR “resistance training” OR “muscular power”). The meta-analysis of data from 5 studies with 60 participants revealed an overall effect size of −0.01 for the effect of nitrate supplementation on isokinetic peak torque, whereas trivial effect sizes ranging from −0.11 to 0.16 were observed for independent velocity-specific (90°/s, 180°/s, 270°/s, and 360°/s) isokinetic peak torque. Four of the five studies indicated that dietary NO3 supplementation is not likely to influence voluntary knee extensor isokinetic torque across a variety of angular velocities. These results suggest that NO3 supplementation does not influence isokinetic peak torque, but further work is required to elucidate the potential of NO3 supplementation to influence other indices of muscular strength, given the dearth of experimental evidence on this topic. View Full-Text
Keywords: beetroot; ergogenic aid; exercise performance; strength; muscle beetroot; ergogenic aid; exercise performance; strength; muscle
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MDPI and ACS Style

Lago-Rodríguez, Á.; Domínguez, R.; Ramos-Álvarez, J.J.; Tobal, F.M.; Jodra, P.; Tan, R.; Bailey, S.J. The Effect of Dietary Nitrate Supplementation on Isokinetic Torque in Adults: A Systematic Review and Meta-Analysis. Nutrients 2020, 12, 3022. https://doi.org/10.3390/nu12103022

AMA Style

Lago-Rodríguez Á, Domínguez R, Ramos-Álvarez JJ, Tobal FM, Jodra P, Tan R, Bailey SJ. The Effect of Dietary Nitrate Supplementation on Isokinetic Torque in Adults: A Systematic Review and Meta-Analysis. Nutrients. 2020; 12(10):3022. https://doi.org/10.3390/nu12103022

Chicago/Turabian Style

Lago-Rodríguez, Ángel, Raúl Domínguez, Juan J. Ramos-Álvarez, Francisco M. Tobal, Pablo Jodra, Rachel Tan, and Stephen J. Bailey 2020. "The Effect of Dietary Nitrate Supplementation on Isokinetic Torque in Adults: A Systematic Review and Meta-Analysis" Nutrients 12, no. 10: 3022. https://doi.org/10.3390/nu12103022

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