The Effect of Dietary Nitrate Supplementation on Isokinetic Torque in Adults: A Systematic Review and Meta-Analysis
Dietary nitrate (NO<sub>3</sub><sup>−</sup>) 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 o...
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doaj-32e0b601be3847e9975b460c934c9c062020-11-25T03:58:18ZengMDPI AGNutrients2072-66432020-10-01123022302210.3390/nu12103022The Effect of Dietary Nitrate Supplementation on Isokinetic Torque in Adults: A Systematic Review and Meta-AnalysisÁngel Lago-Rodríguez0Raúl Domínguez1Juan José Ramos-Álvarez2Francisco Miguel Tobal3Pablo Jodra4Rachel Tan5Stephen J. Bailey6Faculty of Health Sciences, Universidad Isabel I, 09003 Burgos, SpainStudies Research Group in Neuromuscular Responses (GEPREN), University of Lavras, 37200-000 Lavras, BrazilFaculty of Medicine, School of Medicine of Physical Education and Sport, Complutense University, 28040 Madrid, SpainFaculty of Medicine, School of Medicine of Physical Education and Sport, Complutense University, 28040 Madrid, SpainFaculty of Education Sciences, University of Alcalá, 19001 Guadalajara, SpainFaculty of Sports Medicine, Natural Sciences Division, Pepperdine University, Malibu, CA 90263, USASchool of Sport, Exercise and Health Sciences, Loughborough University, Loughborough LE11 3TU, UKDietary nitrate (NO<sub>3</sub><sup>−</sup>) 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 NO<sub>3</sub><sup>−</sup> supplementation, particularly isokinetic assessments at different angular velocities. We performed a systematic review and meta-analysis to determine whether dietary NO<sub>3</sub><sup>−</sup> 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 NO<sub>3</sub><sup>−</sup> supplementation is not likely to influence voluntary knee extensor isokinetic torque across a variety of angular velocities. These results suggest that NO<sub>3</sub><sup>−</sup> supplementation does not influence isokinetic peak torque, but further work is required to elucidate the potential of NO<sub>3</sub><sup>−</sup> supplementation to influence other indices of muscular strength, given the dearth of experimental evidence on this topic.https://www.mdpi.com/2072-6643/12/10/3022beetrootergogenic aidexercise performancestrengthmuscle |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Ángel Lago-Rodríguez Raúl Domínguez Juan José Ramos-Álvarez Francisco Miguel Tobal Pablo Jodra Rachel Tan Stephen J. Bailey |
spellingShingle |
Ángel Lago-Rodríguez Raúl Domínguez Juan José Ramos-Álvarez Francisco Miguel Tobal Pablo Jodra Rachel Tan Stephen J. Bailey The Effect of Dietary Nitrate Supplementation on Isokinetic Torque in Adults: A Systematic Review and Meta-Analysis Nutrients beetroot ergogenic aid exercise performance strength muscle |
author_facet |
Ángel Lago-Rodríguez Raúl Domínguez Juan José Ramos-Álvarez Francisco Miguel Tobal Pablo Jodra Rachel Tan Stephen J. Bailey |
author_sort |
Ángel Lago-Rodríguez |
title |
The Effect of Dietary Nitrate Supplementation on Isokinetic Torque in Adults: A Systematic Review and Meta-Analysis |
title_short |
The Effect of Dietary Nitrate Supplementation on Isokinetic Torque in Adults: A Systematic Review and Meta-Analysis |
title_full |
The Effect of Dietary Nitrate Supplementation on Isokinetic Torque in Adults: A Systematic Review and Meta-Analysis |
title_fullStr |
The Effect of Dietary Nitrate Supplementation on Isokinetic Torque in Adults: A Systematic Review and Meta-Analysis |
title_full_unstemmed |
The Effect of Dietary Nitrate Supplementation on Isokinetic Torque in Adults: A Systematic Review and Meta-Analysis |
title_sort |
effect of dietary nitrate supplementation on isokinetic torque in adults: a systematic review and meta-analysis |
publisher |
MDPI AG |
series |
Nutrients |
issn |
2072-6643 |
publishDate |
2020-10-01 |
description |
Dietary nitrate (NO<sub>3</sub><sup>−</sup>) 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 NO<sub>3</sub><sup>−</sup> supplementation, particularly isokinetic assessments at different angular velocities. We performed a systematic review and meta-analysis to determine whether dietary NO<sub>3</sub><sup>−</sup> 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 NO<sub>3</sub><sup>−</sup> supplementation is not likely to influence voluntary knee extensor isokinetic torque across a variety of angular velocities. These results suggest that NO<sub>3</sub><sup>−</sup> supplementation does not influence isokinetic peak torque, but further work is required to elucidate the potential of NO<sub>3</sub><sup>−</sup> supplementation to influence other indices of muscular strength, given the dearth of experimental evidence on this topic. |
topic |
beetroot ergogenic aid exercise performance strength muscle |
url |
https://www.mdpi.com/2072-6643/12/10/3022 |
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