Skip to main content

Table 1 Characteristics of randomized, double-blind, placebo-controlled, crossover studies included in meta-analysis

From: Effect of dietary nitrate on human muscle power: a systematic review and individual participant data meta-analysis

Authors and year Subjects NO3 dose
N Age (y) Source Amount (mmol)
Measured Assumed Duration Placebo Test modality
Rothwell and Alkhatib 2014 [42] 12 21 BRJ   6.4 Acute dose Othera Sprint cycling
Coggan et al. 2015 [43] 12 36 BRJ 11.2   Acute dose NO3-free BRJ Isokinetic knee extension
Coggan et al. 2015 [44] 9 57 BRJ 11.2   Acute dose NO3-free BRJ Isokinetic knee extension
Rimer et al. 2016 [45] 13 26 BRJ 11.2   Acute dose NO3-free BRJ Sprint cycling
Porcelli et al. 2016 [46] 7 25 High NO3 diet   8.2 6 days Normal NO3 diet Sprint cycling
Kramer et al. 2016 [47] 12 23 KNO3   8.0 6 days KCl Sprint cycling
Wylie et al. 2016 [48] 10 21 BRJ 8.2   5 days NO3-free BRJ Sprint cycling
Domínguez et al. 2017 [49] 15 21 BRJ   6.4 Acute dose Otherb Sprint cycling
Coggan et al. 2018 [50] 8 65 BRJ 11.2   Acute dose NO3-free BRJ Isokinetic knee extension
Bender et al. 2018 [51] 12 17 BRJ   12.9 Acute dose NO3-free BRJ Sprint cycling
Jonvik et al. 2018 [52] 52 24 BRJ   12.9 6 days NO3-free BRJ Sprint cycling
Cuenca et al. 2018 [53] 15 22 BRJ   6.4 Acute dose NO3-free BRJ Sprint cycling
Smith et al. 2019 [54] 12 22 BRJ   6.4 Acute dose NO3-free BRJ Sprint cycling
Jodra et al. 2020 [55] 15 23 BRJ   6.4 Acute dose NO3-free BRJ Sprint cycling
Coggan et al. 2020 [56] 12 71 BRJ 13.4   Acute dose NO3-free BRJ Isokinetic knee extension
Jonvik et al. 2020 [57] 15 25 BRJ 15.9   6 days NO3-free BRJ Isokinetic knee extension
Rodriguez-Fernandez et al. 2020 [58] 18 23 BRJ   12.9 Acute dose Otherb Inertial load squats
Gallardo et al. 2021 [59] 9 70 BRJ 13.7   Acute dose NO3-free BRJ Isokinetic knee extension
Dumar et al. 2021 [60] 10 20 BRJ   6.4 Acute dose Otherc Sprint cycling
  1. BRJ beetroot juice. aWater colored and flavored with blackcurrant juice. bWater colored and flavored with BRJ powder (1 g/L) and lemon juice. cUndiluted blackcurrant juice