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Table 3 Comparison between beetroot juice (BJ) supplementation and placebo (PL) experimental condition on cardiorespiratory variables

From: Effects of a single dose of beetroot juice on cycling time trial performance at ventilatory thresholds intensity in male triathletes

  EC VT1 VT2 Total (VT1 + VT2) P 1 P 2
HR(beats·sec−1) BJ 130.7 (17.3) 159.6 (11.7) 145.1 (13.8) 0.517 0.485
PL 129.4 (17.2) 160.0 (14.0) 144.3 (14.0)   
VO2 (L·min−1) BJ 2.4 (0.4) 3.4 (0.3) 2.9 (0.3) 0.241 0.493
PL 2.4 (0.5) 3.3 (0.4) 2.9 (0.4)   
VO2 (%) BJ 61.8 (11.3) 85.9 (7.6) 73.8 (8.9) 0.253 0.512
PL 60.5 (12.2) 83.9 (8.3) 72.2 (9.4)   
VCO2 (L·min−1) BJ 2.5 (0.4) 3.7 (0.4) 3.1 (0.3) 0.001 0.579
PL 2.4 (0.5) 3.5 (0.5) 2.9 (0.4)   
RER BJ 0.9 (0.0) 1.1 (0.1) 1.0 (0.0) 0.106 0.623
PL 0.9 (0.1) 1.1 (0.1) 1.0 (0.0)   
VE (L·min−1) BJ 74.9 (14.6) 127.6 (19.9) 101.2 (15.9) 0.054 0.622
PL 72.9 (16.8) 125.5 (23.5) 96.8 (16.8)   
VE·VO2−1 BJ 28.9 (2.1) 36.3 (4.5) 32.6 (2.9) 0.483 0.587
PL 28.4 (1.9) 36.5 (5.7) 31.6 (2.5)   
VE·VCO2−1 BJ 28.9 (1.6) 33.4 (3.1) 31.1 (2.1) 0.162 0.573
PL 29.3 (1.6) 34.2 (4.4) 31.1 (1.9)   
  1. Data are provided as mean ± standard deviation (SD) and percentage (%)
  2. Abbreviations: EC experimental condition, HR heart rate, RER respiratory exchange ratio, VCO2 carbon dioxide, VE minute ventilation, VE·VCO2−1 ventilatory equivalent for carbon dioxide, VE·VO2− 1 ventilatory equivalent for oxygen, VO2 oxygen uptake, VO2max maximal oxygen uptake, VT1 first ventilatory threshold, VT2 second ventilatory threshold
  3. 1Significant differences for supplementation effect
  4. 2Significant differences for supplementation x intensity interaction