Skip to main content

Table 2 Comparison of resting heart rate variability parameters under energy drink and placebo conditions

From: Cardiovascular and ride time-to-exhaustion effects of an energy drink

Parameter Energy drink Placebo p-value
RMSSD (ms) 76.1 (46.0) 83.7 (54.5) 0.33
SDNN (ms) 94.1 (34.3) 102.0 (51.9) 0.28
pNN50 (%) 38.8 (24.7) 38.8 (21.2) 1.00
LF (ms2) 1319 (756) 2295 (2593) 0.12
HF (ms2) 4047 (4569) 4235 (5317) 0.79
LF/HF ratio 0.93 (1.15) 0.91 (0.93) 0.90
SampEn 1.33 (0.37) 1.44 (0.37) 0.22
  1. Data are presented as mean (standard deviation). RMSSD - root-mean square differences of successive R-R intervals, SDNN- standard deviation of normal-to-normal intervals, pNN50 percentage of successive NN intervals differing >50 ms, LF - low frequency, HF - high frequency, LF/HF ratio low frequency to high frequency ratio (no units), SampEn - Sample Entropy (no units).