Table 3. Mean (┬▒standard deviation) of HRV and IPS according to competitive-anxiety group (Low and High).
Variable Low (n = 31) High (n = 35) F p ES
SDNN (ms)* 66.1 (22.3) 57.9 (25.2) 36.3 .01 .6
pNN50 (%)* 24.2 (5.5) 20.1 (4.0) 45.6 .01 .9
InRMSSD (ms)* 3.9 (.3) 3.3 (.4) 52.7 .01 1.0
LFnu* 45.8 (9.7) 55.0 (20.3) 52.8 .01 1.0
HFnu* 56.4 (21.2) 47.1 (20.4) 40.6 .01 .6
LF/HF* .9 (.1) 1.0 (.1) 53.0 .01 .9
IPS (points) 775.1 (76.0) 769.5 (71.4) 5.6 .28 .1
*p < 0,05 between Low and High Groups.
Note. SDNN = standard deviation of all N-N intervals; pNN50 = successive percentage of differences in R-R intervals greater than 50 ms; InRMSSD = logarithm of the difference of the quadratic mean of the successive normal R-R intervals; LFnu = corrected low frequency spectral component; HFnu = corrected high frequency spectral component; LF/HF = ratio between LF and HF; IPS = International Point Score; ES = effect size