Table 5. Correlations in parameters studied in the novel object test with regard to the age of horse

Behavior Heart rate Heart rate variability
Behavioral score Escape duration (s) BHR (bpm) MHR (bpm) Time to MHR (s) SDNN (ms) RMSSD (ms) LF/HF
Age 0.165 0.118 0.225 0.187 0.267 −0.488* −0.416* 0.073
p < 0.05.
BHR, basal heart rate; bpm, beats per minute; MHR, maximum heart rate; SDNN, standard deviation of the beat-to-beat intervals; ms, milli seconds; RMSSD, root mean square of successive differences; LF/HF, the ratio of low frequency to high frequency components of continuous series of beats (power spectrum).