Table 7.
Spearman correlation analysis between HRR and HRV parameters in SCAD
| SDNN | SDANN | RMSSD | pNN50 | VLF | LF | HF | LF/HF | |
|---|---|---|---|---|---|---|---|---|
| HRR1 | 0.193 | 0.168 | 0.154 | 0.130 | 0.237 | 0.203 | 0.192 | 0.045 |
| HRR1 ≤24 bpm | −0.239 | −0.223 | −0.276* | −0.252* | −0.246 | −0.194 | −0.229 | 0.044 |
| HRR2 | 0.226 | 0.177 | 0.259* | 0.245 | 0.236 | 0.161 | 0.235 | −0.044 |
| HRR2 ≤42 bpm | −0.119 | −0.090 | −0.171 | −0.158 | −0.109 | −0.060 | −0.170 | 0.107 |
| HRR3 | 0.271* | 0.245 | 0.231 | 0.223 | 0.186 | 0.145 | 0.247 | −0.082 |
| HRR4 | 0.159 | 0.129 | 0.220 | 0.218 | 0.161 | 0.095 | 0.183 | −0.086 |
| HRR5 | 0.228 | 0.202 | 0.271* | 0.251* | 0.153 | 0.102 | 0.238 | −0.165 |
Abbreviations: HRR, heart rate recovery; HRV, heart rate variability; SCAD, stable coronary artery disease; SDNN, standard deviation of NN intervals; SDANN, standard deviation of all 5-minute mean NN intervals; RMSSD, root mean square of successive differences; pNN50, the proportion derived by dividing the number of interval differences of successive NN intervals greater than 50 ms by the total number of NN intervals; VLF, very-low-frequency power; LF, low-frequency power; HF, high-frequency power; HRRn, heart rate recovery at n minutes post-exercise. Statistical significance is shown as *P < 0.05.