Table 1
Clinical characteristics and values of time and frequency domains for the total study group and 95% confidence interval expressed as mean ± SD for normally distributed data and median (IQR) for non-normally distributed data
| HRV | Total (n = 79) | 95% CI |
|---|---|---|
| Age | 7 ± 3.7 | 6–7.73 |
| BW (kg) | 8.42 ± 4.45 | 7.4–9.4 |
| Sex (M/F) | 39/40 | - |
| Mean RR | 477 (404–576) | 471–519 |
| Mean HR | 124 (103–146) | 120–132 |
| SDNN | 61.9 (38.5–87.8) | 60–77.1 |
| rMSSD | 56.6 (33.2–121) | 69.9–102.5 |
| pNN50 | 27.6 (9.44–60.38) | 29.2–41.7 |
| TP (ms2) | 1,898 (947–3,641) | 2,037–3,851 |
| VLF (ms2) | 164 (70.2–517.7) | 274–618 |
| LF (ms2) | 652 (457–1,116) | 714–1,113 |
| HF (ms2) | 635 (284–1,952) | 932–2,385 |
| LF/HF | 0.99 (0.48–1.95) | 1.07–1.68 |
[i] BW – body weight; mean RR – mean value of the R–R intervals; mean HR – mean value of the heart rate; SDNN – standard deviation of all R–R intervals in 5-min recording; rMSSD – root-mean-square of successive R–R interval difference; pNN50 (%) – the percentage of successive R– R intervals >50 ms; TP – total power; VLF – very-low-frequency component; HF – high-frequency component; LF – low-frequency component; LF/HF – high to low frequency ratio
Table 2
Clinical characteristics and values of time and frequency domains in dogs grouped by age as under and over six years of age, expressed as mean ± SD for normally distributed data and median (IQR) for non-normally distributed data
| HRV | Dogs ≤ 6 years (n = 41) | Dogs > 6 years (n = 37) |
|---|---|---|
| Age (years) | 4 ± 1.55 | 10.1 ± 2.64 |
| BW (kg) | 8.06 ± 4.9 | 8.82 ± 3.87 |
| Sex (M/F) | 22/19 | 17/21 |
| Mean RR | 475 (394–568) | 488 (416–602) |
| Mean HR | 130 (108–154) | 122 (101–142) |
| SDNN | 60.3 (38.4–84.9) | 65.9 (37.7–87.8) |
| rMSSD | 54.2 (32.2–120) | 67 (31.6–124.1) |
| pNN50 | 26.7 (8.9–62.6) | 29.6 (9.3–61.2) |
| TP (ms2) | 1,885 (971–3,752) | 2,029 (917–3,350) |
| VLF (ms2) | 186 (94.5–627) | 155 (52.5–284.5) |
| LF (ms2) | 653 (523–1,111) | 586 (420–1,137) |
| HF (ms2) | 513 (256–1,858) | 865 (338.5–2,034.5) |
| LF/HF | 1.1 (0.62–2) | 0.96 (0.4–1.7) |
[i] Legend as in Table 1
Table 3
Clinical characteristics and values of time and frequency domains for different groups distributed by sex, expressed as mean ± SD for normally distributed data and median (IQR) for non-normally distributed data
| HRV | Males (n = 39) | Females (n = 40) |
|---|---|---|
| Age (years) | 7.06 ± 3.9 | 6.89 ± 4.1 |
| BW (kg) | 8.9 ± 4.8 | 7.9 ± 3.6 |
| Mean RR | 513 (413–599) | 449 (389–527) |
| Mean HR | 117 (103–139) | 132 (108–151) |
| SDNN | 65.9 (38.1–103.5) | 58 (38.7–82.1) |
| RMSSD | 73 (29.9–142.8) | 52.6 (34.4–116.1) |
| pNN50 | 36.2 (8–69.5) | 25.2 (10.5–55.8) |
| TP (ms2) | 2,430 (966–4,441) | 1,647 (940–2,483) |
| VLF (ms2) | 164 (73–526) | 165 (62–437) |
| LF (ms2) | 657 (486–1,108) | 609 (420–1,142) |
| HF (ms2) | 865 (271–2,980) | 575 (306–1,235) |
| LF/HF | 0.96 (0.3–1.7) | 1.1 (0.6–2) |
[i] Legend as in Table 1