19 May 2026 : Clinical Research
Association of Novel Oral Appliance Use With Heart Rate Variability in Adolescent Athletes
Jui-Kun Chiang
ACDG 1, Yen-Chang Lin ABD 2, Hsueh-Hsin Kao D 3, Tzu-Ying Hung E 2, Weir-Chiang You DE 3,4*, Yee-Hsin Kao DEF 5
DOI: 10.12659/MSM.952561
Med Sci Monit 2026; 32:e952561
Table 2 Correlations among variables presented as r values with corresponding P values.
| Variable | ||
|---|---|---|
| Time domain | ||
| RMSSD (milliseconds) | SDSD (milliseconds) | |
| p.NN50 (%) | 0.878 (<0.001) | 0.878 (<0.001) |
| SDSD (milliseconds) | 1.000 (<0.001) | – |
| Frequency domain | ||
| LF/HF ratio | LF power | |
| LF power | 0.339 (<0.001) | – |
| HF power | −0.234 (0.002) | 0.502 (<0.001) |
| RMSSD – square root of the mean of the squares of differences between adjacent RR intervals; p.NN50 – proportion of adjacent RR intervals differing by more than 50 milliseconds; SDSD – standard deviation of differences between adjacent RR intervals; HF – absolute power of the high-frequency band; LF – absolute power of the low-frequency band. | ||