Table 3.
Predictors for Heart Rate Variability (HRV)
| Beta | t | P | R2Change | R2 | Adj.R2 | |
|---|---|---|---|---|---|---|
| Frequency domains | ||||||
| Total frequency (Hz) | ||||||
| Gender | −.234 | −2.849 | .005 | .116 | .116 | |
| Exercise beliefs | .238 | 2.903 | .004 | .076 | .192 | |
| DM type | −.206 | −2.528 | .013 | .035 | .227 | |
| HbA1c | −.199 | −2.470 | .015 | .038 | .265 | .24 |
| Low frequency (Hz) | ||||||
| PAR | .212 | 2.634 | .010 | .125 | .125 | |
| Exercise beliefs | .210 | 2.638 | .009 | .076 | .201 | |
| Gender | −.195 | −2.413 | .017 | .054 | .255 | |
| DM type | −.209 | −2.641 | .009 | .035 | .290 | |
| HbA1c | −.191 | −2.473 | .015 | .036 | .326 | .30 |
| High frequency (Hz) | ||||||
| Exercise beliefs | .256 | 2.977 | .004 | .091 | .091 | |
| DM type | −.243 | −2.822 | .006 | .057 | .148 | .133 |
| Time domain | ||||||
| SDNN | ||||||
| Gender | −.306 | −3.790 | .0001 | .169 | .169 | |
| PAR | .271 | 3.338 | .001 | .087 | .256 | |
| Exercise beliefs | .199 | 2.490 | .014 | .037 | .293 | .275 |
| SDANN | ||||||
| Gender | −.289 | −3.401 | .001 | .139 | .139 | |
| PAR | .212 | 2.485 | .014 | .054 | .193 | |
| Exercise beliefs | .166 | 1.982 | .050 | .026 | .219 | .199 |
| SD | ||||||
| PAR | .252 | 3.007 | .003 | .128 | .128 | |
| Gender | −.249 | −2.983 | .003 | .073 | .202 | |
| Exercise beliefs | .216 | 2.612 | .010 | .044 | .245 | .226 |
| pNN50 | ||||||
| PAR | .209 | 2.361 | .020 | .085 | .085 | |
| Exercise beliefs | .186 | 2.138 | .035 | .043 | .128 | |
| Gender | −.180 | −2.041 | .043 | .030 | .158 | .137 |
| rMSSD | ||||||
| Exercise beliefs | .233 | 2.664 | .009 | .078 | .078 | |
| PAR | .231 | 2.644 | .009 | .051 | .130 | .115 |
NOTE: Hz = Hertz; PAR = Seven-Day Physical Activity Recall (Sallis, Buono, Roby, Micale, & Nelson, 1993); Exercise Beliefs = Exercise Belief Instrument for Adolescents (Loman & Galgani, 1996); DM = diabetes mellitus; HbAlc = glycosylated hemoglobin; SDNN = standard deviation of all R-R intervals; SDANN = standard deviation of all the means of R-R intervals for each 5-minute block; SD = mean of the standard deviation of the R-R intervals of each 5-min block; pNN50 = % of adjacent R-R intervals with ≥50 ms difference; rMSSD = square root of the mean of the sum of squares of differences between adjacent R-R intervals.