Table 2.
Linear regression analyses of combined n-3 fatty acids and physical activity as predictors of indices of heart rate variability
| Model | Heart rate | SDNN | RMSSD | High frequency | Low frequency | Low-to-high frequency ratio | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
| |||||||||||||
| β | p | β | p | β | p | β | p | β | p | β | p | ||
| 1 | EPA+DHA | .206 | .001 | .133 | .03 | .138 | .02 | .032 | .52 | .056 | .53 | −.008 | .89 |
| 2 | Physical activity | .216 | <.001 | .095 | .12 | .133 | .03 | .015 | .78 | −.084 | .14 | −.096 | .10 |
| 3 | EPA+DHA | .178 | .003 | .122 | .04 | .122 | .04 | .031 | .55 | .049 | .39 | .007 | .91 |
| Physical activity | .189 | .002 | .077 | .21 | .114 | .06 | .010 | .85 | −.091 | .11 | −.097 | .11 | |
| 4 | EPA+DHA | .175 | .004 | .117 | .05 | .117 | .05 | .027 | .60 | .048 | .40 | .010 | .87 |
| Physical activity | .189 | .002 | .076 | .21 | .114 | .05 | .010 | .85 | −.091 | .11 | −.097 | .11 | |
| Interaction | .087 | .14 | .147 | .01 | .137 | .02 | .125 | .01 | .033 | .56 | −.087 | .13 | |
Covariates were age, race, and sex in all models.
SDNN = standard deviation of inter-beat intervals. RMSSD = root mean square of differences in successive interbeat intervals DHA = docosahexanenoic acid. EPA = eicosapentaenoic acid.