Table 4.
Heart Rate Variability
| Variable | Baseline | Control | Pistachio | Mean Difference Pistachio—Control | P Value* |
|---|---|---|---|---|---|
| RMSSD, mm | 24.9±1.1 | 23.9±1.1 | 27.2±1.3 | 3.3±1.2 | 0.028 |
| High frequency, ms2 | 273.5±24.4 | 253.3±25.1 | 315.1±28.8 | 61.8±27.0 | 0.007 |
| Low frequency, ms2 | 494.9±43.1 | 480.0±43.8 | 575.0±58.4 | 95.0±51.1 | 0.041 |
| Low:high frequency, ms2 | 2.7±0.2 | 2.9±0.2 | 2.5±0.2 | −0.4±0.2 | 0.59 |
| Total power, ms2 | 1256.0±87.3 | 1236.3±116.8 | 1401.0±115.4 | 164.7±116.1 | 0.10 |
Data are mean±standard error from the rest, stress tasks, and recovery periods, n=30. BMI indicates body mass index; RMSSD, square root of the mean squared differences of successive R‐R intervals.
*
Statistical significance for comparison between Control and Pistachio diets by PROC MIXED in SAS, after adjustment for age, sex, BMI, and baseline (run‐in) values.