| HRV | heart rate variability |
| VO2 | Oxygen consumption |
| RMSSD | Root Mean Square of Successive Differences |
| HF | High Frequency (power of heart rate variability) |
| SDNN | Standard Deviation of Normal-to-Normal Intervals |
| NOS | nitric oxide synthases |
| NO | nitric oxide |
| PRISMA | Preferred Reporting Items for Systematic Reviews and Meta-Analyses |
| MD | Mean difference |
| BMI | Body Mass Index |
| OFD | orange-flavored control |
| IL-6 | Interleukin-6 |
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