Table 2.
Study research.
| Database | Query | Research in | Items found | |
|---|---|---|---|---|
| PubMed | #1 | Prana OR Pranayama OR Pranayamic OR Pranayams OR “Breathing technique” OR “Breath technique” OR “Breathing exercise” OR “Breath exercise” OR “Paced breathing” OR “Paced breath” OR “Controlled breathing” OR “Controlled breath” OR “Slow breathing” OR “Slow breath” OR “Deep breathing” OR “Deep breath” OR “Metronome breathing” OR “Metronome breath” OR Yoga OR “Heart Rate Variability Biofeedback” OR “HRV Biofeedback” | Title/abstract | 7,254 |
| #2 | “Cardiorespiratory coherence” OR “Cardio respiratory coherence” OR “Cardio-respiratory coherence” OR “Cardiorespiratory coupling” OR “Cardio respiratory coupling” OR “Cardio-respiratory coupling” OR “Cardiorespiratory interaction” OR ”Cardio respiratory interaction“ OR ”Cardio-respiratory interaction“ OR ”Cardiorespiratory synchronization“ OR ”Cardio respiratory synchronization“ OR ”Cardio-respiratory synchronization“ OR Electroencephalogram OR EEG OR ”Functional connectivity“ OR ”Heart rate variability“ OR HRV OR ”Magnetic resonance imaging“ OR MRI OR ”Respiratory Sinus Arrhythmia“ OR RSA | Title/abstract | 419,224 | |
| #3 | Combine #1 AND #2 | 997 | ||
| #4 | Limit to ”Humans“ | 835 | ||
| #5 | Limit to (English) | 788 | ||
| Scopus | #1 | Prana OR Pranayama OR Pranayamic OR Pranayams OR ”Breathing technique“ OR ”Breath technique“ OR ”Breathing exercise“ OR ”Breath exercise“ OR ”Paced breathing“ OR ”Paced breath“ OR ”Controlled breathing“ OR ”Controlled breath“ OR ”Slow breathing“ OR ”Slow breath“ OR ”Deep breathing“ OR ”Deep breath“ OR ”Metronome breathing“ OR ”Metronome breath“ OR Yoga OR “Heart Rate Variability Biofeedback” OR “HRV Biofeedback” | Title/abstract/keywords | 19,999 |
| #2 | ”Cardiorespiratory coherence“ OR ”Cardio respiratory coherence“ OR ”Cardio-respiratory coherence“ OR ”Cardiorespiratory coupling“ OR ”Cardio respiratory coupling“ OR ”Cardio-respiratory coupling“ OR ”Cardiorespiratory interaction” OR “Cardio respiratory interaction” OR “Cardio-respiratory interaction” OR “Cardiorespiratory synchronization” OR “Cardio respiratory synchronization” OR “Cardio-respiratory synchronization” OR Electroencephalogram OR EEG OR “Functional connectivity” OR “Heart rate variability” OR HRV OR “Magnetic resonance imaging” OR MRI OR “Respiratory Sinus Arrhythmia” OR RSA | Title/abstract/keywords | 944,852 | |
| #3 | Combine #1 AND #2 | 1,897 | ||
| #4 | Limit to (Humans OR Human) | 1,772 | ||
| #5 | Limit to (English) | 1,673 |