Influence of Obesity on Heart Rate Variability in Nurses with Age and Shift Type as Moderators

Figure 1

Research hypotheses and framework. Abbreviations: HRV: heart rate variability; HF: high frequency; LF: low frequency; LF/HF: low- to high-frequency power ratio; VLF: very low frequency; TP: total power; SDNN: standard deviation of normal-to-normal interval.