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Histogram of heart rate variability (RR, RMSSD, LF, lnHF, LF/HF) for seven postures. NP stands for neutral, PE stands for posterior extension, FF stands for forward flexion, LLF stands for left lateral flexion, RLF stands for right lateral flexion, LR stands for left rotation, RR stands for right rotation. *p < 0.05, ***p < 0.01.
