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Heart rate variability changes during repeated massage sessions. lnHF: natural logarithm of the high frequency power; lnLF: natural logarithm of the low frequency power. Mean lnHF (with SE) at baseline and during six massage sessions: 0.63 (1.18), 1.51 (1.23), 2.21 (1.2), 1.7 (1.13), 1.67 (1.23), 1.59 (1.28), and 1.59 (1.22). Mean lnLF (with SE) at baseline and during six massage sessions: 1.24 (1.24), 1.84 (1.26), 2.39 (1.26), 2.1 (1.17), 2.33 (1.23), 2.32 (1.09), and 2.16 (1.19).
