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. 2015 Mar 2;12(3):2687–2699. doi: 10.3390/ijerph120302687

Figure 2.

Figure 2

ln(HF) value of heart rate variability during the forest and urban walk. (A) Changes in each 1-min average ln(HF) value over the 17-min walk. (B) Overall mean ln(HF) values. N = 19, mean ± standard error. * p < 0.05, paired t-test.