Figure 4From: Physiological and psychological responses of young males during spring-time walks in urban parksThe one-minute averages and the overall mean ln(LF/HF) value of heart rate variability (HRV) during the urban park walk and the city area walk. (A) Change in each one-minute ln(LF/HF) value. (B) Overall mean ln(LF/HF) values. N = 12, mean ± standard error. **P < 0.01, determined by the paired t-test.Back to article page