Figure 4From: Interaction with indoor plants may reduce psychological and physiological stress by suppressing autonomic nervous system activity in young adults: a randomized crossover studyComparison of average log[LF/(LF + HF)] and logHF of HRV during the last 3 min of plant and computer tasks. N = 24, mean ± SE, *P < 0.05 (paired t test). HF: high-frequency component, LF: low-frequency component.Back to article page