Figure 3A-E. Values represent means (SE). a: NCON trial vs. ECON trial, P<0.05; **: NCON trial vs. ECON trial; ECAP trial vs. ECON trial, P<0.01; *: ECAP trial vs. NCON trial, P<0.05. RY, recovery; ANS, autonomic nervous system; HRV, heart rate variability; TOTAL, total power; HF, high frequency; LF, low frequency, PNS index, parasympathetic nervous system index; SNS index, sympathetic nervous system index.