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Table 2 Changes of Δsympathetic, Δparasympathetic, ΔHR, ΔSBP, ΔDBP and ΔEEG alpha-band ratio

From: Physiological responses at short distances from a parametric speaker

  speaker condition distance condition time condition
  general parametric 0.3m 1.0m task period recovery period
Δ Sympathetic nerve activity 1.152 ± 0.161 1.326 ± 0.174 1.004 ± 0.150 1.047 ± 0.182 1.162 ± 0.306 * 1.796 ± 0.351
ΔParasympathetic nerve activity -0.079 ± 0.011 -0.102 ± 0.013 -0.090 ± 0.013 -0.091 ± 0.012 -0.089 ± 0.024 + -0.113 ± 0.022
ΔHeart rate -1.047 ± 0.318 -0.770 ± 0.284 -0.454 ± 0.276 -1.363 ± 0.321 -0.719 ± 0.492 ** 2.170 ± 0.726 *
ΔSBP 0.389 ± 0.700 -0.602 ± 0.631 1.028 ± 0.673 -1.241 ± 0.645 -0.702 ± 1.226 + 0.500 ± 1.096
ΔDBP 6.176 ± 0.774 6.343 ± 0.971 5.148 ± 0.884 7.370 ± 0.859 6.597 ± 1.397 *** 10.500 ± 0.719 **
Δα brand ratio at Fz    -0.008 ± 0.003 -0.002 ± 0.003 -0.003 ± 0.003 -0.007 ± 0.003 0.001 ± 0.006 0.014 ± 0.007
Δα brand ratio at Cz    -0.003 ± 0.003 0.006 ± 0.003 -0.002 ± 0.003 0.003 ± 0.003 0.010 ± 0.006 0.008 ± 0.005
Δα brand ratio O1    0.007 ± 0.002 0.015 ± 0.004 0.009 ± 0.003 0.014 ± 0.003 0.018 ± 0.007 0.007 ± 0.004
  1. +: P <0.1, *: P <0.05, **: P <0.01, ***: P <0.001.