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Table 1 Changes in mechanical detection (mN) and pressure pain threshold (N/cm2)

From: 20-kHz alternating current stimulation: effects on motor and somatosensory thresholds

 Intervention0 min15 min20 min30 minSignificance intragroup (a)
Mechanical Detection Threshold20 kHz0.25 (0.25–0.25)0.25 (0.25–2.00)0.25 (0.25–0.25)0.25 (0.25–0.25)χ2: 12,75; p < 0.01
SHAM0.25 (0.25–0.25)0.25 (0.25–0.25)0.25 (0.25–0.25)0.25 (0.25–0.25)χ2: 0,00; p = 1.00
 Significance intergroup (b)p = 1.00p = 0.02p = 0.36p = 1.00 
Pressure Pain Threshold (c)20 kHz70.0 (4.3)69.8 (4.2)70.5 (4.9)68.9 (4.8)“Time” factor:
F: 0.54; p = 0.66
“Intervention” factor: F: 0.26; p = 0.62
SHAM69.0 (4.6)70.0 (5.2)67.3 (4.9)68.5 (5.2)
  1. Data of Mechanical Detection Threshold are expressed as median values (25–75% inter-quartile range), and data of Pressure Pain Threshold as mean value (standard error). (a)Friedman test. (b) Mann-Whitney test. (c) Two-way ANOVA repeated measures