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Table 2 Mean values and the average responses for all variables

From: Autonomic and muscular responses and recovery to one-hour laboratory mental stress in healthy subjects

  Baseline During the stressful task Response*
Variable Mean (SD) 0–10 min Mean (SD) 10–20 min Mean (SD) 20–30 min Mean (SD) 30–40 min Mean (SD) 40–50 min Mean (SD) 50–60 min Mean (SD) Mean (SD)
Surface electromyography         
   Trapezius (μV) 6.2 (6.2) 11.8 (13.7) 12.0 (12.8) 11.6 (13.8) 10.5 (11.3) 11.2 (12.4) 10.7 (11.8) 5.1 (11.4)
   Splenius (μV) 5.3 (3.2) 4.7 (2.7) 4.6 (2.3) 4.6 (2.6) 4.5 (3.0) 4.6 (3.5) 4.6 (3.1) -0.7 (3.1)
   Temporalis (μV) 6.5 (3.2) 6.4 (4.7) 7.0 (6.1) 6.6 (5.6) 7.1 (5.2) 7.3 (5.5) 7.2 (5.1) 0.5 (5.4)
   Frontalis (μV) 8.0 (5.9) 11.1 (5.8) 11.1 (6.1) 11.0 (6.6) 11.3 (6.4) 11.1 (6.5) 11.4 (6.5) 3.2 (4.8)
Systolic BP (mmHg) 112 (16) 126 (17) 122 (16) 122 (15) 123 (15) 123 (15) 125 (15) 11.4 (7.8)
Diastolic BP (mmHg) 62 (11) 72 (13) 69 (13) 69 (11) 71 (12) 70 (11) 71 (10) 8.6 (5.0)
Heart rate (beats/min) 71 (8) 75 (10) 74 (9) 73 (9) 72 (9) 72 (9) 72 (8) 2.3 (4.3)
Respiration (breaths/min) 15 (3) 17 (3) 17 (3) 16 (3) 16 (3) 16 (3) 16 (3) 1.5 (2.5)
Skin blood flow (au) 279 (112) 248 (122) 251 (130) 246 (127) 249 (126) 237 (127) 229 (120) -35.3 (56.7)
Pain (VAS 0–100 mm)   10 min 20 min 30 min 40 min 50 min 60 min  
   Maximal location (mm) 2.4 (6.1) 3.0 (5.3) 3.6 (5.8) 6.7 (11.1) 9.0 (14.4) 11.9 (15.5) 14.0 (17.1) 15.4 (18.0)
   Shoulder (mm) 2.8 (6.3) 2.4 (5.6) 4.5 (7.0) 5.4 (8.8) 6.5 (12.4) 8.7 (13.3) 10.3 (14.4) 12.9 (16.1)
   Neck (mm) 2.4 (5.1) 3.1 (5.6) 3.5 (6.4) 5.0 (9.1) 6.4 (8.2) 8.6 (12.2) 9.8 (11.9) 11.5 (13.7)
   Temples (mm) 1.0 (2.2) 2.3 (5.2) 1.9 (4.1) 3.7 (8.2) 4.2 (9.1) 5.6 (10.8) 5.5 (11.7) 7.5 (13.7)
   Forehead (mm) 1.1 (2.5) 1.6 (3.3) 2.5 (6.0) 3.8 (8.8) 4.2 (9.1) 4.7 (9.5) 5.3 (11.1) 6.3 (12.0)
Fatigue (VAS 0–100 mm) 8.9 (15.3) 7.7 (13.5) 10.8 (14.6) 19.0 (20.5) 22.2 (21.2) 29.8 (22.5) 33.1 (25.4) 27.2 (23.1)
Tension (VAS 0–100 mm) 7.0 (12.4) 11.2 (13.2) 12.9 (14.0) 18.0 (19.1) 19.4 (20.2) 21.7 (20.6) 25.3 (23.1) 21.2 (21.2)
   Recovery period Recovery §    
Variable   65–75 min 75–85 min 85–95 min     
Surface electromyography         
   Trapezius (μV)   5.4 (4.7) 5.6 (4.5) 6.2 (6.4) 0.14 (7.7)    
   Splenius (μV)   4.7 (2.7) 4.9 (3.0) 4.9 (3.4) -0.33 (3.6)    
   Temporalis (μV)   7.7 (4.9) 7.4 (5.3) 7.1 (4.2) 0.68 (3.8)    
   Frontalis (μV)   9.0 (6.9) 8.2 (5.5) 8.3 (5.1) 0.26 (3.9)    
Systolic BP (mmHg)   123 (15) 122 (14) 124 (14) 12.1 (11.7)    
Diastolic BP (mmHg)   71 (10) 69 (9) 71 (10) 9.5 (6.6)    
Heart rate (beats/min)   69 (7) 69 (8) 69 (8) -1.9 (3.8)    
Respiration (breaths/min)   14 (2) 14 (2) 14 (3) -0.68 (2.7)    
Skin blood flow (au)   215 (105) 229 (111) 211 (106) -67.5 (89.1)    
Pain (VAS 0–100 mm)   75 min 85 min 95 min     
   Maximal location (mm)   6.9 (15.2) 7.6 (14.9) 5.8 (13.5) 3.3 (11.4)    
   Shoulder (mm)   6.2 (15.0) 6.2 (14.9) 5.3 (13.7) 2.5 (11.4)    
   Neck (mm)   5.5 (11.0) 6.1 (12.5) 5.5 (11.5) 3.0 (10.1)    
   Temples (mm)   1.9 (5.9) 1.7 (4.5) 1.7 (5.2) 0.67 (4.7)    
   Forehead (mm)   2.2 (6.1) 1.8 (4.5) 1.8 (5.1) 0.63 (4.6)    
Fatigue (VAS 0–100 mm)   17.2 (20.2) 17.5 (21.8) 15.0 (20.2) 6.7 (19.3)    
Tension (VAS 0–100 mm)   8.2 (16.0) 8.1 (16.5) 4.8 (12.0) -1.4 (12.0)    
  1. au: arbitrary units. BP: blood pressure
  2. * Response = Average during stressful task (0–60 min) – baseline for the physiological variables, and maximal during stressful task (0–60 min) – baseline for the subjective variables.
  3. §Recovery = The last ten minutes of the recovery period (85–95 min) – baseline (summary statistics used in correlation analysis).