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Table 4 Regression of pressure pain threshold of trapezius in TM using the intramuscular variables (R 2= 0.39)

From: Algogenic substances and metabolic status in work-related Trapezius Myalgia: a multivariate explorative study

Variable Time point VIP Sign of coeff
Blood flow 150 min 1.14 -
  170 min 1.07 -
  190 min 1.05 -
  210 min 1.40 -
  335 min 1.18 -
  345 min 1.56 -
HHB 21-40 min 1.09 -
  recov1 1.47 -
  recov2 1.36 -
  STR 1.03 +
OHB recov1 1.27 -
  recov2 1.35 -
THB 21-40 min 1.01 -
  PEG-0-20 min 1.17 -
  recov1 1.55 -
  recov2 1.63 -
[Lactate] 170 min 1.27 -
  210 min 1.06 -
  335 min 1.11 -
[Pyruvate] 170 min 2.13 -
  190 min 1.07 -
  210 min 1.14 -
[Glucose] 170 min 1.67 -
  335 min 1.49 -
  345 min 1.29 -
[Glutamate] 345 min 1.09 -
[BKN] 150 min 2.52 -
  170 min 1.13 -
  310 min 1.42 +
  325 min 1.53 +
  335 min 1.73 +
  355 min 1.22 +
[IL-6] 150 min 2.57 -
  170 min 1.50 -
  190 min 1.55 -
  210 min 1.66 -
  345 min 1.10 -
  355 min 1.22 -
[K + ] 170 min 1.77 +
  190 min 1.19 +
  210 min 1.00 +
  335 min 1.04 +
  1. [substance] denotes concentration of the substance. HHB = deoxy-haemoglobin, OHB = oxyhaemoglobin, THb = total haemoglobin, BKN = Bradykinin, IL-6 = interleukin 6, K+ = potassium, PEG = repetitive low-force exercise performed unilaterally on a pegboard, STR = STROOP test.
  2. VIP values and sign of coefficient (coeff) are given. Note that the variables are grouped and sorted within each variable with respect to time point. A positive coefficient indicates that this variable will be associated with high PPT values and vice versa. Note the inverse construction of blood flow variables.