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Table 3 Static strength of the arm flexor and knee extensor muscles, and distance walked during a 6-min walk test (6MWT) in patients with fibromyalgia (FMS) and healthy controls (CON) before and after 15 weeks of resistance exercise twice per week, as well as the P value for within-group comparison (Wilcoxon test)

From: Effects of 15 weeks of resistance exercise on pro-inflammatory cytokine levels in the vastus lateralis muscle of patients with fibromyalgia

   FMS P value CON P value
   Before After   Before After  
Elbow flexion force (kg)       
  Right 11.9 (6.5)# 14.3 (6.7)* <0.001 18.4 (6.2) 16.9 (6.3) 0.845
  Left 11.6 (7.3)# 14.2 (7.4)* 0.007 16.4 (5.9) 17.3 (4.3) 0.845
Knee extension force (N)       
  Right 322 (117) 340 (122) 0.153 380 (134) 406 (101) 0.248
  Left 310 (108) 328 (138) 0.066 348 (125) 365 (106) 0.248
  Most painful 307 (133)* 338 (110)* 0.307 380 (134) 405 (87) 0.248
6MWT (m) 561 (66) 570 (100)# 0.153 633 (100) 665 (62) 0.054
  1. Data are presented as median (interquartile range)
  2. Bold italic figures denote significant differences
  3. Between group comparisons: # P < 0.001, P < 0.01 and *P < 0.05 (Mann-Whitney U test)