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Table 1 Potentiated low- and high-frequency doublets of leg muscles’ values in the runners and control participants before (Pre) and after (Post) the mountain ultra-marathon

From: The increase in hydric volume is associated to contractile impairment in the calf after the world’s most extreme mountain ultra-marathon

  Runners (n = 11) Control subjects (n = 8)
Pre Post Pre Post
Knee extensor (KE)
 Potentiated low-frequency doublets-PS10 (N) 143 ± 11 119 ± 15** 140 ± 8 172 ± 10
 Potentiated high-frequency doublets-PS100 (N) 141 ± 8 119 ± 11** 157 ± 7 159 ± 11
 PS10/PS100 1.01 ± 0.03 0.98 ± 0.07 0.90 ± 0.07 1.08 ± 0.02
Plantar flexor (PF)
 Potentiated low-frequency doublets-PS10 (Nm) 47 ± 4 36 ± 3** 44 ± 5 38 ± 6**
 Potentiated high-frequency doublets-PS100 (Nm) 46 ± 4 36 ± 2* 44 ± 9 38 ± 7**
 PS10/PS100 1.03 ± 0.04 0.99 ± 0.02 1.01 ± 0.04 1.00 ± 0.05
  1. Values are expressed as the mean ± SEM
  2. PS10/PS100 low- to high-frequency doublet peak force ratio
  3. p < 0.05, ** p < 0.01 for differences between Post- and Pre-values
  4. p < 0.05 for differences between runners and control subjects
  5. Differences between Post- and Pre-values
  6. KE PS10 in control: p = 0.0580
  7. KE PS100 in control: p = 0.7781
  8. PF PS10 in control: p = 0.0085
  9. PF PS100 in control: p = 0.0064
  10. KE PS10 in runners: p = 0.0029
  11. KE PS100 in runners: p = 0.0058
  12. PF PS10 in runners: p = 0.0030
  13. PF PS100 in runners: p = 0.0202
  14. Interactions group/time
  15. PF PS10: p = 0.1433/PF PS100: p = 0.4666
  16. KE PS10: p = 0.0004/KE PS100: p = 0.0406