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Table 2 Descriptive measures during fatigue development for evoked twitches and the ability to maintain the required force level during the contractions (SLP). Values are mean(standard deviation) for both genders and muscle groups.

From: Sex differences in the rate of fatigue development and recovery

   Elbow Flexors Knee Extensors
Variable Contraction Female Male Female Male
Twitch (N) Pre* 25.3(9.8) 70.4(22.0) 207.3(32.9) 310.0(73.4)
  1* 22.9(10.7) 59.2(17.2) 180.0(29.9) 252.5(31.5)
  2* 21.9(11.0) 50.3(15.7) 172.2(28.2) 223.5(35.7)
  3* 23.4(8.5) 48.1(16.7) 150.6(50.8) 207.6(43.7)
  4 22.5(10.9) 41.2(11.3) 166.0(25.6) 185.7(39.9)
  5 21.8(7.7) 40.7(12.3) 157.7(32.4) 170.1(42.2)
  6 23.0(9.4) 35.7(14.1) 148.8(24.3) 150.5(39.9)
  7 20.6(12.0) 31.3(13.0) 146.0(28.0) 143.2(41.1)
  8 18.3(6.0) 31.2(13.1) 122.2(49.9) 130.2(44.8)
  9 18.2(10.2) 28.5(14.2) 128.8(29.7) 118.9(32.2)
  10 17.5(9.8) 25.4(14.8) 121.8(30.6) 112.0(35.9)
SLP (N·sec-1) 1 0.78(4.5)† -0.04(0.9) 0.11(0.6) 0.36(1.0)
  2 -0.15(0.5) -0.06(0.5) -0.66(0.5) 0.39(2.4)
  3 -0.22(0.3) 0.01(0.6) -0.35(0.8) 0.02(1.1)
  4 -0.44(0.5) -0.27(0.7) -0.21(0.8) -0.70(0.9)
  5 -0.40(0.5) -0.26(0.9) 0.001(1.0) -0.45(2.2)
  6* -0.53(0.6) -0.77(1.6) -0.17(0.4) -1.68(1.67)
  7* -0.25(0.4) -1.08(1.9) -0.29(0.6) -2.16(2.22)
  8* -0.42(0.6) -0.15(2.8) -0.43(0.6) -3.30(2.18)
  9* -0.45(0.5) -1.05(1.6) -0.39(0.6) -3.32(2.9)
  10* -0.52(0.4) -0.89(1.5) -0.15(0.8) -5.12(3.3)
  1. * Indicates significant difference (P < 0.05) between genders when muscles are grouped.
  2. † A single participant initially demonstrated difficulty with the coordination of the task resulting in her SLP value for the first contraction being highly positive. Removal of this participant's data point did not influence the statistical outcome and has therefore remained in the analysis.