Table 1: Comparison of baseline variables between the EQI, ECC and control group. Outcome Variables EQI Group (n = 15) ECC Group (n = 15) Control Group (n = 16) Difference Mean SD Mean SD Mean SD F-Value p ATT (mm) 4.782 0.526 4.880 0.496 4.760 0.648 0.196 0.823 ATS (kPa) 127.044 22.853 117.551 15.364 115.640 12.831 1.870 0.166 MGFL (cm) 5.118 0.911 4.983 0.703 5.210 0.606 0.359 0.701 MGPA (°) 20.9 2.063 20.033 2.310 19.438 2.489 1.578 0.218 MGT (cm) 1.959 0.337 1.843 0.340 1.876 0.262 0.546 0.583 LGFL (cm) 5.339 0.560 4.993 0.737 5.499 0.883 1.870 0.166 LGPA (°) 14.000 3.793 14.100 2.123 13.188 1.948 0.524 0.596 LGT (cm) 1.407 0.446 1.178 0.243 1.279 0.249 1.871 0.166 ODF (°) 10.600 3.019 12.670 4.776 12.560 4.993 1.075 0.350 CDF (°) 18.930 5.824 20.130 4.172 21.560 7.865 0.702 0.501 CS (Nm) 228.387 51.503 237.434 58.882 228.592 62.260 0.121 0.886 ES (Nm) 221.372 50.077 232.705 62.823 222.979 64.004 0.161 0.852 IS(Nm) 194.256 49.299 195.824 47.654 194.186 51.156 0.005 0.995 Time under tension (s) 122.639 46.702 113.127 34.743 109.398 44.934 0.396 0.676 Total torque impulse (Nm s/MVIC) 93.173 37.141 86.249 26.307 82.720 34.560 0.399 0.674 Angular velocity (°/s) -1.181 0.711 -1.075 0.243 -1.166 0.459 0.194 0.825 ATS – Achilles tendon stiffness; ATT – Achilles tendon thickness; CDF – closed kinetic chain ankle dorsiflexion; CS – concentric strength; ECC – eccentric; EQI – eccentric quasi-isometric; ES – eccentric strength; IS – isometric strength; LGFL – lateral gastrocnemius fascicle length; LGPA – lateral gastrocnemius pennation angle; LGT – lateral gastrocnemius thickness; MGFL – medial gastrocnemius fascicle length; MGPA – medial gastrocnemius pennation angle; MGT – medial gastrocnemius thickness; ODF – open kinetic chain ankle dorsiflexion; SD – standard deviation