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Table 2 Correlation coefficients between knee extensor strength and quadriceps femoris size variables in sprinters and non-sprinters

From: Relationship of the knee extensor strength but not the quadriceps femoris muscularity with sprint performance in sprinters: a reexamination and extension

  Isometric strength Slow-velocity isokinetic strength Fast-velocity isokinetic strength
  r P value r P value r P value
Sprinters
 Proximal CSA 0.340 0.009 0.339 0.009 0.186 0.163
 Middle CSA 0.450 < 0.001 0.523 < 0.001 0.518 < 0.001
 Distal CSA 0.381 0.003 0.463 < 0.001 0.451 < 0.001
 MV 0.491 < 0.001 0.531 < 0.001 0.421 0.001
Non-sprinters
 Proximal CSA 0.290 0.070 0.193 0.234 0.196 0.225
 Middle CSA 0.577 < 0.001 0.549 < 0.001 0.515 0.001
 Distal CSA 0.585 < 0.001 0.468 0.002 0.348 0.028
 MV 0.637 < 0.001 0.520 0.001 0.453 0.003
  1. CSA cross-sectional area, MV muscle volume