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Table 2 Correlation coefficients between absolute and relative CSAs of trunk and lower limb muscles and personal best 100-m sprint time in sprinters

From: Trunk and lower limb muscularity in sprinters: what are the specific muscles for superior sprint performance?

  r [the upper and lower limit of a 95% CI] P value
Absolute CSA
 Rectus abdominis − 0.009 [− 0.271, 0.255] 0.945
 Lateral abdominal wall − 0.200 [− 0.440, 0.066] 0.140
 Erector spinae − 0.119 [− 0.149, 0.370] 0.383
 Psoas major − 0.388 [− 0.591, − 0.139] 0.003
 Gluteus maximus − 0.366 [− 0.574, − 0.114] 0.006
 Quadriceps femoris − 0.040 [− 0.300, 0.225] 0.767
 Hamstring − 0.107 [− 0.360, 0.160] 0.434
 Adductors − 0.092 [− 0.347, 0.175] 0.502
 Dorsiflexors 0.088 [− 0.179, 0.343] 0.521
 Plantar flexors − 0.132 [− 0.382, 0.136] 0.332
Relative CSA
 Rectus abdominis 0.041 [− 0.224, 0.301] 0.761
 Lateral abdominal wall  − 0.169 [− 0.414, 0.098] 0.213
 Erector spinae − 0.064 [− 0.321, 0.202] 0.639
 Psoas major − 0.363 [− 0.571, − 0.111] 0.006
 Gluteus maximus − 0.387 [− 0.590, − 0.138] 0.003
 Quadriceps femoris 0.040 [− 0.225, 0.300] 0.769
 Hamstring − 0.056 [− 0.314, 0.210] 0.679
 Adductors − 0.020 [− 0.281, 0.244] 0.884
 Dorsiflexors 0.170 [− 0.097, 0.414] 0.209
 Plantar flexors − 0.082 [− 0.338, 0.185] 0.548
  1. Bold values indicate significant correlations (P < 0.05) between CSA variables and personal best 100-m sprint time