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