Exploring the Relationship between Ultrasonographic Measures of the Quadriceps and Knee Extensor Muscle Fitness in Endurance-Trained Individuals

Table 2

Muscle fitness and ultrasonography outcomes.

Measure	Mean ± SD
1 repetition maximum	44 ± 17.3 kg
Total repetitions	71 ± 22
Muscle thickness
Rectus femoris	2.60 ± 0.50 cm
Vastus intermedius	2.71 ± 0.62 cm
Vastus lateralis	2.48 ± 0.70 cm
Echo intensity
Rectus femoris	120.78 ± 22.33 a.u.
Vastus intermedius	69.80 ± 12.76 a.u.
Vastus lateralis	112.21 ± 21.46 a.u.
Corrected echo intensity
Rectus femoris	123.16 ± 26.03 a.u.
Vastus intermedius	121.34 ± 26.92 a.u.
Vastus lateralis	149.79 ± 38.17 a.u.