Table 5.

Correlation coefficients between rate of torque development, echo intensity, and functional tests (n = 45)

	RTD at 0–0.05 s	RTD at 0–0.1 s	RTD at 0–0.25 s	RTD at 0–0.3 s
RFEI (A.u.)	−0.268	−0.305*	−0.314*	−0.308*
VLEI (A.u.)	−0.426**	−0.441**	−0.417**	−0.644**
VIEI (A.u.)	−0.203	−0.303	−0.363*	−0.376*
VMEI (A.u.)	−0.236	−0.295	−0.355*	−0.384*
QEI (A.u.)	−0.290	−0.346*	−0.386*	−0.386**
QMT (A.u.)	0.385*	−0.465**	0.508**	0.545**
30SS (reps)	0.282	0.306*	0.340*	0.348*
UGS (m/s)	0.299*	0.284	0.371*	0.393**

RTD rate of torque development, RFEI rectus femoris echo intensity, VLEI vastus lateralis echo intensity, VIEI vastus intermedius echo intensity, VMEI vastus medialis echo intensity, QEI quadriceps femoris echo intensity, QMT quadriceps femoris muscle thickness, 30SS 30-s sit-to-stand-up test, UGS usual gait speed

*P < 0.05; **P < 0.01 (statistical difference)