Table 2. Descriptive statistics for muscle onset latency between groups and velocities.

Muscle Onset (ms)	PFPS (Mean ± SD)		Healthy (Mean ± SD)
	Low velocity	High velocity	Low velocity	High velocity
Gluteus maximus	−518.7 ± 437.2	−202.0 ± 339.0	−462.5 ± 688.2	−213.2 ± 330.2
Anterior gluteus medius	−524.5 ± 669.6	−195.2 ± 356.8	−206.2 ± 457.5	−136.2 ± 215.4
Posterior gluteus medius	−657.4 ± 689.4	−265.8 ± 456.1	753.7 ± 1,117.5	−230.7± 485.7
Rectus femoris	15.9 ± 422.9	19.9 ± 263.1	78.7 ± 247.9	−41.7 ± 123.9
Vastus medialis	32.4 ± 371.9	−70.4 ± 224.0	226.2 ± 299.8	−66.7 ± 155.4
Vastus lateralis	11.1 ± 434.4	−61.8 ± 274.3	175.3 ± 335.5	−44.7 ± 176.2
Biceps femoris	−28.4 ± 693.8	2.5 ± 397.9	778.3 ±1,441.6	346.0 ± 662.6

PFPS: patellofemoral pain syndrome; SD: standard deviation.