Table 2.

Kinetic Variables for the Right Lower Extremity and Trunk (Mean ± SD)

Kinetic Variable	Height
	0.30 m		0.50 m
	No VPAC	VPAC	No VPAC	VPAC
Vertical ground reaction force, N	1352.2 ± 471.9	1283.6 ± 379.2	1745.2 ± 568.4	1623.9 ± 485.7
Ankle-flexion moment, Nm	59.5 ± 31.5	51.6 ± 40.3	68.2 ± 42.8	69.5 ± 34.3
Ankle-inversion moment, Nm	11.9 ± 21.8	11.7 ± 20.3	15.5 ± 28.1	11.6 ± 15.8
Knee-flexion moment, Nm	38.2 ± 38.9	38.7 ± 37.8	−67.9 ± 38.3	−68.7 ± 46.6
Knee-abduction moment, Nma	−40.2 ± 6.6	−21.0 ± 6.4	46.4 ± 46.6	40.5 ± 34.3
Hip-flexion moment, Nm	143.8 ± 83.5	133.1 ± 61.9	208.2 ± 86.8	200.2 ± 87.3
Hip-abduction moment, Nm	100.5 ± 215.4	54.6 ± 116.1	71.7 ± 135.4	−78.2 ± 189.6
Ankle-energy absorption, W	−13.9 ± 44.7	−19.8 ± 42.9	157.8 ± 274.5	94.8 ± 160.0
Knee-energy absorption, Wa	−29.7 ± 64.1	−37.3 ± 69.0	373.1 ± 300.9	481.1 ± 286.7
Hip-energy absorption, Wb	−8.8 ± 15.7	−13.8 ± 20.2	301.6 ± 254.3	277.6 ± 253.6

Abbreviation: VPAC, preemptive abdominal contraction.

^aVPAC effect for the 0.30-m height (P < .05).

^bVPAC effect for the 0.50-m height (P < .05).