Ll. Tis et al., EFFECT OF PRELOAD AND RANGE OF MOTION ON ISOKINETIC TORQUE IN WOMEN, Medicine and science in sports and exercise, 25(9), 1993, pp. 1038-1043
The purposes of this study were to compare the effects of two preload
settings (0 N, 75 N) and two ranges of motion (5-90-degrees-ROM, 25-70
-degrees-ROM) on torque output of the knee musculature. Twenty females
were randomly assessed for isokinetic concentric (CON) and eccentric
(ECC) torque of the knee extensor (EXT) and flexor (FLEX) musculature
at a velocity of 1.62 rads.s-1. Two four-way ANOVAs (muscle x mode x r
ange of motion x preload) revealed significant differences in average
torque between the preload and range of motion conditions (CONEXT: 5-9
0-degrees-ROM, 75 N = 74.3 +/- 17.2 Nm; 5-90-degrees-ROM, 0 N = 68.3 /- 17.2 Nm; 25-70-degrees-ROM, 75 N = 79.0 +/- 13.0 Nm; 25-70-degrees-
ROM, 0 N = 71.5 +/- 20.8 Nm) (ECCEXT: 5-90-degrees-ROM, 75 N = 85.6 +/
- 28.6 Nm; 5-90-degrees-ROM, 0 N = 82.8 +/- 27.8 Nm; 25-70-degrees-ROM
, 75 N = 97.7 +/- 23.4 Nm; 25-70-degrees-ROM, 0 N = 93.6 +/- 26.5 Nm)
(CONFLEX: 5-90-degrees-ROM, 75 N = 43.5 +/- 9.2 Nm; 5-90-degrees-ROM,
0 N = 43.1 +/- 5.6 Nm; 25-70-degrees-ROM, 75 N = 44.2 +/- 8.9 Nm; 25-7
0-degrees-ROM, 0 N = 41.2 +/- 8.9 Nm) (ECCFLEX: 5-90-degrees-ROM, 75 N
= 56.7 +/- 16.3 Nm; 5-90-degrees-ROM, 0 N = 55.6 +/- 17.8 Nm; 25-70-d
egrees-ROM, 75 N = 57.3 +/- 14.0 Nm; 25-70-degrees-ROM, 0 N = 51.8 +/-
14.0 Nm) (P < 0.05). No differences in peak torque values were observ
ed. Based on the findings of this study, preload and range of motion s
hould remain constant between and among subjects if average torque is
used as a criterion measure.