Abstract
The purpose of this investigation was to examine the effects of dynamic constant external
resistance (DCER) training on isokinetic peak torque (PT) and constant joint angle
(CJA) torque at velocities from zero to 5.03 rad · s-1. Twelve male volunteers (X̄ age±SD = 21.67±2.61 years) were trained using DCER exercises
(leg extension and squat) for eight weeks. The subjects were tested pre-training and
post-training for isokinetic leg extension PT as well as CJA torque (0.26 rad below
the horizontal plane) at multiple velocities (zero, 0.84, 1.68, 2.51, 3.35, 4.19 and
5.03 rad · s-1) using a Cybex II isokinetic dynamometer. Film analyses indicated that the mean training
velocities for leg extension and squat were 1.50±0.20 rad·s-1 and 1.41±0.26 rad · s-1, respectively. Univariate two-way repeated measures (within subjects design) ANOVAs
[time (pre-training versus post-training) × velocity] were used to analyze the changes
in PT and CJA torque across the training period. There was no interaction but a significant
(p<0.05) main effect for time for the CJA torque measures. The increases in CJA torque
ranged from 6.3 to 10.7%. For PT, there was a significant (p<0.05) time × velocity
interaction. Post-hoc comparisons showed that PT increased significantly at all velocities
(p<0.0083) as a result of the training (8.1 to 10.9%). The results of this investigation
indicated that DCER training significantly increased isokinetic PT and CJA torque
values at velocities up to 3.53 rad · s-1 above the training velocity.
Key words
Strength - leg extension - squat
