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Archive > Year 2010, Number 1

The Comparative Effectiveness Of Isotonic And Isokinetic Strength Trainings On Quadriceps Peak Torque


Authors

Agnihotri Hitanshu, Maharishi Markandeshwar Institute of Physiotherapy & Rehabilitation, Maharishi Markandeshwar University
Kapoor Soniya, Maharishi Markandeshwar Institute of Physiotherapy & Rehabilitation, Maharishi Markandeshwar University

Abstract

The present study compares the effectiveness of isotonic and isokinetic exercises on peak torque of the quadriceps in 45 healthy young males. The subjects were randomly assigned into 3 groups (n=15): Group A-Isotonic group, Group B-Isokinetic group, Group C-Control group. Peak torque of the quadriceps at velocities of 2200/sec and 1000/sec was tested twice with a gap of 4 weeks using isokinetic dynamometer. The isotonic protocol included 3 sets of 10 repetitions at 50% 10 RM, 75% 10 RM and 100% 10 RM with a 1-minute rest interval between the sets. The isokinetic protocol consisted of one set of 10 repetitions at velocities of 2200/sec, 1600/sec, 1000/sec, and 400/sec each with a 1-minute rest interval between the sets. Each exercise protocol was performed thrice a week for 4 weeks. The subjects in the control group were not prescribed any kind of exercise training. The comparison of peak torque values at 2200/sec (F=3.17, p>0.05) and 1000/sec (F=1.56, p>0.05) at baseline with one way ANOVA showed statistically non-significant differences in all the groups. Post-test one way ANOVA revealed significant differences at 2200/sec (F= 4.47, p<0.05) between and within the groups. Isotonic exercises were found to be more effective than isokinetic exercises in increasing the peak torque at high velocity.

Keywords

isotonic, isokinetic, peak torque, strength training, quadriceps

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