Original article
English
Agnihotri H, kapoor S
Department of Physiotherapy, Maharishi Markandeshwar University, Mullana, Ambala, Haryana, India
IJMBS 2010;2(1):24-31
Abstract
The present study compares the effectiveness of isokinetic and Isotonic exercises on maximum power of quadriceps in 45 healthy young males. The subjects were randomly assigned into 3 groups (n=15): Group A- Isokinetic group, Group B- Isotonic group, Group C-Control group. Maximum power of quadriceps at velocities of 2200/sec, 1600/sec 1000/sec and 400/sec was tested twice with a gap of 4 weeks using isokinetic dynamometer. The isokinetic protocol consisted of one set of 10 repetitions at velocities of 2200/sec, 1600/sec, 1000/sec, and 400/sec each while, the Isotonic protocol included 3 sets of 10 repititions at 50% 10 RM, 75% 10 RM and 100% 10 RM. Each exercise protocol was performed thrice a week for 4 weeks with 1 minute rest interval. The subjects in the control group were not prescribed any kind of exercise training. Paired t-test showed significant changes at 2200/sec (t=7.15, p<0.001), 1600/sec (t=7.54, p<0.001), 1000/sec (t=9.24, p<0.001) and 400/sec (t=7.59, p<0.001) in Group A, also at 2200/sec (t=8.56, p<0.001), 1600/sec (t=8.80, p<0.001), 1000/sec (t=10.11, p<0.001) and 400/sec (t=10.50, p<0.001) in Group B and non-significant changes in Group C. Post-test One way ANOVA revealed significant changes at 2200/sec (F= 10.85, p<0.001), 1600/sec (F=16.96, p<0.001), 1000/sec (F=14.60, p<0.001) and 400/sec (F=14.00, p<0.001). Isotonic exercises were found to be more effective than Isokinetic exercises in increasing the maximum power at high velocity. Keywords: The Comparative effectiveness of Isokinetic and Isotonic Strength Trainings on Quadriceps Maximum Power. Link/DOI: http://journals.sfu.ca/ijmbs/index.php/ijmbs/article/view/48/131