The Comparative effectiveness of Isokinetic and Isotonic Strength Trainings on Quadriceps Maximum Power.

摘要

Normal 0 false false false MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} 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 220 0 /sec, 160 0 /sec 100 0 /sec and 40 0 /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 220 0 /sec, 160 0 /sec, 100 0 /sec, and 40 0 /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 220 0 /sec (t=7.15, p<0.001), 160 0 /sec (t=7.54, p<0.001), 100 0 /sec (t=9.24, p<0.001) and 40 0 /sec (t=7.59, p<0.001) in Group A, also at 220 0 /sec (t=8.56, p<0.001), 160 0 /sec (t=8.80, p<0.001), 100 0 /sec (t=10.11, p<0.001) and 40 0 /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 220 0 /sec (F= 10.85, p<0.001), 160 0 /sec (F=16.96, p<0.001), 100 0 /sec (F=14.60, p<0.001) and 40 0 /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.