Isokinetic strength training

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Abstract
Isokinetic exercise programs were compared as the number of times per week subjects performed the exercise. Isokinetic exercise of the right knee extensors was performed on 23 women aged 18-24 yr who had no history or evidence of knee pathology. Pre- and posttests included maximum isometric and isokinetic torque measurements of the right and left knee extensors. Weekly strength testing was also done. One group performed the isokinetic exercise (3 sets, 8 repetitions/set at 10 rpm) daily for 5 days; 1 group performed the same isokinetic exercise protocol every other day, 3 times per week. The experimental period lasted 6 consecutive wk. Strength gains of the exercised leg were significant in both groups, but no significant differences in strength gains were found between the 2 groups after a period of 6 wk of exercise, supporting the rationale for offering exercise programs 3 times weekly. Strength gain curves were plotted weekly for the 6-wk period. The average strength gain curves for both exercise groups as tested isometrically or isokinetically showed a decrease in strength between the 2nd and 3rd wk, which was not statistically significant but was consistent in all subjects.

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