Date of Award


Document Type


Degree Name

Master of Science (MS)


Kinesiology & Public Health Education


Isokinteic exercise is a valid, reliable, and objective method of evaluating and improving muscle fitness. It is utilized in rehabiltation, athletics, and research. A common isokinetic tool is the Cybex II Isokinetic System.

To be of maximal value, an instrument requires normative data specific to the population it was designed to test and train. This study establishes (selected) normative data for the quadriceps and hamstrings muscles of males and females ages 36 through 40.

Sixty adults, meeting specific age, medical, and activity requirements were tested on the Cybex II System. Reciprocal contractions of the quadriceps and hamstrings were performed at 60 degrees/s, 180 degrees/s, and 300 degrees/s angular velocites. Peak torque measurements were measured, recorded, and then analyzed according to acceptable statistical methods.

The following results were obtained: Peak torque values for women were 49 to 58 percent of those for men. Mean peak torque values and T-scale scores were calculated for both sexes, both muscle groups, all velocities. No significant differences were found in torque values between kick dominant and nondominant lower extremities. Significant differences were found between torque dominant and nondominant muscle groups for both men and women; the difference was within 15 percent at 300 degrees/s, and within 10 percent at the remaining velocities. The hamstrings to quadriceps ratio was 0.62 at 60 degrees/s, 0.72 at 180 degrees/s and 0.84 at 300 degrees/s, and similar for males and females. Peak torque decreased with increasing velocity, but the percentage change varied between muscle groups and between sexes. The rate of tension development identified also varied between muscle groups and between males and females.

Isokinetic normative data, and the interrelationships established, will be useful in rehabilitative medicine when a "normal" contralateral limb is not physically or functionally available for comparative measurement; data will assist in goal setting and charting of progress. It will also assist in providing an age continuum of normative data so that age related changes in these muscle fitness components may be quantified.