To obtain the isokinetic normative data of isokinetic laboratory of department of Rehabilitation Medicine in the Chungnam National University Hospital, isokinetic evaluation of knee extensors and flexors at speed of 60⁗/sec, 180⁗/sec with the Cybex Ⅱ⁺ Isokinetic Dynamometer was performed in 30 males and 10 females volunteered among medical students of Chungnam National University.

The results were as follows;

1) The mean peak torque of knee extensors at speed of 60⁗/sec were 124 ft-lbs both limbs, and the mean ratio of peak torque to body weight of knee extensors at speed of 60⁗/sec, 180⁗/sec were 85%, 55%, respectively in both limbs.

2) The mean peak touque of knee flexors at speed of 60⁗/sec in dominant and non-dominant limb were 70 ft-lbs, 69 ft-lbs, respectively, and the peak torque to body weight of knee flexors at speed of 60⁗/sec in dominant and non-dominant limb were 48%, 47%, respectively, and at speed of 180⁗/sec those were 36% in both limbs.

3) The mean endurance ratio of knee extensors at speed of 180⁗/sec in domanant and non-dominant limb were 54%, 50%, respectively, and the mean peak torque acceleration energy of knee extensors at speed of 180⁗/sec in dominant and non-dominant limb were 19.5 ft-lbs, 19.3 ft-lbs, respectively.

4) The mean endurance ratio of knee flexors at speed of 180⁗/sec in dominant and non-dominant limb were 59%, 58%, respectively, and the mean peak torque acceleration energy of knee flexors at speed of 180⁗/sec in dominant and non-dominant limb were 11.4 ft-lbs, 11.7 ft-lbs, respectively.

5) The mean H/Q ratio at speed of 60⁗/sec in both limbs were 57%, and the mean H/Q ratio at speed of 180⁗/sec in both limbs were 67%

6) The mean total work of knee extensors at speed 180⁗/sec in dominant and non-dominant limb were 1.590 ft-lbs, 1.509 ft-lbs, respectively, and the mean average power of knee extensors at speed of 180⁗/sec in dominant and non-dominant limb were 179 watts, 170 watts, respectively.

7) The mean total work of knee flexors at speed of 180⁗/sec in dominant and non-dominant limb were 1.143 ft-lbs, 1.095 ft-lbs, respectively, and the mean average power of knee flexors at speed of 180⁗/sec in dominant and non-dominant limb were 127 watts, 121 watts, respectively.

8) The mean work ratio of flexors to extensors at the speed of 180⁗/sec in dominant and non-dominant limb were 73%, 74%, respectively.

9) The mean average of motion of knee extension at speed of 180⁗/sec in dominant and non-dominant limb were 86⁗, 87⁗, respectively, and the mean average range of motion of knee flexion at speed 180⁗/sec in dominant and non-dominant limb were 87⁗, 88⁗, respectively.

In female subjects;

1) The mean peak torque of knee extensors at speed of 60⁗/sec in dominant and non-dominant limb were 73 ft-lbs, 71 ft-lbs, respectively, and mean ratio of peak torque to body weigth of knee extensors at speed of 60⁗/sec in dominant and non-dominant limb were 65%, 63%, respectively, and at speed of 180⁗/sec those were 38% in both limbs.

2) The mean peak torque of knee flexors at speed of 60⁗/sec in dominant and non-dominant limb were 39 ft-lbs, 38 ft-lbs, respectively, and the mean ratio of peak torque to body weight of knee flexors at speed 60⁗/sec in dominant and non-dominant limb were 25⁗, 24⁗, respectively.

3) The mean endurance ratio of knee flexors at speed of 180⁗/sec in dominant and non-dominant limb were 53%, 46%, respectively. the mean peak torque acceleration energy of knee extensors at speed of 180⁗/sec in dominant and non-dominant limb were 11.2 ft-lbs, 10.5 ft-lbs, respectively.

4) The mean endurance ratio of knee flexors at speed of 180⁗/sec in dominant and non-dominant limb were 65%, 66%, respectively. the mean peak torque acceleration energy of knee flexors at speed of 180⁗/sec in dominant and non-dominant limb were 6.8 ft-lbs, 6.4 ft-lbs respectively.

5) The mean H/Q ratio at speed of 60⁗/sec in dominant and non-dominant limb were 55%, 54% respectively, and the mean H/Q ratio at speed of 180⁗/sec in dominant and non-dominant limb were 64%, 63% respectively.

6) The mean total work of knee extensors at speed of 180⁗/sec in dominant and non-dominant limb were 710 ft-lbs, 697 ft-lbs, respectively, and the mean average power of knee extensors at speed 180⁗/sec in dominant and non-dominant limb were 58 watts in both.

7) The mean total work knee flexors at speed of 180⁗/sec in dominant and non-dominant limb were 511 ft-lbs, 507 ft-lbs, respectively, and the mean average power of knee flexors at speed of 180⁗/sec in dominant and non-dominant limb were 58 watts, 59 watts, respectively.

8) The mean work ratio of knee flexors to extensors at speed of 180⁗/sec were 75%, in both limbs.

9) The mean average range of motion of knee extension at speed of 180⁗/sec in dominant and non-dominant limb were 82⁗, 80⁗, respectively, and the mean average range of motion of knee flexion at speed 180⁗/sec in dominant and non-dominant limb were 82⁗, 81⁗, respectively.

Significant differences of isokinetic strengths between dominant and non-dominant limb in all subjects were not found and male subjects showed superiority in overall test parameters except endurance ratio compared with female subjects.