The Effect of Cryotherapy on Proprioception and Knee Extensor Torque in Healthy Volunteers

This study was done to investigate the influences of cryotherapy on the joint position sense (JPS) and extensor muscles torque of the knee.

Forty healthy volunteers (20 men, 20 women; age range, 21 – 30 y) participated. Two cooling pads were applied to the knee and anterior thigh for 15 minutes at 4°C. The accuracy of the knee JPS was evaluated before and after cooling in two angles, including 45° and 60° flexion. Extensor muscles torque of the knee was obtained in two velocities of 30°/s and 120°/s.

The effect of time and the interaction between the group and time were not significant for both active and passive repositioning error tests of the knee joint angles (P ≥ 0.05). The knee extensor’s muscle torque increased significantly during both velocities of 30°/s and 120°/s, immediately and 30 minutes after the cryotherapy in the experimental group (P ≤ 0.01). Cooling for 15 minutes made a higher knee extensor muscle torque and did not change the JPS.

These findings should be considered for therapeutic programs that involve exercise immediately after a period of cryotherapy.