Isokinetic Knee Function in Healthy Subjects With and Without Kinesio Taping
Wong O., Cheung R., Li R. Physical Therapy in Sport, 2012
Kinesio Taping has been used by clinicians for over 30 years, but limited research has been done investigating the mechanism behind its effectiveness. Application of the tape with the KT Method can be used to influence muscle, tendons, ligaments and joint biomechanics. Research is particularly limited regarding KT muscle application. Therefore, the purpose of this study was to evaluate the effectiveness of KT quadriceps muscle taping through isokinetic knee flexion and extension strength measures. Thirty healthy participants were included in this study. All participants completed maximum concentric knee extension and flexion measures on an isokinetic dynamometer with and without KT quadriceps muscle application. The tasks were completed at 3 different angular velocities (60, 120, 180 °/sec) with 10 repetitions each. The order of taped and untaped trials was randomized and subjects were tested on 2 separate days with at least 7 days rest in between to avoid any potential carryover effect. The tape was applied to the vastus medialis muscle with the participant in a supine position and the knee flexed to 30°. One investigator applied the tape from muscle origin to insertion with 75% tension. This was done to promote muscle facilitation as per the KT Method. The measures evaluated during the isokinetic testing were peak torque, total work, and time to peak torque of both the quadriceps and hamstring musculature. The authors found that peak torque measures and total work of knee extension and flexion were not significantly different between taped and untaped conditions at all angular velocities. However, there was a significant difference in time to peak torque for knee extension measures in taped and untaped conditions for all angular velocities. With the taped condition, the time to peak torque for knee extension was decreased (36-101 ms) compared to the untaped condition. No differences were found for knee flexion time to peak torque measures at all angular velocities.
The use of KT for facilitation of the quadriceps muscle did not show an increase in peak torque and total work done as measured by isokinetic testing of knee flexion and extension. However, there was a decrease in the time to peak quadriceps muscle torque. This supports the theoretical basis of the KT muscle facilitation application. The intention of the muscle facilitation taping is not to increase muscle strength, but to assist the muscle by stimulating cutaneous mechanoreceptors which may alter the firing rate of motor units [Ridding, 2000; Hsu, 2009; MacGregor, 2005]. The superficial effect of the tape alone is not enough to increase muscle force output, but enough to improve activation. These findings are consistent with other studies that have found early activation of the vastus medialis oblique (VMO) musculature during a stepping task [Chen, 2007]. The authors of this study have suggested that this early onset of quadriceps muscle facilitation may contribute to injury prevention and improve rehabilitation. This technique may also be an additional treatment modality to use while strengthening the quadriceps musculature, but I struggle to see how this taping could prevent injury during athletic play. Further evaluation of a strengthening protocol with and without KT may be beneficial to better understand of the mechanism behind this taping. Do you think that this taping technique would be beneficial in rehabilitation? Are you surprised that the taping did not influence total work done?
Written By: Kathleen White
Reviewed By: Jeffrey Driban