Comparison of muscle activity of wrist extensors and kinematics of wrist joint during wrist extension in automobile assembly line workers with and without lateral epicondylitis.
BACKGROUND
Overuse of the extensor carpi radialis (ECR) may play a role in the development of lateral epicondylitis (LE). However, no studies have investigated the muscle activity ratio between the ECR and extensor carpi ulnaris (ECU) associated with the kinematics during wrist extension in workers with LE.


OBJECTIVE
We compared the ratio (ECR/ECU) of muscle activity between the ECR and ECU and the kinematics of the wrist during wrist extension between workers with and without LE.


METHODS
Fifteen automobile assembly line workers with LE and 15 workers without LE participated in this study. The ratio of muscle activity was measured using surface electromyography, and wrist kinematics were measured by a three-dimensional motion analysis system while the workers extended their wrists actively to the maximum range to which they did not feel uncomfortable.


RESULTS
Significantly greater ratios of muscle activity, ranges of radial deviation, and combined motion of radial deviation and extension (CMDE) were shown in workers with LE compared to those without LE. Also, the range of wrist extension was significantly lower in workers with LE than in those without LE.


CONCLUSIONS
Quantifying the ratio of muscle activity with altered kinematics of wrist extension may help researchers to understand why overuse of ECR is occurring and explain LE development in automobile assembly line workers.
Department of Physical Therapy, Graduate School, Yonsei University, Wonju, South Korea.
Sung-Dae
SD
Choung
Department of Physical Therapy, College of Medical Science, Jeonju University, South Korea.
Kyue-Nam
KN
Park
Department of Physical Therapy, Graduate School, Yonsei University, Wonju, South Korea.
Si-Hyun
SH
Kim
Department of Physical Therapy, College of Health Science, Laboratory of Kinetic Ergocise Based on Movement Analysis, Yonsei University, Wonju, South Korea.
Oh-Yun
OY
Kwon
Electromyography; extensor carpi radialis; extensor carpi ulnaris; workers