To
investigate and describe the influence of intra-articular effusion
on knee joint kinematics and electromyographic (EMG) profiles during
jogging. Thirteen individuals underwent a 20 cc 0.9% saline insufflation
of the knee joint capsule and completed 8 jogging trials. Stance phase,
sagittal plane knee joint kinematics and thigh muscular EMG profiles
were compared pre- and post-insufflation utilizing a paired t-test
( = 0.05). Mild knee effusion
caused a reduction in vastus medialis (p = 0.005) and lateralis (p
= 0.006) EMG activity. The rectus femoris, biceps femoris and medial
hamstring muscles did not exhibit changes due to this protocol. There
were no changes in the sagittal plane knee joint kinematic pattern.
Twenty cc effusion can cause quadriceps inhibition in the vastus medialis
and the vastus lateralis in otherwise healthy individuals during jogging.
This study provides baseline data for the effects of mild knee joint
effusion on thigh musculature during jogging.
KEY
WORDS: Electromyography (EMG), kinematics, jogging, muscle inhibition,
knee.
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