Introduction: Fatigue of the neck muscles can lead to change in upper limb proprioception, motor patterns and kinematics. Restricted range of motion is a characteristic of myofascial trigger point. There is no evidence indicating an association of fatigue with restricted range of motion and non specific myofascial pain syndrome without underlying disease. This study evaluates cervical motions in flexion/extension, side bending and rotation before and after fatigue. Clinically, proprioception is evaluated using the Joint Position Sense Error (JPSE), which reflects a person's ability to accurately return his head to a predefined target after a cervical movement. This study design is randomized control trial. Methods: 23 healthy right handed volunteers (11 males and 12 females) from a physical therapy clinic in rehabilitation faculty participated in the study. Fatigue protocol was done, the recordings of pain threshold and intensity and kinematics, before and after fatigue, were all repeated. Results: Neck muscle fatigue had different effects on neck kinematics for each group. JPSE in neck side bending repositioning was significantly greater following the upper trapezius muscle fatiguing protocol in a frontal plane. Conclusion: The increased accuracy was most pronounced for movements directed towards the activated side. Hence, prolonged unilateral neck muscle contraction may increase the sensitivity of cervical proprioceptors. Cervical range of motion in side bending was the only variable associated with changes in neck pain. Level of evidence: IIIb.
[Purpose] To evaluate the intra- and inter-session reliability of dynamic postural
control in ACL reconstruction and matched control athletes. [Subjects and Methods] By
using force plate, the postural controls of both groups (20 ACLR and 20 healthy matched
controls) were assessed during the transitional task from DLS to SLS. The outcome
variables included COP displacement and area and the mean velocity of COP. [Results] The
balance measures had moderate to high correlation for area (ICC=0.64–0.73) and rang of
fore-aft (Rfa) (ICC=0.66–0.80) in the ACLR group and Rfa (ICC=0.70–0.86) in the healthy
group. High to very high reliability was seen for rang of sideway (Rsw) (ICC=0.76–0.96)
and mean velocity (Mv) (ICC=0.81–0.98) in ACLR and area (ICC=0.70–0.98) and Rsw
(ICC=0.84–0.98) and Mv (ICC=0.89–0.97) in the healthy group. [Conclusion] Force plate
measures of postural control demonstrated moderate to very high reliability in athletes
with and without ACLR during the transitional task. The results of the recent study showed
that the assessment of transitional task postural control in athletes with ACLR may
reliably be incorporated in the evaluation of the physical function.
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