Quantitative assessment of co-contraction in cervical musculature

Choi, Hyeon Ki

doi:10.1016/s1350-4533(02)00151-0

Cited by 48 publications

(33 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Previous report of muscle force based CCR showed that the co-contraction of isometric LLB (ranged from 0.27 to 0.32) was not significantly different from the one of isometric RLB (ranged from 0.30 to 0.36) (Choi 2003). Our results also showed that the magnitudes of CCR were comparable between LLB and RLB.…”

Section: Discussionsupporting

confidence: 68%

“…Previous study showed that the co-contraction of antagonists ranged from 21 to 42% during isometric flexion, and from 15 to 29% during isometric extension (Valkeinen et al 2002). The muscle force based CCR during isometric flexion (ranging from 0.30 to 0.41) was significantly different from the one during extension (ranging from 0.08 to 0.16) (Choi 2003). The CCR was also distinct between voluntary neck flexion and extension in current study.…”

Section: Discussionsupporting

confidence: 41%

“…The regulation of cocontraction is presumably an efficient adjusting mechanism for spinal stability. Nevertheless, previous studies related to the co-contraction of neck muscles were only conducted under isometric contraction in neutral posture (Choi 2003;Valkeinen et al 2002).…”

Section: Introductionmentioning

confidence: 99%

“…The muscle force/moment based procedure can be acquired by the antagonistic forces alone (van Dieen et al 2003), or the co-contraction subset over the total muscle forces (Choi 2003;Granata et al 2005). The muscle force/moment usually derives from complicated 2D/3D biomechanical models with presumed optimization method.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Co-contraction of cervical muscles during sagittal and coronal neck motions at different movement speeds

2008

View full text Add to dashboard Cite

Muscle co-contraction is important in stabilizing the spine. The effects of movement speed and direction on the cervical co-contraction were, however, not yet investigated. Surface electromyographies of three paired cervical muscles were measured in 17 young healthy subjects. The subjects performed voluntary neck movements in sagittal and coronal plane at fast, medium, and slow speeds. The co-contraction ratio was defined as the normalized integration of antagonistic electromyographic activities divided by that of total muscle activities. The results showed that the co-contraction ratio at fast speed (0.42 +/- 0.21) was smaller than that at medium (0.45 +/- 0.20) and slow (0.46 +/- 0.19) speeds (P

show abstract

Section: Discussionsupporting

confidence: 68%

Section: Discussionsupporting

confidence: 41%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Co-contraction of cervical muscles during sagittal and coronal neck motions at different movement speeds

2008

View full text Add to dashboard Cite

show abstract

“…These include reduced neck strength and recurrent pain by altering the load distribution on the spine and irritating pain sensitive structures (22). Co-activation of agonist/antagonist muscles significantly increases spinal stiffness (23) and spinal compression which is considered sufficient to induce lumbar spine injuries and consequently low-back pain (24) and may also be relevant in persistent neck pain disorders (25). The results of this study show that specific neck training, but not prescribed physical activity training, reduced the level of antagonist muscle activity during the sustained neck flexion contraction both immediately following the intervention and at the 12 months follow-up.…”

Section: Discussionmentioning

confidence: 99%

Short- and long-term effects of exercise on neck muscle function in cervical radiculopathy: A randomized clinical trial

et al. 2016

View full text Add to dashboard Cite

Purpose:To compare changes in flexor and extensor neck muscle endurance, electromyography, and ratings of fatigue and pain 14 weeks and 12 months after neck-specific training or prescribed physical activity in patients with cervical radiculopathy. Methods:Patients were randomized to either neck-specific training with a cognitive behavioral approach, or prescribed self-mediated physical activity. Surface electromyography was recorded from the sternocleidomastoid, splenius capitis, upper and lower trapezius muscles bilaterally, during sub-maximal isometric endurance tests for neck extension and flexion. Out of 75 patients, 50 participated in the final analysis of endurance time, slope of the median frequency and amplitude of the electromyography signals, and fatigue and pain ratings. Results:Neck flexion endurance improved significantly after training for groups. There was no significant change in the median frequency slope for any muscle in either group. Fatigue ratings were significantly lower for the extension tests for both groups at 14 weeks and 12 months. Neck pain intensity decreased significantly at 14 weeks and at 12 months. For the neck training group, the activation of the splenius capitis was significantly reduced during neck flexion at 14 weeks and at 12 months indicating reduced muscle co-activation. Conclusions:Exercise, whether it was specific or general, increased neck flexor endurance, and reduced perceived fatigue and pain. The neck training group only had indications of reduced coactivation of antagonist muscles during neck flexion.

show abstract

Head control strategies during whole-body turns

et al. 2006

View full text Add to dashboard Cite

Recent reports have described the motion of individual body segments during turns toward visual targets. During a whole-body turn, the head's trajectory in space is determined by both body-in-space rotation and head-on-body rotation. To inform subsequent investigations of head control strategies during turns, we provide a kinematic description of head and pelvis rotation in 20 healthy human subjects as they performed step turns toward a visible target or in the direction of a previously seen target. At the time of peak head velocity in space, the head was moving faster than the pelvis by approximately 54 degrees s(-1) when turning toward a visible target, and approximately 25 degrees s(-1) when turning in a remembered direction. Peak head velocities were slower in the absence of a visual target, but pelvis velocities were not significantly different. The pattern of relative motion between the head and pelvis followed a temporal sequence. Early in the turn, the head rotated with respect to the pelvis in the same direction as the pelvis was rotating in space. During the mid portions of the turn, en bloc rotation of the head and pelvis predominated. Later in the turn, head-in-space velocity was lower than pelvis-in-space velocity, and was thus relatively stabilized. This pattern of head movement during turns is quite similar to eye-in-head movements during large eye-head gaze shifts. This suggests that in addition to saccadic and stabilization mechanisms, a specific control strategy to move segments together should be incorporated into models of gaze reorienting behavior.

show abstract

Quantitative assessment of co-contraction in cervical musculature

Cited by 48 publications

References 14 publications

Co-contraction of cervical muscles during sagittal and coronal neck motions at different movement speeds

Co-contraction of cervical muscles during sagittal and coronal neck motions at different movement speeds

Short- and long-term effects of exercise on neck muscle function in cervical radiculopathy: A randomized clinical trial

Head control strategies during whole-body turns

Contact Info

Product

Resources

About