Trunk stabilization during sagittal pelvic tilt: from trunk-on-pelvis to trunk-in-space due to vestibular and visual feedback

Drunen, Paul van; Helm, F.C.T. van der; Dieën, Jaap H. van; Happee, Riender

doi:10.1152/jn.00867.2015

Cited by 13 publications

(16 citation statements)

References 27 publications

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“…The vestibular system encodes linear acceleration by otolith afferents and angular velocity by semicircular canal afferents (Angelaki and Cullen, 2008). In previous studies using platform induced perturbations, we found that head rotations were negligible relative to upper body rotations, while head translations were more substantial (van Drunen et al, 2015;van Drunen et al, 2016). This suggests limited input to the semicircular canals compared to the otoliths, especially when considering the detection thresholds of these sub-systems (Sadeghi et al, 2007;Yu et al, 2012).…”

Section: Discussionmentioning

confidence: 73%

“…Here all tests were performed on a rigid support surface, under small amplitude perturbations, conditions that were chosen as representative for functional tasks. In addition, differences between frontal plane and sagittal plane stabilization may account for this disparity, since our recent work suggested very limited contributions of VES feedback to sagittal plane stabilization even on a moving surface (van Drunen et al, 2015;van Drunen et al, 2016). Finally, Goodworth and Peterka (2009) modelled the VES contributions as velocity feedback, whereas we modelled the VES contribution as acceleration feedback.…”

Section: Discussionmentioning

confidence: 99%

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Sensory contributions to stabilization of trunk posture in the sagittal plane

Dieën

Drunen

Happee

2018

Journal of Biomechanics

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Trunk stabilization is required to control posture and movement during daily activities. Various sensory modalities, such as muscle spindles, Golgi tendon organs and the vestibular system, might contribute to trunk stabilization and our aim was to assess the contribution of these modalities to trunk stabilization. In 35 healthy subjects, upper-body sway was evoked by continuous unpredictable, force-controlled perturbations to the trunk in the anterior direction. Subjects were instructed to either 'maximally resist the perturbation' or to 'relax but remain upright' with eyes closed. Frequency response functions (FRFs) of admittance, the amount of movement per unit of force applied, and reflexes, the modulation of trunk extensor activity per unit of trunk displacement, were obtained. To these FRFs, we fitted physiological models, to estimate intrinsic trunk stiffness and damping, as well as feedback gains and delays. The different model versions were compared to assess which feedback loops contribute to trunk stabilization. Intrinsic stiffness and damping and muscle spindle (short-delay) feedback alone were sufficient to accurately describe trunk stabilization, but only with unrealistically low reflex delays. Addition of muscle spindle acceleration feedback or inhibitory Golgi tendon organ feedback yielded realistic delays and improved the model fit, with a significantly better model fit with acceleration feedback. Addition of vestibular feedback did not improve the model fit. In conclusion, muscle spindle feedback and intrinsic mechanical properties are sufficient to describe trunk stabilization in the sagittal plane under small mechanical perturbations, provided that muscle spindles encode acceleration in addition to velocity and position information.

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Section: Discussionmentioning

confidence: 73%

Section: Discussionmentioning

confidence: 99%

Sensory contributions to stabilization of trunk posture in the sagittal plane

Dieën

Drunen

Happee

2018

Journal of Biomechanics

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“…Additionally, many actions and tasks are executed from a sitting position, which highlights that the sedentary position is characterized by thoracic rotation while the pelvis remains stationary. This demonstrates that thoracic stability depends mostly on feedback from the muscle spindles, rather than from vision or the vestibular system, when the pelvis is stationary (van Drunen et al, 2016). Furthermore, in the experimental comparison of the left and right-side upper limbs, shoulders are equally able to control discrete movements which are important for performance of fine motor skills (Newell & van Emmerik, 1989).…”

Section: Introductionmentioning

confidence: 91%

A Learning Process Which Improves Symmetry in the Dynamics of Thoracic Rotation: A New Hope for the Amelioration of Motor Disabilities

Diederichs¹

2019

APE

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Intersegmental joint dynamics permit generalisability: that is, a combination of joints to achieve maximum attainable amplitude of one degree of freedom. Generalisability contains the information to configure all lesser amplitudes using many degrees. This paper describes a treatment to reduce asymmetry in thoracic rotation, which appears to cause motor disabilities and pain. It proposes a learning process to recalibrate the neuromuscular system. The treatment is based on classical conditioning in which actors receive instructions to control a specific coordinate of the dominant hand-the conditioned stimulus (CS)-to be paired with a tensile force-the unconditioned stimulus (US). This pairing of CS with US generates a sequence of events, the conditioned response (CR). To facilitate control, the hand first reaches the target position constraining the overall degrees of freedom to just one. This reduces the burden on the CNS to deal with the indeterminacy of limb lengths, the regulation of joint rotation and the combination of multiple joints for performing the motor task. The dynamics of this CR generates coupling, comparable to the dynamics described in coupling of posture and gait. To verify the theory: in Experiment 1, thirteen participants with acute motor impairment received three treatments; in Experiment 2, twenty-six healthy participants were randomly assigned into two groups to perform the experimental treatment with the dominant or the non-dominant hand, respectively, for comparison. Seven variables were measured: four ranges of motion, two perceived efforts, and one pain. In Groups 2 and 3, the improvement in thoracic symmetry was significant. The treatment is able to trigger a mechanism that detects a critical value and initiates a transition from the dynamics of the action system and task constraints to a default value. Additionally, the treatment is highlighted as a neuromodulation impacting muscle tone with long-lasting amelioration of motor disabilities and pain.

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“…A wide range of neuromuscular neck models has been presented in the literature ranging from 1-pivot models (Fard, Ishihara, & Inooka, 2003;Peng, Hain, & Peterson, 1997 to detailed multisegment models (Almeida, Fraga, Silva, & Silva-Carvalho, 2009;Brolin, Hedenstierna, Halldin, Bass, & Alem, 2008;Chancey, Nightingale, Van Ee, Knaub, & Myers, 2003;Hedenstierna, 2008;Meijer et al, 2013;Stemper, Yoganandan, & Pintar, 2004;van Ee et al, 2000;Wittek, Kajzer, & Haug, 2000;Yoganandan, Pintar, & Cusick, 2002) and partial finite element models Meyer, Bourdet, Gunzel, & Willinger, 2013;Meyer, Bourdet, Willinger, Legall, & Deck, 2004;Meyer & Willinger, 2009). To study stabilization of individual intervertebral joints, a multisegment model is needed, but we are not aware of any previous multisegment neck model to achieve stabilization in prolonged dynamic loading.…”

Section: Introductionmentioning

confidence: 99%