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Postural reflexes

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https://www.readbyqxmd.com/read/28515977/establishing-normative-change-values-in-visual-acuity-loss-during-the-dynamic-visual-acuity-test
#1
Chris Marquez, Monica Lininger, Scot Raab
BACKGROUND: Baseline visual acuity (VA) loss from static to dynamic head conditions assessed using the Dynamic Visual Acuity Testing (DVAT) have not been established in NCAA football players. DVAT assesses the Vestibulo-Ocular Reflex (VOR) which is measured in Logarithm of the Minimum Angle of Resolution (logMAR). Decreased VA beyond baseline measures may detect VOR impairment and impact treatment protocols and assist in return to play decisions post-concussion. HYPOTHESIS/PURPOSE: To establish normative VA mean scores during a static head posture as well as dynamically during the DVAT with a head speed of 150 deg/s in the pitch (vertical) and yaw (horizontal) planes rotating 20 degrees in each direction...
April 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28495941/pontomesencephalic-atrophy-and-postural-instability-in-wilson-disease
#2
J Kalita, S Naik, S K Bhoi, U K Misra, A Ranjan, S Kumar
BACKGROUND AND PURPOSE: The MR Parkinsonism index helps in differentiating progressive supranuclear palsy from Parkinson disease and multisystem atrophy. Pontomesencephalic involvement is common in neurologic Wilson disease, but there is no prior study evaluating the MR Parkinsonism index and its indices in Wilson disease. We report the MR Parkinsonism index and its indices in Wilson disease and correlate these changes with clinical severity and postural reflex. MATERIALS AND METHODS: Thirteen individuals with neurologic Wilson disease were included, and their clinical details, including neurologic severity, postural reflex abnormality, and location of signal changes on MR imaging, were noted...
May 11, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/28462674/validity-and-reliability-of-smartphone-applications-for-clinical-assessment-of-the-neuromusculoskeletal-system
#3
Aliaa Rehan Youssef, Mohammed Gumaa
Clinicians increasingly use smartphone medical applications. There is no evidence to support the validity and reliability of applications used to assess the neuromusculoskeletal system. The aim of this study is to systematically review the quality of studies as well as the validity and reliability of using a smartphone as a clinical assessment tool for the neuromusculoskeletal system. Areas covered: PubMed, CINAHL and Embase were searched. A manual search was also conducted. Additionally, forward snowballing of relevant articles was performed in Scopus and Web of Science...
May 2, 2017: Expert Review of Medical Devices
https://www.readbyqxmd.com/read/28459026/cardiac-autonomic-neuropathy-in-patients-with-type-2-diabetes-mellitus-at-high-risk-for-foot-ulcers
#4
Anil S Menon, Abhinav Dixit, M K Garg, R Girish
AIM: To study the prevalence of cardiac autonomic neuropathy (CAN) in patients with Type 2 diabetes mellitus at high risk for foot ulcers. MATERIALS AND METHODS: We screened patients attending diabetic clinic for identifying patients at high risk for foot ulcers. Those with foot risk category 1, 2 and 3 as per criteria of Foot Care Interest Group were subjected to battery of cardiovascular autonomic reflex tests. Those with one abnormal test were termed as probable CAN and those with two abnormal tests as definite CAN...
March 2017: Indian Journal of Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28455739/postural-responses-in-the-upper-limbs-evoked-by-axial-impulses-a-role-for-reticulospinal-projections
#5
Baozhing Teng, Sendhil Govender, James G Colebatch
We studied the short-latency (SL) postural effects of axial impulses in 11 subjects (22 ± 2 years old). Recordings were made bilaterally from soleus and tibialis anterior (TA) muscles. We confirmed that with leaning anteriorly and posteriorly, reflex EMG increases occurred in both muscle groups at short latency following brief perturbations applied over C7 or the sternum (soleus mean latencies 57.5 and 66.4 ms; TA mean 51.7 and 55.4 ms, respectively). While the size of the SL reflexes was affected by the direction of lean when standing we found that light touch did not affect the amplitudes or latencies significantly...
April 28, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28451451/abnormal-haemodynamic-postural-response-in-patients-with-chronic-heart-failure
#6
Anne-Sophie G T Bronzwaer, Lysander W J Bogert, Berend E Westerhof, Jan J Piek, Mat J A P Daemen, Johannes J van Lieshout
AIM: The objective was to evaluate in treated heart failure (HF) patients whether multidrug therapy interferes with the cardiovascular autonomic response to postural stress. METHODS AND RESULTS: Blood pressure (BP; Finapres), heart rate (HR), stroke volume, and total peripheral resistance (TPR) responses to standing up were measured in 33 HF patients and 10 healthy age-matched controls. Ten hypertensive (HT) patients treated with a similar combination of drugs but without heart failure served as reference subjects to account for use of medication...
May 2017: ESC Heart Failure
https://www.readbyqxmd.com/read/28436247/effects-of-peripheral-vestibular-dysfunction-on-dynamic-postural-stability-measured-by-the-functional-reach-test-and-timed-up-and-go-test
#7
Toshiko Nishi, Teru Kamogashira, Chisato Fujimoto, Makoto Kinoshita, Naoya Egami, Keiko Sugasawa, Tatsuya Yamasoba, Shinichi Iwasaki
OBJECTIVE: To investigate the influence of vestibular function on dynamic postural stability assessed by the functional reach test (FRT) and the timed up and go test (TUG). STUDY DESIGN: Retrospective study. SETTING: Tertiary referral center. SUBJECTS AND METHODS: The FRT and TUG were performed in 399 patients with dizziness. The effects of peripheral vestibular dysfunction assessed by the caloric test and cervical vestibular evoked myogenic potentials (cVEMPs) to air-conducted sound (500 Hz, tone burst) on the results of FRT and TUG were analyzed...
June 2017: Annals of Otology, Rhinology, and Laryngology
https://www.readbyqxmd.com/read/28434057/predictive-control-of-intersegmental-tarsal-movements-in-an-insect
#8
Alicia Costalago-Meruelo, David M Simpson, Sandor M Veres, Philip L Newland
In many animals intersegmental reflexes are important for postural and movement control but are still poorly undesrtood. Mathematical methods can be used to model the responses to stimulation, and thus go beyond a simple description of responses to specific inputs. Here we analyse an intersegmental reflex of the foot (tarsus) of the locust hind leg, which raises the tarsus when the tibia is flexed and depresses it when the tibia is extended. A novel method is described to measure and quantify the intersegmental responses of the tarsus to a stimulus to the femoro-tibial chordotonal organ...
April 22, 2017: Journal of Computational Neuroscience
https://www.readbyqxmd.com/read/28424576/defensive-vocalizations-and-motor-asymmetry-triggered-by-disinhibition-of-the-periaqueductal-gray-in-non-human-primates
#9
Patrick A Forcelli, Hannah F Waguespack, Ludise Malkova
Rapid and reflexive responses to threats are present across phylogeny. The neural circuitry mediating reflexive defense reactions has been well-characterized in a variety of species, for example, in rodents and cats, the detection of and species-typical response to threats is mediated by a network of structures including the midbrain tectum (deep and intermediate layers of the superior colliculus [DLSC]), periaqueductal gray (PAG), and forebrain structures such as the amygdala and hypothalamus. However, relatively little is known about the functional architecture of defense circuitry in primates...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28409395/spinal-and-corticospinal-pathways-are-differently-modulated-when-standing-at-the-bottom-and-the-top-of-a-three-step-staircase-in-young-and-older-adults
#10
Johanna Johannsson, Jacques Duchateau, Stéphane Baudry
PURPOSE: This study investigated the modulation of spinal (group Ia afferents) and corticospinal pathways when young (22.7 ± 1.3 years) and older adults (72.2 ± 7.9 years) stood at the bottom and at the top of a three-step staircase equipped with force platforms. METHOD: Changes in submaximal H-reflex amplitude (H 50) and slope of the H-reflex input-output relation (spinal pathway), and in amplitude of motor-evoked potentials (MEP) triggered by transcranial magnetic stimulation (corticospinal pathway) at two intensities (1...
April 13, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28396651/descending-influences-on-vestibulospinal-and-vestibulosympathetic-reflexes
#11
REVIEW
Andrew A McCall, Derek M Miller, Bill J Yates
This review considers the integration of vestibular and other signals by the central nervous system pathways that participate in balance control and blood pressure regulation, with an emphasis on how this integration may modify posture-related responses in accordance with behavioral context. Two pathways convey vestibular signals to limb motoneurons: the lateral vestibulospinal tract and reticulospinal projections. Both pathways receive direct inputs from the cerebral cortex and cerebellum, and also integrate vestibular, spinal, and other inputs...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28393118/postural-compensation-strategy-depends-on-the-severity-of-vestibular-damage
#12
Lara A Thompson, Csilla Haburcakova, Richard F Lewis
The purpose of this study was to investigate the effects of various levels of vestibular function on balance in two, free-standing rhesus monkeys. We hypothesized that postural control strategy depended on the severity of vestibular damage. More specifically, that increased muscle stiffness (via short-latency mechanisms) was adequate to compensate for mild damage, but long-latency mechanisms must be utilized for more severe vestibular damage. One animal was studied for pre-ablated and mild vestibular dysfunction states, while a second animal was studied in a pre-ablated and severe vestibular dysfunction state...
March 2017: Heliyon
https://www.readbyqxmd.com/read/28387690/the-vestibular-implant-a-probe-in-orbit-around-the-human-balance-system
#13
Angelica Perez Fornos, Samuel Cavuscens, Maurizio Ranieri, Raymond van de Berg, Robert Stokroos, Herman Kingma, Jean-Philippe Guyot, Nils Guinand
The primary goal of the vestibular implant is to restore the vestibular function in patients with a disabling bilateral vestibular loss for whom there is currently no available treatment. The prototype developed by our team is a hybrid system consisting of a modified cochlear implant incorporating additional vestibular electrodes. Therefore, in addition of delivering sound information it is also capable of delivering motion information to the central nervous system using electrical stimulation. To date, thirteen patients have been implanted with such vestibular implant prototypes...
2017: Journal of Vestibular Research: Equilibrium & Orientation
https://www.readbyqxmd.com/read/28376642/cardiovascular-sequel-of-neck-irradiation-in-head-and-neck-cancer-patients
#14
Manish Goyal, Pragya Shukla, Deepak Gupta, Shyam Bisht, Nar Singh Verma, Sunita Tiwari, Madan Lal Bhatt
PURPOSE: Introduction: The baroreflex is an important afferent mechanism controlling autonomic functions. As afferent nerves course through the neck, they are susceptible to damage by neck irradiation in the head and neck cancer patients. With increased survival of head and neck cancer patients because of improved therapy, the cardiovascular morbidity and mortality in them have become apparent and is of clinical concern. There are few case reports of baroreflex failure as a chronic sequel to neck irradiation...
April 5, 2017: International Journal of Radiation Biology
https://www.readbyqxmd.com/read/28374114/vibration-related-extrusion-of-capillary-blood-from-the-calf-musculature-depends-upon-directions-of-vibration-of-the-leg-and-of-the-gravity-vector
#15
Halil Ibrahim Çakar, Serfiraz Doğan, Sadık Kara, Jörn Rittweger, Rainer Rawer, Jochen Zange
PURPOSE: In this study, we investigated the effects of vibration of the whole lower leg on the content and the oxygenation of hemoglobin in the unloaded relaxed lateral gastrocnemius muscle. Vibration was applied orthogonal to and in parallel with leg axis to examine whether the extrusion of blood depends on an alignment of main vessel direction, axis of vibration and gravity. METHOD: The blood volume in the muscles was altered by horizontal and 30° upright body posture...
April 3, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28368883/effect-of-gaze-stabilization-exercises-on-vestibular-function-during-postural-control
#16
Akiyoshi Matsugi, Yusuke Ueta, Kosuke Oku, Kojiro Okuno, Yoshiki Tamaru, Shohei Nomura, Hiroaki Tanaka, Nobuhiko Mori
Gaze-stabilization exercise (GSE) is often conducted in vestibular rehabilitation, but its effect on vestibular function in postural control is not clear. We investigated whether GSE affects vestibular function during static upright standing and vestibulospinal reflex (VSR) in healthy young adults. First, the center of pressure of the total trajectory length (CoP-L) was measured before each GSE task or control (only standing) task (pre), immediately after (post), and 10 min after (post10) in the static standing position on foam rubber with the eyes open or closed (EC)...
May 24, 2017: Neuroreport
https://www.readbyqxmd.com/read/28348547/altered-cervical-vestibular-evoked-myogenic-potential-in-children-with-attention-deficit-and-hyperactivity-disorder
#17
Valeria Isaac, Diego Olmedo, Francisco Aboitiz, Paul H Delano
OBJECTIVE: Emerging evidence suggests that children with attention deficit and hyperactivity disorder (ADHD) present more difficulties in standing and walking balance than typically developing children. Most of previous studies have assessed these functions using postural and sensory organization tests showing differences in balance performance between control and ADHD children. However, to date, it is unknown whether these balance alterations are accompanied with vestibular dysfunction...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28344549/functional-brain-activation-in-response-to-a-clinical-vestibular-test-correlates-with-balance
#18
Fatemeh Noohi, Catherine Kinnaird, Yiri DeDios, Igor S Kofman, Scott Wood, Jacob Bloomberg, Ajitkumar Mulavara, Rachael Seidler
The current study characterizes brain fMRI activation in response to two modes of vestibular stimulation: Skull tap and auditory tone burst. The auditory tone burst has been used in previous studies to elicit either a vestibulo-spinal reflex [saccular-mediated colic Vestibular Evoked Myogenic Potentials (cVEMP)], or an ocular muscle response [utricle-mediated ocular VEMP (oVEMP)]. Research suggests that the skull tap elicits both saccular and utricle-mediated VEMPs, while being faster and less irritating for subjects than the high decibel tones required to elicit VEMPs...
2017: Frontiers in Systems Neuroscience
https://www.readbyqxmd.com/read/28339131/tissue-deformation-index-as-a-reliable-measure-of-lateral-abdominal-muscle-activation-on-m-mode-sonography
#19
Maciej Biały, Wacław Adamczyk, Rafael Gnat, Tomasz Stranc
The aim of this article is to present a novel method of evaluating the activity of lateral abdominal muscles using M-mode sonography. The method leads to calculation of the tissue deformation index, representing the percent change in lateral abdominal muscle thickness over time. The objectives of this study were as follows: (1) to establish the mean tissue deformation index values for individual lateral abdominal muscles; and (2) to establish the reliability of the tissue deformation index. In a group of 34 healthy young volunteers (mean age, 24...
March 24, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/28332011/delayed-otolith-development-does-not-impair-vestibular-circuit-formation-in-zebrafish
#20
Richard Roberts, Jeffrey Elsner, Martha W Bagnall
What is the role of normally patterned sensory signaling in development of vestibular circuits? For technical reasons, including the difficulty in depriving animals of vestibular inputs, this has been a challenging question to address. Here we take advantage of a vestibular-deficient zebrafish mutant, rock solo (AN66) , in order to examine whether normal sensory input is required for formation of vestibular-driven postural circuitry. We show that the rock solo (AN66) mutant is a splice site mutation in the secreted glycoprotein otogelin (otog), which we confirm through both whole genome sequencing and complementation with an otog early termination mutant...
June 2017: Journal of the Association for Research in Otolaryngology: JARO
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