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https://www.readbyqxmd.com/read/28628390/influence-of-screw-surface-treatment-on-retention-of-implant-supported-fixed-partial-dentures
#1
Marcos Boaventura de Moura, Renata Borges Rodrigues, Leandro Moreira Pinto, Cleudmar Amaral de Araújo, Veridiana Resende Novais, Paulo César Simamoto Júnior
The aim of this study was to assess the effect of DLC (Diamond-like carbon) coating on the removal torque of prefabricated implant screws after cyclic loading. Four groups with two crowns supported by two implants (n=5) were obtained according to splinted and non-splinted prosthesis, using titanium or DLC screw (STi, SC, NSTi and NSC). The prosthetic screws were tightened at 32Ncm, retightened, and the specimens were submitted to 106 mechanical cycles (4Hz/98N). After cyclic loading, loosening torque was evaluated and the final measurements were performed...
June 19, 2017: Journal of Oral Implantology
https://www.readbyqxmd.com/read/28577906/dynamic-head-neck-stabilization-and-modulation-with-perturbation-bandwidth-investigated-using-a-multisegment-neuromuscular-model
#2
Riender Happee, Edo de Bruijn, Patrick A Forbes, Frans C T van der Helm
The human head-neck system requires continuous stabilization in the presence of gravity and trunk motion. We investigated contributions of the vestibulocollic reflex (VCR), the cervicocollic reflex (CCR), and neck muscle co-contraction to head-in-space and head-on-trunk stabilization, and investigated modulation of the stabilization strategy with the frequency content of trunk perturbations and the presence of visual feedback. We developed a multisegment cervical spine model where reflex gains (VCR and CCR) and neck muscle co-contraction were estimated by fitting the model to the response of young healthy subjects, seated and exposed to anterior-posterior trunk motion, with frequency content from 0...
May 17, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28562524/the-work-rate-of-elite-hurling-match-play
#3
Kieran Collins, Allistair McRobert, James P Morton, Declan O' Sullivan, Dominic A Doran
The current study describes the global work-rate of elite hurling match-play and the influence which positional difference has on work-rate is considered. The movement of ninety-four players was recorded using GPS, sampling at 4Hz in a total of 12 games. Data were classified according to the positional line on the field and period of the match. The total and high speed distance of match-play was 7617 ± 1219 m (95% CI, 7367 - 7866) and 1134 ± 358 m (95% CI, 1060 - 1206) respectively. The maximum speed attained was 29...
January 27, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28527912/implicit-variations-of-temporal-predictability-shaping-the-neural-oscillatory-and-behavioural-response
#4
Sophie K Herbst, Jonas Obleser
Being able to predict when an event will occur (temporal predictability) can help us prepare and time our responses. We here sought to delineate the neural and behavioural corollaries of highly implicit, probabilistic temporal predictability in an auditory foreperiod paradigm. To this end, we measured electroencephalography (EEG) and response times in two independent experiments (total N =46). Unbeknownst to participants, we induced a probabilistic variation of cue-target delays (i.e., foreperiods) in a pitch-discrimination task on a noise-embedded tone: The smaller the standard deviation of the underlying foreperiod distribution, the more predictable the time of target occurrence should be...
May 17, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/28460716/does-electrode-placement-influence-tens-induced-antihyperalgesia-in-experimental-inflammatory-pain-model
#5
Maurício L Poderoso Neto, Leonardo Y S Maciel, Kamilla M L Cruz, Valter J Santana Filho, Leonardo R Bonjardim, Josimari M DeSantana
BACKGROUND: Transcutaneous electrical nerve stimulation (TENS) is a treatment commonly used for managing pain; however, the ideal placement of the electrodes is not fully understood. OBJECTIVE: To investigate the best way to apply TENS electrodes in an experimental inflammatory pain model. METHOD: Knee joint inflammation was induced in rats, followed by administration of low-frequency TENS (4Hz) under anesthesia for five days. Animals were randomly allocated to five groups according to electrode placement (n=6, each): dermatome, contralateral, paraspinal, acupoint, and control...
March 2017: Brazilian Journal of Physical Therapy
https://www.readbyqxmd.com/read/28412532/spectral-analysis-highlight-developmental-eeg-changes-in-preterm-infants-without-overt-brain-damage
#6
Agnese Suppiej, Elisa Cainelli, Ambra Cappellari, Daniele Trevisanuto, Laura Balao, Maria Grazia Di Bono, Patrizia S Bisiacchi
Early markers of neurological outcome in the absence of overt brain damage are scarce in extreme prematurity. The aim of this study was to compare spectral EEG values of infants born near term with those of infants born at extremely low gestational age (ELGA) but having attained near term age. We aimed also to evaluate whether spectral EEG features were related with neurological outcome. The ELGA group consisted of 12 neonates born between 23+2 and 27+6 weeks; the control group consisted of nine infants born 34-35+2 weeks, tested within the first week of life...
April 13, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28315757/chronic-social-stress-leads-to-altered-sleep-homeostasis-in-mice
#7
Nadja Olini, Iru Rothfuchs, Damiano Azzinnari, Christopher R Pryce, Salome Kurth, Reto Huber
Disturbed sleep and altered sleep homeostasis are core features of many psychiatric disorders such as depression. Chronic uncontrollable stress is considered an important factor in the development of depression, but little is known on how chronic stress affects sleep regulation and sleep homeostasis. We therefore examined the effects of chronic social stress (CSS) on sleep regulation in mice. Adult male C57BL/6 mice were implanted for electrocortical recordings (ECoG) and underwent either a 10-day CSS protocol or control handling (CON)...
June 1, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28315696/auditory-deficits-in-amusia-extend-beyond-poor-pitch-perception
#8
Kelly L Whiteford, Andrew J Oxenham
Congenital amusia is a music perception disorder believed to reflect a deficit in fine-grained pitch perception and/or short-term or working memory for pitch. Because most measures of pitch perception include memory and segmentation components, it has been difficult to determine the true extent of pitch processing deficits in amusia. It is also unclear whether pitch deficits persist at frequencies beyond the range of musical pitch. To address these questions, experiments were conducted with amusics and matched controls, manipulating both the stimuli and the task demands...
May 2017: Neuropsychologia
https://www.readbyqxmd.com/read/28288909/oscillatory-eeg-dynamics-underlying-automatic-chunking-during-sentence-processing
#9
Corinna E Bonhage, Lars Meyer, Thomas Gruber, Angela D Friederici, Jutta L Mueller
Sentences are easier to remember than random word sequences, likely because linguistic regularities facilitate chunking of words into meaningful groups. The present electroencephalography study investigated the neural oscillations modulated by this so-called sentence superiority effect during the encoding and maintenance of sentence fragments versus word lists. We hypothesized a chunking-related modulation of neural processing during the encoding and retention of sentences (i.e., sentence fragments) as compared to word lists...
March 10, 2017: NeuroImage
https://www.readbyqxmd.com/read/28238903/responsiveness-to-bronchodilator-procaterol-in-copd-as-assessed-by-forced-oscillation-technique
#10
Satoru Ito, Akemi Uchida, Yoshitaka Isobe, Yoshinori Hasegawa
The aim of this retrospective study was to assess responses to a bronchodilator by forced oscillation technique (FOT) and to relate the results of respiratory impedance (Zrs) to spirometric parameters in patients with chronic obstructive pulmonary disease (COPD). Zrs was measured as a function of frequency from 4 to 36Hz before and after inhalation of procaterol, a short-acting β2-agonist (n=60). Respiratory resistance (Rrs) and reactance (Xrs) were significantly frequency-dependent, and inspiratory and expiratory phases were different both before and after procaterol inhalation...
June 2017: Respiratory Physiology & Neurobiology
https://www.readbyqxmd.com/read/28238859/automated-selective-disruption-of-slow-wave-sleep
#11
Sharon J Ooms, John M Zempel, David M Holtzman, Yo-El S Ju
BACKGROUND: Slow wave sleep (SWS) plays an important role in neurophysiologic restoration. Experimentally testing the effect of SWS disruption previously required highly time-intensive and subjective methods. Our goal was to develop an automated and objective protocol to reduce SWS without affecting sleep architecture. NEW METHOD: We developed a custom Matlab™ protocol to calculate electroencephalogram spectral power every 10s live during a polysomnogram, exclude artifact, and, if measurements met criteria for SWS, deliver increasingly louder tones through earphones...
April 1, 2017: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/28237801/inactivation-of-the-medial-mammillary-nucleus-attenuates-theta-rhythm-activity-in-the-hippocampus-in-urethane-anesthetized-rats
#12
Witold Żakowski, Łukasz Braszka, Piotr Zawistowski, Jolanta Orzeł-Gryglewska, Edyta Jurkowlaniec
Although the importance of the mammillary body for memory and learning processes is well known, its exact role has remained vague. The fact, that many neurons in one nucleus of the mammillary body in rats, i.e. the medial mammillary nucleus (MM), fires according with hippocampal theta rhythm, makes this structure crucial for a theta rhythm signaling in so-called extended hippocampal system. These neurons are driven by descending projections from the hippocampal formation, but it is still unknown whether the mammillary body only conveys theta rhythm or may also modulate it...
February 22, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28228241/neuropeptide-s-reduces-propofol-or-ketamine-induced-slow-wave-states-through-activation-of-cognate-receptors-in-the-rat
#13
Xiang-Pan Kong, Can Wang, Jun-Fan Xie, Peng Zhao, Li-Rong Dai, Yu-Feng Shao, Jian-Sheng Lin, Yi-Ping Hou
Intracerebroventricular injection of NPS reduces the duration of the ketamine- or thiopental-induced loss of the righting reflex in rats. But the specific EEG activities are unknown. We therefore sought to examine the effects of the NPS-NPSR system on anesthetic-induced characteristics of EEG power spectra and sleep-wake profiles. NPS alone or together with an NPSR antagonist was injected intracerebroventricularly, whereas the propofol (50mg/kg) or ketamine (100mg/kg) was administrated intraperitoneally. NPS (1 or 2nmol) significantly reduced the amount of propofol-induced EEG delta activity and slow wave states (SWS)...
February 14, 2017: Neuropeptides
https://www.readbyqxmd.com/read/28219848/bioelectronic-neuromodulation-of-the-paravertebral-cardiac-efferent-sympathetic-outflow-and-its-effect-on-ventricular-electrical-indices
#14
Una Buckley, Ray W Chui, Pradeep S Rajendran, Tina Vrabec, Kalyanam Shivkumar, Jeffrey L Ardell
BACKGROUND: Neuromodulation of the paravertebral ganglia by using symmetric voltage controlled kilohertz frequency alternating current (KHFAC) has the potential to be a reversible alternative to surgical intervention in patients with refractory ventricular arrhythmias. KHFAC creates scalable focal inhibition of action potential conduction. OBJECTIVE: The purpose of this article was to evaluate the efficacy of KHFAC when applied to the T1-T2 paravertebral chain to mitigate sympathetic outflow to the heart...
July 2017: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/28103469/transitions-of-postural-coordination-as-a-function-of-frequency-of-the-moving-support-platform
#15
Aviroop Dutt-Mazumder, Karl Newell
This study was set-up to investigate the multi-segmental organization of human postural control in a dynamic balance task. The focus was on the coupling between the center of mass (CoM) and center of pressure (CoP) as a candidate collective variable that supports maintaining balance on a sinusoidal oscillating platform in the medial-lateral (ML) plane and was continuously scaled up and then down across a frequency range from 0.2Hz to 1.2Hz. The CoM-CoP coordination changed from in-phase to anti-phase and anti-phase to in-phase at a critical frequency (∼0...
April 2017: Human Movement Science
https://www.readbyqxmd.com/read/28065673/spectral-analysis-of-reflex-cutaneous-vasodilatation-during-passive-heat-stress
#16
Matthew M Mallette, Gary J Hodges, Gregory W McGarr, David A Gabriel, Stephen S Cheung
Previous work has demonstrated that spectral analysis is a useful tool to non-invasively ascertain the mechanisms of control of the cutaneous circulation. The majority of work using spectral analysis has focused on local control mechanisms, with none examining reflex control. Skin blood flow was analysed using spectral analysis on the dorsal aspect of the forearm of 7 males and 7 females during passive heat stress, with mean forearm and local temperature at the site of measurement maintained at thermoneutral (33°C) to minimize the effect of local control mechanisms...
May 2017: Microvascular Research
https://www.readbyqxmd.com/read/28042996/individual-difference-in-%C3%AE-band-corticomuscular-coherence-and-its-relation-to-force-steadiness-during-isometric-voluntary-ankle-dorsiflexion-in-healthy-humans
#17
Junichi Ushiyama, Junya Yamada, Meigen Liu, Junichi Ushiba
OBJECTIVE: Magnitude of β-band coherent neural activities between the sensorimotor cortex and contracting muscle is known to vary across healthy individuals. To clarify how this variance affects actual motor function, this study examined associations between the corticomuscular coherence (CMC) and force steadiness. METHODS: CMC was calculated between scalp electroencephalograms (EEGs) over the sensorimotor cortex and surface electromyograms (EMGs) from the tibialis anterior muscle during tonic isometric voluntary ankle dorsiflexion at 30% of maximal effort in 22 healthy individuals...
February 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28033533/fatigue-responses-of-the-human-cervical-spine-intervertebral-discs
#18
Narayan Yoganandan, Sagar Umale, Brain Stemper, Bryan Snyder
Numerous studies have been conducted since more than fifty years to understand the behavior of the human lumbar spine under fatigue loading. Applications have been largely driven by low back pain and human body vibration problems. The human neck also sustains fatigue loading in certain type of civilian occupational and military operational activities, and research is very limited in this area. Being a visco-elastic structure, it is important to determine the stress-relaxation properties of the human cervical spine intervertebral discs to enable accurate simulations of these structures in stress-analysis models...
May 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28029427/predicting-tdcs-treatment-outcomes-of-patients-with-major-depressive-disorder-using-automated-eeg-classification
#19
Alaa M Al-Kaysi, Ahmed Al-Ani, Colleen K Loo, Tamara Y Powell, Donel M Martin, Michael Breakspear, Tjeerd W Boonstra
BACKGROUND: Transcranial direct current stimulation (tDCS) is a promising treatment for major depressive disorder (MDD). Standard tDCS treatment involves numerous sessions running over a few weeks. However, not all participants respond to this type of treatment. This study aims to investigate the feasibility of identifying MDD patients that respond to tDCS treatment based on resting-state electroencephalography (EEG) recorded prior to treatment commencing. METHODS: We used machine learning to predict improvement in mood and cognition during tDCS treatment from baseline EEG power spectra...
January 15, 2017: Journal of Affective Disorders
https://www.readbyqxmd.com/read/28000230/mitochondrial-capacity-muscle-endurance-and-low-energy-in-friedreich-ataxia
#20
Hannah M Bossie, T Bradley Willingham, Robbi A Van Schoick, Patrick J O'Connor, Kevin K McCully
INTRODUCTION: In this study we noninvasively evaluated skeletal muscle mitochondrial capacity, muscle-specific endurance, and energy/fatigue feelings in persons with Friedreich ataxia (FRDA) and able-bodied controls (AB). METHODS: Forearm mitochondrial capacity was measured in FRDA (n = 16) and AB (n = 10) study participants using the rate of recovery of oxygen consumption after electrical stimulation with near-infrared spectroscopy. Mechanomyography (MMG) assessed muscle endurance after electrical stimulation for 3 minutes at 2 Hz, 4 Hz, and 6 Hz...
December 21, 2016: Muscle & Nerve
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