Axonal excitability in disorders of the peripheral and central nervous system

Peripheral axonal excitability techniques have given pathophysiological insights into many peripheral nerve disorders, with clinical application still in its infancy. Small excitability changes are usually seen compared to controls, raising questions of sensitivity. The remote effects of central lesions on peripheral excitability are not well defined. The purpose of this thesis was to correlate the changes of excitability in peripheral neuropathic disorders with their clinical signs and nerve conduction findings, and to examine for changes in peripheral nerves in a predominantly central nervous disease model. Three peripheral disorders were studied in this way for the first time. To look for a central effect on peripheral nerves, multiple sclerosis (MS) was studied, and compared with other lesional central nervous disorders. Ischaemic depolarisation was suggested in end-stage liver disease and this was not reversible one year after liver transplantation. Similar findings were noted in HIV-positive subjects but only in nucleoside drug-related neuropathy, distinguishing it from distal sensory polyneuropathy. In mitochondrial disease, motor studies showed no changes at rest or with experimental ischaemia. Sensitivity and subset comparisons indicate that in liver disease, some excitability changes correlated with peripheral clinical signs but not standard nerve conduction abnormalities. The reverse was true in mitochondrial disease. Roughly 20-25% of patients with end-stage liver neuropathy and nucleoside neuropathy were identified to fall outside control 95% confidence interval limits. Upregulated slow K+ channels seen in peripheral motor axons of MS are possibly a response to enhanced persistent inward currents (PICs) at the motoneuron following suprasegmental input interruption. In contrast, peripheral sensory studies show increased fast K+ conductance through altered gating kinetics, possibly because of humoral factors acting locally to loosen the paranodal seal

Aerospace medicine and biology: A continuing bibliography with indexes, supplement 242, February 1983

This bibliography lists 299 reports, articles and other documents introduced into the NASA scientific and technical information system in January 1983

Neurophysiology of skin thermal sensations

Undoubtedly, adjusting our thermoregulatory behavior represents the most effective mechanism to maintain thermal homeostasis and ensure survival in the diverse thermal environments that we face on this planet. Remarkably, our thermal behavior is entirely dependent on the ability to detect variations in our internal (i.e., body) and external environment, via sensing changes in skin temperature and wetness. In the past 30 years, we have seen a significant expansion of our understanding of the molecular, neuroanatomical, and neurophysiological mechanisms that allow humans to sense temperature and humidity. The discovery of temperature-activated ion channels which gate the generation of action potentials in thermosensitive neurons, along with the characterization of the spino-thalamo-cortical thermosensory pathway, and the development of neural models for the perception of skin wetness, are only some of the recent advances which have provided incredible insights on how biophysical changes in skin temperature and wetness are transduced into those neural signals which constitute the physiological substrate of skin thermal and wetness sensations. Understanding how afferent thermal inputs are integrated and how these contribute to behavioral and autonomic thermoregulatory responses under normal brain function is critical to determine how these mechanisms are disrupted in those neurological conditions, which see the concurrent presence of afferent thermosensory abnormalities and efferent thermoregulatory dysfunctions. Furthermore, advancing the knowledge on skin thermal and wetness sensations is crucial to support the development of neuroprosthetics. In light of the aforementioned text, this review will focus on the peripheral and central neurophysiological mechanisms underpinning skin thermal and wetness sensations in humans

Interrelations between the cerebral cortex and the trigeminal system: studies in healthy subjects and in migraine patients therapeutic perspectives

Understanding migraine pathophysiology is probably the most challenging point in migrainemanagement, since an efficient acute and preventive treatment should rely on clearpathophysiological bases. Migraine is characterized interictally by a lack of habituation ofevoked responses, possibly due to a decreased preactivation level of sensory cortices. Bycontrast, during an attack and in chronic migraine, the preactivation level increases andhabituation normalizes. New neurostimulation techniques could be useful to durably modifythe activation of the underlying cortex, decreasing the repetition of attacks, giving alsoinsight on the pathophysiology of migraine.The visual cortex plays a pivotal role in migraine pathophysiology, but its effect on thetrigeminal nociceptive system remains poorly understood. On the other hand migraine attackis often associated to photophobia, but the pathophysiological relation between headache andthe discomfort to the light, during the ictal but also the interictal phase, is unclear.This thesis puts a new insight into the relation between the visual cortex modulation and theresponse of the trigeminal nociceptive system, showing a possible inhibitory functionalinterrelation between these structures, via thalamic modulation.The hypothesis is based on our first finding investigating the modulation of the visual cortexby the repetitive transcranial magnetic stimulation on the nociceptive blink reflex in healthysubjects and migraine patients.This role of the activation of the visual cortex is also better understood by using the flash lightstimulation, and thanks to the conception of a new device of flash light stimulation, weperformed several protocols in healthy subjects and migraine patient with the final result aproof-of-concept trial using the flash light stimulation in migraine patients

Lycium barbarum (wolfberry) polysaccharide facilitates ejaculatory behaviour in male rats

Poster Session AOBJECTIVE: Lycium barbarum (wolfberry) is a traditional Chinese medicine, which has been considered to have therapeutic effect on male infertility. However, there is a lack of studies support the claims. We thus investigated the effect of Lycium barbarum polysaccharide (LBP), a major component of wolfberry, on male rat copulatory behavior. METHOD: Sprague-Dawley rats were divided into two groups (n=8 for each group). The first group received oral feeding of LBP at dosage of 1mg/kg daily. The control group received vehicle (0.01M phosphate-buffered saline, served as control) feeding daily for 21 days. Copulatory tests were conducted at 7, 14 and 21 days after initiation of treatment. RESULTS: Compared to control animals, animals fed with 1mg/kg LBP showed improved copulatory behavior in terms of: 1. Higher copulatory efficiency (i.e. higher frequency to show intromission rather than mounting during the test), 2. higher ejaculation frequency and 3. Shorter ejaculation latency. The differences were found at all time points (Analyzed with two-tailed student’s t-test, p<0.05). There is no significant difference found between the two groups in terms of mount/intromission latency, which indicates no difference in time required for initiation of sexual activity. Additionally, no difference in mount frequency and intromission frequency was found. CONCLUSION: The present study provides scientific evidence for the traditional use of Lycium barbarum on male sexual behavior. The result provides basis for further study of wolfberry on sexual functioning and its use as an alternative treatment in reproductive medicine.postprintThe 30th Annual Meeting of the Australian Neuroscience Society, in conjunction with the 50th Anniversary Meeting of the Australian Physiological Society (ANS/AuPS 2010), Sydney, Australia, 31 January-3 February 2010. In Abstract Book of ANS/AuPS, 2010, p. 177, abstract no. POS-TUE-19

New approaches to the study of neurorehabilitation protocols in dogs and cats with acute or chronic spinal cord injury with or without deep pain sensation and possible spinal shock signs

Tese de Doutoramento em Ciências Veterinárias na especialidade Clínica, área científica de ClínicaABSTRACT - Intensive neurorehabilitation protocols (INRP) with rehabilitation modalities and weight supported treadmill training (BWSTT), are suggested as treatment to obtain ambulation in dogs and cats with complete (DPP-), discomplete and incomplete (DPP+) compressive or non-compressive spinal cord injury (SCI), similarly to what is performed in human medicine.The first study is a cohort, prospective, controlled and blinded study that was performed in 22 dogs with T11-L3 Hansen type I, revealing ambulation in 100% of the BWSTT group, within a mean of 4.6 weeks. One other study, a retrospective controlled clinical study, was developed in 367 acute post-surgical dogs, with T10-L3 Hansen type I. A new functional neurorehabilitation scale (FNRS-DPP-) was performed to evaluate the DPP- or discomplete dogs, that were able to achieve spinal reflex locomotion (SRL). A strong significance between groups was verified in the DPP+ (p<0.001), with 99.4% of ambulation. The same difference was seen in the DPP- (p=0.007) with 58,5% of ambulation and a tendency (p=0.058) was observed in regard to DPP recovery, with 37.2% achieving SRL, within a maximum of 3 months. INRP was demonstrated to be safe and ambulation recovery achieved earlier. The same population was included in another study, on 16 dogs with incomplete recovery 3 months after surgery. DPP- were under INRP associated with 4-aminopyridine administration, achieving 78% of SRL at day 45 and automatic micturition within a mean of 62 days. Also, 100% of ambulation in the DPP+ within a mean of 47 days and positive follow-up evolution. Ambulatory status was achieved in 88%, establishing this INRP as a therapeutic option to reduce euthanasia. Non-compressive myelopathies with contusive patterns were also referred in a prospective study of 9 cats that revealed 56% (n=5) of ambulation and 44% (n=4) of SRL, showing that INRP should be considered to improve quality of life and the well-being of our patients. Some dogs may develop spinal shock following SCI, including in acute noncompressive nucleus pulposus extrusion. Thus, a cohort prospective study applied a spinal shock scale as a monitoring tool, suggesting spinal shock as a negative factor for a quick recovery. INRP was shown to be safe, tolerable and feasible, allowing 32% of ambulation within 7 days and 94% within 60 days. Follow-ups until 4 years revealed a positive evolution. These studies should be continued, considering each limitationRESUMO - Nova abordagem aos protocolos de neuroreabilitação em cães e gatos com lesão medular aguda ou crónica, com/sem sensibilidade à dor profunda e choque espinhal. - Os protocolos de neuroreabilitação intensiva (INRP), com as modalidades de reabilitação e o treino locomotor em tapete rolante com suporte de peso (BWSTT), são sugeridos como terapêutica para obter a ambulação em cães e gatos de lesão medular compressiva / não compressiva, completa (DPP-), “discompleta” e incompleta (DPP+), tal como na medicina humana. Assim, apresenta-se o primeiro artigo, estudo de coorte, prospetivo, controlado e cego, em 22 cães com lesão T11-L3 Hansen tipo I, que demonstrou 100% de ambulação no grupo BWSTT, em média de 4.6 semanas. O segundo artigo refere-se ao estudo controlado e retrospetivo de 367 cães pós-cirúrgicos com lesão aguda T10-L3 de Hansen tipo I. A escala de neuroreabilitação funcional (FNRS-DPP-) foi elaborada e aplicada nestes cães, DPP- ou incompletos, capazes de atingir a locomoção espinhal por reflexos (SRL). Verificaram-se diferenças significativas entre grupos, nos DPP+ (p<0,001) com 99,4% de ambulação, e nos DPP- (p=0,007) com 58,5%. Em relação à recuperação da sensibilidade profunda (p=0,058), ocorreu 37.3% de SRL, no máximo em 3 meses. O INRP demonstrou-se seguro e a recuperação foi atingida de forma mais precoce. O mesmo foi estudado em 16 cães com recuperação incompleta 3 meses após cirurgia, sendo associada a administração de 4- aminopiridina nos DPP- com 78% de SRL até 45 dias e micção automática em ~62 dias. Obteve-se 100% de ambulação nos cães DPP+, em ~47 dias, com evolução positiva nas consultas de seguimento. A ambulação total foi de 88%, estabelecendo este INRP como opção terapêutica, reduzindo o número de eutanásias em âmbito clínico. As mielopatias não compressivas foram, também, estudadas. Assim sendo, estudo propectivo em 9 gatos revelou 56% de ambulação e 44% de SRL, demostrando que o INRP poderá ser considerado, no sentido de melhorar a qualidade de vida e bem-estar destes doentes. Após a lesão medular, alguns cães podem desenvolver o choque espinhal, principalmente na extrusão aguda não compressiva do núcleo pulposo. Assim, foi desenvolvido estudo propectivo coorte que elaborou e aplicou escala de choque espinhal para monitorização, sugerindo o choque espinhal como fator negativo para a rápida recuperação. Este INRP revelou-se seguro, tolerável e viável, com 32% de ambulação em 7 dias e 94% em 60 dias. Consultas de seguimento até 4 anos revelaram evolução positiva. Estes estudos devem ser continuados considerando as suas limitações.N/

A first step toward cognitive remediation of voices: a case study.

Several studies have shown that source-monitoring errors are related to verbal hallucinations in schizophrenia. An exploratory pilot study has been carried out to investigate the possibility of training patients in how to avoid errors in source-monitoring. One patient with paranoid schizophrenia and persistent thought insertions was trained for 6 hours to use mnemonic techniques to compensate specific deficits in source-monitoring. Results show that the patient was able to improve his performance and maintain the acquired progress at a 1-month follow-up assessment. These preliminary results are interesting for developing a larger controlled study of cognitive remediation of source-monitoring deficits

The relationship between perception of effort and physiological responses to an acute fatiguing task of the elbow flexors. Evaluation of a new rating scale of perception of effort

This thesis was submitted for the degree of Doctor of Philosophy and awarded by Brunel University.While fatigue is a common daily phenomenon, the exact relationship between perception of effort and fatigue is still unknown. Existing tools for assessing perception of effort are effectively limited to whole body exercise, while current methods for assessing voluntary activation are painful and not feasible for clinical application. The main aims of this thesis were to evaluate existing methodologies for their appropriateness in assessing perception of effort and voluntary activation following isolated muscle function testing, and to examine the relationship between subjective perception of effort and objective changes in the healthy motor control system. The implementation of reliable and valid assessment tools in clinical practice may enable clarification of the pathogenesis of many neurological conditions that have chronic fatigue as a key feature. Four studies of within-subjects repeated measures design have been conducted. Sixtynine healthy volunteers were recruited among staff and students of Brunel University. Magnetic stimulation was tested as a valid alternative to electrical stimulation in the conventional single-pulse Twitch Interpolation Technique. The 0–10 Numeric Rating Scale (NRS) was also tested for its reliability and validity in assessing the perception of effort during isometric exercise of elbow flexors. The changes of perception of effort following a submaximal elbow flexion fatiguing task, as well as following transcranial direct current stimulation (tDCS) over the motor cortex were also tested. The main findings showed significant differences between peripheral and magnetic stimulation in conventional single-pulse Twitch Interpolation Technique. The 0–10 NRS demonstrated linear properties and reported excellent test-retest reliability and good concurrent criterion validity in recording perception of effort under repeated isometric contractions of elbow flexors. Ten minutes of a submaximal intermittent isometric fatiguing exercise produced a significant elevation in rating of perceived effort, which was associated with central and peripheral neurophysiological changes of the motor control system. In contrast, perception of effort did not change significantly following 10 minutes of tDCS. The major findings of this thesis suggest the 0–10 NRS is a valid and reliable scale for rating perception of effort in healthy individuals. Further testing of the scale on patients is needed to establish its validity in clinical settings. Additionally, the findings indicate a substantial role of perception of effort in the voluntary motor control system. However, further research towards revealing the underlying mechanisms of perceived effort regulation in both health and disease is required

Advances in Clinical Neurophysiology

Including some of the newest advances in the field of neurophysiology, this book can be considered as one of the treasures that interested scientists would like to collect. It discusses many disciplines of clinical neurophysiology that are, currently, crucial in the practice as they explain methods and findings of techniques that help to improve diagnosis and to ensure better treatment. While trying to rely on evidence-based facts, this book presents some new ideas to be applied and tested in the clinical practice. Advances in Clinical Neurophysiology is important not only for the neurophysiologists but also for clinicians interested or working in wide range of specialties such as neurology, neurosurgery, intensive care units, pediatrics and so on. Generally, this book is written and designed to all those involved in, interpreting or requesting neurophysiologic tests

Aerospace medicine and biology: A cumulative index to the continuing bibliography of the 1973 issues

A cumulative index to the abstracts contained in Supplements 112 through 123 of Aerospace Medicine and Biology A Continuing Bibliography is presented. It includes three indexes: subject, personal author, and corporate source