Search results for "reflex"
showing 10 items of 622 documents
Field notes: ethnographic writing reconsidered
2013
Even after the so-called ‘crisis of representation’ in ethnographic research the representation of cultural practices constitutes the focal point of ethnographic research practices. Although ethnographic representations are now conceived of as realizations of (other) cultural practices, from a methodological point of view little has been said about the devices with which ethnographic representation is performed. This paper discusses two of the aspects constituting ethnographic research: firstly, the switch between the perspectives of documentarism of the ethnographic data, and a reflexive understanding of this data, and, secondly, the implications of representation devices used in ethnograp…
Child-researcher relationships in child protection research : an integrative review
2021
In research with children, particularly those in contact with social and health services, researchers face ethical challenges and have stringent ethical obligations. One obligation regards the need for researchers to adopt a reflexive approach to considering how children’s perspectives and experiences are represented. In this paper, the nature of child-researcher relationships and researchers’ positions are examined to further understanding of how to account for the impact of contexts on meaning making in research with children. An integrative literature review of articles concerned with child protection identified a paucity of researcher accounts of reflexivity. The review articles contain…
Sociology of Education and Construction of Educational Policies : From the Theory to the Practice
2020
A crescente complexidade no desenvolvimento de políticas públicas traduziu-se pelo aumento significativo no envolvimento de especialistas, muitos deles cientistas. Esse envolvimento é expresso de várias maneiras, seja através de solicitações de estudos preliminares, processos de planeamento ou avaliações da implementação e do impacto de medidas políticas. O desenvolvimento da relação entre os campos científico e político desafia o papel dos cientistas como especialistas e do uso do conhecimento científico, bem como as relações de poder entre políticos e cientistas. A sociologia da educação em Portugal tem uma longa tradição de interação com o campo político, não apenas em estudos relacionad…
Mechanical and neural stretch responses of the human soleus muscle at different walking speeds
2009
During human walking, a sudden trip may elicit a Ia afferent fibre mediated short latency stretch reflex. The aim of this study was to investigate soleus (SOL) muscle mechanical behaviour in response to dorsiflexion perturbations, and to relate this behaviour to short latency stretch reflex responses. Twelve healthy subjects walked on a treadmill with the left leg attached to an actuator capable of rapidly dorsiflexing the ankle joint. Ultrasound was used to measure fascicle lengths in SOL during walking, and surface electromyography (EMG) was used to record muscle activation. Dorsiflexion perturbations of 6 deg were applied during mid-stance at walking speeds of 3, 4 and 5 km h(-1). At eac…
The Hoffmann reflex of human plantar foot muscles
1998
Electrical stimulation of the tibial nerve in the popliteal fossa evoked an M wave (10.9 ms) and a late reflex response (38.1 ms) in the plantar foot muscles of all 10 volunteers. The late response had a somewhat lower electrical threshold than the corresponding M wave (8.5 versus 9 mA), and reached a maximum of amplitude when the stimulus intensity was increased, but was strongly suppressed by further increased intensity. A more distal stimulation of the tibial nerve at the ankle shortened the onset latency of the M wave and lengthened that of the late response. The reflex was facilitated by activation of synergists and inhibited by activation of antagonists. We showed that the late respon…
Effects of prolonged walking on neural and mechanical components of stretch responses in the human soleus muscle
2009
After repeated passive stretching, tendinous tissue compliance increases in the human soleus (SOL) muscle–tendon unit. During movement, such changes would have important consequences for neural and mechanical stretch responses. This study examined the existence of such effects in response to a 75 min walking intervention. Eleven healthy subjects walked on a treadmill at 4 km h−1 with a robotic stretch device attached to the left leg. Ultrasonography was used to measure SOL fascicle lengths, and surface EMG activity was recorded in the SOL and tibialis anterior (TA) muscles. Perturbations of 6 deg were imposed at three different measurement intervals: Pre (immediately before the walking inte…
Age dependency of neuromuscular function and dynamic balance control
2010
Abstract The purpose of the present study was to examine whether static and dynamic balance control are related to neuromuscular function and ageing. For this purpose, we constructed a new dynamic balance measurement system that simulates natural falling. Ten young (age 21–31 years) and 20 elderly (age 60–70 years) men participated in the experiment. Maximal isometric torque (MVC) and activation level were measured from the quadriceps and plantar flexor muscles. The H-reflex, V-wave, and maximal M-wave were measured from the soleus muscle. In dynamic balance control, anterior-posterior centre-of-pressure swaying was 74±8.1 mm in the young men and 91.5±19.4 mm in the elderly men (P<0.05), wh…
Ilustración apologética al primero, y segundo tomo del Teatro Critico : donde se notan mas de quatrocientos descuidos al Autor del Anti-Teatro; y d…
1777
Sig. a-b8, A-Dd8 Justa repulsa de iniquas acusaciones : Carta en que, manifestando las imposturas, que contra el Teatro Crítico, y su Autor diò ... Francisco Soto Marne...escribe ... Feijoó Són 2 t. en 1 vol. - Notes a peu de pag. - Reclams
Ethics and Politics in Spanish Universities. The research assessment as a Technology of Subjectivity
2013
Through our work, we seek to analyse critically the transformation of educational subjectivities produced by discourses and practices within the framework of the current reform process that Spanish universities are undergoing. This transformation is linked to neoliberal government rationales , but we would like to describe it taking into account the local coordination modalities which characterize the context of Spanish universities. To do so, we focus on a technology which structures and feeds on discourses and key practices in the reform process: the six-year research period (sexennium). As a technology of subjectivity , it represents a system of thought involved in the development of mor…
Historicism: Some Thoughts on Life-World
1993
More than three decades ago, Walter Biemel read a paper at the Third Colloquium of Philosophy at Royaumont on “The Decisive Phases in the Development of Husserl’s Philosophy” that seemed to be definitive.1 Notwithstanding the great value of the facts and reflections that he provided, and the numerous studies devoted afterwards to the same problem, it is not easy to fix different stages in Husserl’s work. This difficulty is increased by the lack of a strict synchrony between the works that Husserl himself published and those that remained unpublished after his death and have been laboriously recovered by his disciples. Actually, in manuscripts belonging to early moments in his life we find t…