Dynamic and isometric protocols of knee extension: Effect of fatigue on the EMG signal

The objective of this study was to analyze the electromyographic (EMG) signal behavior of rectus femoris (RF), vastus medialis (VM), vastus lateralis (VL) and biceps femoris (caput longum) (BFCL) from nine women during fatiguing dynamic and isometric knee extensions tests and to determine their EMGFT (Electromyographic Fatigue Threshold). Surface electrodes, biological signal acquisition module, analogical-digital converter board and specific software were used. The RMS (Root Mean Square) values obtained from concentric phase (80 to 30 degrees) of the dynamic knee extension andfrom isometric contraction were correlated with time on each load by linear regression analysis. The respective slopes were correlated with the correspondent load to determine the EMGFT. Force (Kgf) and median frequency - MF (Hz) obtained during MIVC (Maximal Isometric Voluntary Contraction) performed before and after the fatiguing tests were calculated in Matlab environment. The results demonstrated that the endurance time decreases with higher loads the EMG amplitude increase with time and was greater at higher loads, between muscles in dynamic exercise the RF and VL showed higher slopes, and in isometric exercise the VL showed the same behavior The EMGFT values were similar in both exercises; the force values predominantly decreased after fatiguing tests; however the MF only decreased after some loads. The protocols proposed allowed standardizing protocols at least to induce the fatigue process and to determine the EMGFT as an endurance indicative, which may be used to evaluate the effectiveness of rehabilitative or training interventions indicated to reduce muscle weakness and fatigue.

O uso do computador em escolas públicas estaduais da cidade de Limeira/SP

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

O processo de (re) construção da prática pedagógica de professores de língua inglesa em formação inicial

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Proposta teórico-metodológica para análise de inserções parentéticas em chat educacional no ensino de língua espanhola =: Propuesta teórico-metodológica para el análisis de inserciones parentéticas en chat educacional en la enseñanza de lengua española

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Variantes motivacionais de professores de língua Inglesa em um curso de formação inicial

This paper aims at discussing the relevance of student-teachers’ motivational variants in an English as a Foreign Language Teacher Education course whose syllabus proposes, since the beginning of the program, the development of students’ proficiency in the target language aligned to EFL teacher education theories. In addition, this study also intends to comprehend how this course structure has been developed, verifying how prospective teachers react towards its proposal. Results indicated relevant aspects related to motivation, since from all participants, many declared their interest in following the teaching career while others revealed interest in developing their English language skills, which indicates that both needs and expectations of these groups seemed to be attained, favoring their motivation to language learning and teaching.

Função afim e suas propriedades através da resolução de problemas

Pós-graduação em Matemática em Rede Nacional - IBILCE