Busca avançada
Ano de início
(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Grip and load force coordination in cyclical isometric manipulation task is not affected by the feedback type

Texto completo
Pedao, Sabrina Tiago [1, 2] ; Barela, Jose Angelo [1, 2, 3] ; de Almeida Lima, Kaue Carvalho [1, 2] ; de Freitas, Paulo Barbosa [1, 2]
Número total de Autores: 4
Afiliação do(s) autor(es):
[1] Cruzeiro do Sul Univ, Inst Phys Act & Sport Sci, BR-01506000 Sao Paulo - Brazil
[2] Cruzeiro do Sul Univ, Grad Program Human Movement Sci, BR-01506000 Sao Paulo - Brazil
[3] Sao Paulo State Univ Rio Claro, Biosci Inst, Dept Phys Educ, BR-13506900 Sao Paulo - Brazil
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Citações Web of Science: 2

Background: The relationship between normal and tangential force components (grip force - GF and load force - LF, respectively) acting on the digits-object interface during object manipulation reveals neural mechanisms involved in movement control. Here, we examined whether the feedback type provided to the participants during exertion of LF would influence GF-LF coordination and task performance. Methods: Sixteen young (24.7 +/- 3.8 years-old) volunteers isometrically exerted continuously sinusoidal F-Z (vertical component of LF) by pulling a fixed instrumented handle up and relaxing under two feedback conditions: targeting and tracking. In targeting condition, F-Z exertion range was determined by horizontal lines representing the upper (10 N) and lower (1 N) targets, with frequency (0.77 or 1.53 Hz) dictated by a metronome. In tracking condition, a sinusoidal template set at similar frequencies and range was presented and should be superposed by the participants' exerted F-Z. Task performance was assessed by absolute errors at peaks (AE(Peak)) and valleys (AE(Valley)) and GF-LF coordination by GF-LF ratios, maximum cross-correlation coefficients (r(max)), and time lags. Results: The results revealed no effect of feedback and no feedback by frequency interaction on any variable. AE(Peak) and GF-LF ratio were higher and r(max) lower at 1.53 Hz than at 0.77 Hz. Conclusion: These findings indicate that the type of feedback does not influence task performance and GF-LF coordination. Therefore, we recommend the use of tracking tasks when assessing GF-LF coordination during isometric LF exertion in externally fixed instrumented handles because they are easier to understand and provide additional indices (e.g., RMSE) of voluntary force control. (AU)

Processo FAPESP: 10/02939-4 - A função manual em pacientes diabéticos neuropatas: controle e coordenação de forças que agem na interação dedos-objeto em tarefas manipulativas
Beneficiário:Paulo Barbosa de Freitas Júnior
Linha de fomento: Auxílio à Pesquisa - Regular