Share this Abstract

Rate this Abstract

Login to allow rating

Views

Login to allow views

Options


Abstract Details

Abstract Title

Anticipatory Postural Adjustments in upper limb of recurve archery

Abstract Theme

Elite performance

Type Presentation

Oral presentation

Abstract Authors

Presenter Nadjila Tejo Machado - University of São Paulo (School of Arts, Sciences and Humanities) - BR
Fernando Carvalheiro Reiser - University of São Paulo (School of Arts, Sciences and Humanities) - BR
Elder de Sousa Palha Santos - University of São Paulo (School of Arts, Sciences and Humanities) - BR
Tuany Toribio Valtner - University of São Paulo (School of Arts, Sciences and Humanities) - BR
Ulysses Fernandes Ervilha - University of São Paulo (School of Arts, Sciences and Humanities) - BR
Marcelo Saldanha Aoki - University of São Paulo (School of Arts, Sciences and Humanities) - BR
Fernando Henrique Magalhães - University of São Paulo (School of Arts, Sciences and Humanities) - BR
Luis Mochizuki - University of São Paulo (School of Arts, Sciences and Humanities) - BR

Presentation Details

Room: Urano        Date: 4 September        Time: 10:40:00        Presenter: Nadjila Machado

Abstract Resume

Background: Archery needs static balance, trunk and upper limb strength and coordinate agonist and antagonist muscles of the forearm to shoot the arrows. Postural adjustments
stabilize posture during task by means of Anticipatory Postural Adjustments (APAs), this control the position of the center of mass of the body by activating of muscles before a disturbance of body,
minimizing the risk of losing balance. Consistency in posture is very important for hit the target. The sequence of activation of postural muscles is task-depend. The objective of this study is to
analyze the temporal pattern of electromyographic (EMG) activity of archers in Olympic simulation.
Methods: 11 archers participated into this study (age: 21.1±1.4, experience: 6.8±1.5years). The surface electromyography of several muscles (Extensor Digitorum, Flexor Digitorum,
Biceps Brachial, Triceps Brachial) were recorded, filtered, demeaned and rectificed. Sampling frequency was 2 kHz. Twelve 6-arrows groups (72 arrows) were shot by each archer to target 70 m away.
Processed EMG signal divided in 50 ms pre and post clicker to period of APA. Data of mean values and standard deviation correspond of EMG signal during the APA.
Results: Extensor Digitorum (0,04±0,04), Flexor Digitorum (0,04±0,06), Biceps Brachial (0,02±0,02), Triceps Brachial (0,07±0,11). In literature, until then use 2 forms for analyze
archers: 3 periods of 1 second each, 2 periods of 1 second. Archer beginner toe extension in 25ms before shoot, and there are two techniques for shoot: relax the Flexor Digitorum or toe extension.
Strategy of correct muscular contraction hope by hit the target, there are many options for execute a task.
Conclusions: Extensor Digitorum and Biceps Brachial have similar differences in EMG when compare standard deviation. Triceps Brachial and Flexor Digitorum present more varibility
because standard deviation is bigger than mean for EMG.


Comment this abstract (0 comments)