RESUMONo estudo da biomecânica do ciclismo diversas técnicas têm sido utilizadas para descrever e compreender o movimento da pedalada. O objetivo deste estudo é propor uma metodologia para a avaliação de ciclistas sob o ponto de vista das forças aplicadas no pedal. Um ciclista de elite foi avaliado por meio de um protocolo que consistiu em alterar o selim em quatro diferentes posições (deslocado para cima, para baixo, para frente e para trás) a partir da posição de referência, especificamente, aquela adotada para treinamento pelo ciclista. A mudança no ajuste do selim foi de 1 cm. A bicicleta do atleta foi acoplada a um ciclossimulador magnético. A carga do teste foi normalizada por um critério fisiológico (segundo limiar ventilatório), simulando o ritmo de prova do atleta. O pedal direito foi substituído por um pedal bidimensional instrumentado para registrar as forças normal e tangencial. A média do impulso angular da força efetiva foi calculada a partir de dez ciclos consecutivos de pedalada. As mudanças na posição do selim modificaram o impulso da força efetiva em relação à posição de referência. Sendo assim, o protocolo é eficaz e pode ser aplicado em diferentes situações.Palavras-chave: ciclismo, biomecânica, desempenho. ABSTRACTMany techniques have been used in biomechanics to describe the cycling movement. The purpose of this study is to proposal a specific methodology to evaluation the forces applied on the pedal. An experienced elite cyclist was submitted to a protocol which consisted of four different saddle positions (upward, downward, forward, and backward) assuming as reference position the one used by the cyclist in training and competition. The displacement of the saddle was of 1cm in all tests. The individual's bicycle was connected to a magnetic cycle simulator. The load was normalized by a physiological criterion (ventilatory threshold), to simulate the cyclist's race rhythm. The right regular pedal was replaced by a 2D instrumented pedal to record the force normal and tangential components applied on it. Mean impulse of the angular effective force was calculated from ten consecutive pedaling cycles. The four different saddle positions have modified the effective angular pedaling impulse comparing with the reference position. Relatively small saddle adjustments may affect the effective angular pedaling impulse and supposedly cycling performance. Keywords INTRODUÇÃOPara estudar a biomecânica do ciclismo diversas ferramentas têm sido utilizadas para a melhor compreensão do movimento da pedalada. A grande variedade de procedimentos adotados em estudos envolvendo ciclismo tem levado os pesquisadores a discutir a aplicação dos mesmos (1)(2)(3) . Dentre os protocolos utilizados em avaliações de ciclistas, destaca-se a utilização simultânea de parâmetros fisiológicos e biomecânicos na tentativa de elucidar as variáveis relacionadas ao gesto da pedalada (3)(4)(5)(6)(7)(8) . Em avaliações fisiológicas de ciclistas de alto rendimento normalmente tem sido utilizado o consumo máximo de oxigênio (VO 2MÁX ...
IntroduCtIonDuring recent decades, the study of human gait has been widely spread among the various sports research centers.1 Many surveys were developed aiming to study the relationship between physical activity and injuries, particularly those related to running. 2Studies associating the behavior of the subtalar joint angle (subtalar pronation) and the type of shoe used for running activities, have achieved significant importance in the pursuit of a better understanding of lesions involving the hip, knee, ankle and foot. 2 It is widely known in literature that excessive pronation of the subtalar joint of the foot (Figure 1), understood as foot eversion, dorsiflexion and abduction, which occur respectively in the frontal, sagittal and transversal planes, is closely related to joint injuries, particularly of the lower limbs. The maximum subtalar pronation value, generally reached between 20 and 40% of the stance phase (Figure 2), is mainly influenced by the running linear speed, by muscular unbalance and/or hypermobility joint, and by the running technique imposed by the runner. ABSTRACTIntroduction: Many studies have analyzed the maximum subtalar pronation without any concern over the choice of model for determining this variable. Objective: To compare the maximum subtalar pronation and its moment of occurrence during the stance phase, determined based on two mathematical models consisting of two and four reference points, respectively. Method: Sixteen runners participated in two running economy tests on a treadmill at speeds of 16 and 17 km.h
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.