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Hahn's symmetric quantum variational calculus

We introduce and develop the Hahn symmetric quantum calculus with applications to the calculus of variations. Namely, we obtain a necessary optimality condition of Euler{Lagrange type and a sufficient optimality condi- tion for variational problems within the context of Hahn's symmetric calculus. Moreover, we show the effectiveness of Leitmann's direct method when applied to Hahn's symmetric variational calculu...

Kinematical and neuromuscular assessment of the rowing exercise in the upright ...

Kinematical and neuromuscular assessment of the rowing exercise in the upright ...

The aim was to assess the interaction between kinematics and neuromuscular responses of subjects performing the rowing exercise with barbell in group fitness classes with different external loads and cadences. Fifteen male subjects performed nine sets of nine repetitions of the selected exercise. Sets were composed by a pair wise combination of different external loads (5, 10 and 20 [kg]) and cadences (1, 2 and...

Kinematical and neuromuscular assessment of the rowing exercise in the upright ...

The aim was to assess the interaction between kinematics and neuromuscular responses of subjects performing the rowing exercise with barbell in group fitness classes with different external loads and cadences.

The evolution of swimming science research: Content analysis of the “Biomechani...

The aim of this study was to analyze the evolution of the swimming science research based on the content analysis of the “Biomechanics and Medicine in Swimming” Proceeding books series from 1971 to 2006. The content of all the 622 papers published in the Proceeding books of the Symposiums of Biomechanics and Medicine in Swimming were evaluated. Two main categories were defined: (i) The “Aquatic activity” studie...

Preliminary attempt to develop a path-flow analysis model for swimming performa...

The aim of this research was to develop a path-flow analysis model from age-group swimmer’s performance based on biomechanical and energetic parameters. Twenty two young male age-group swimmers with several competitive levels volunteered to serve as subjects. It was assessed swim velocity, stroke length, stroke frequency, stroke index, propulsive efficiency, critical velocity and 200 m freestyle event performan...

Comparação electromiográfica do passe e do remate em Futsal

Foi objectivo deste trabalho comparar a actividade neuromuscular do membro inferior na execução do remate e do passe com o dorso do pé no Futsal. Estudaram-se 5 sujeitos do sexo masculino e federados com idades compreendidas entre os 20 e os 26 anos. Foram analisadas duas condições de execução: o passe e o remate. O passe foi efectuado para um jogador colocado à sua frente e a seis metros de distância. O remate...

Evolution on Swimming Science Research: content analysis of the “Biomechanics a...

Swimming seems to be one of the sports more studied . More than one decade ago, Clarys (1996) made an content analysis of the research about swimming. However, in these last 13 years several developments happened in the aquatic activities.

Aplicação da análise exploratória de dados na discriminação geográfica do quiab...

Foram analisadas amostras de quiabo dos municípios de Caruaru e Vitória de Santo Antão, em Pernambuco, assim como nos municípios de Ceará-Mirim, Macaíba e Extremoz no estado do Rio Grande do Norte. A aplicação de dois métodos de análise exploratória de dados: Análise de Componentes principais - PCA e Análise de Agrupamentos Hierárquicos - HCA permitiu a discriminação geográfica do quiabo proveniente dos dois es...

Evolution in swimming “science” research

The aim of this study was to analyze the evolution of the swimming “science” research in the last decades. The content of all the 622 papers published in the Proceedings books of the Symposiums of Biomechanics and Medicine in Swimming from 1971 to 2006 was analyzed. It was adopted the procedures described for content analysis by Queirós and Botelho (in press). The main “scientific area” applied for the study of...