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Search Results: 1 - 10 of 7162 matches for " Felipe Pivetta Carpes "
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Relationship between foot sensibility and postural control in the young and elderly. http://dx.doi.org/10.5007/1980-0037.2013v15n1p215
Letícia Suemi Ueda,Felipe Pivetta Carpes
Revista Brasileira de Cineantropometria e Desempenho Humano , 2013,
Abstract: Impairments in the foot sensitivity in the elderly cause changes in locomotion and postural control that may increase fall risk. Understanding the use of foot afference in the elderly may help preventing loss of mobility and fall. However, there are few studies addressing the relation between the sensitivity of different foot regions and postural control. To investigating this lack in literature, the objective of our study was to assess the relationship between foot sensibility and postural control in young and elderly. Forty-two subjects volunteered to this study; they were assigned to a group according to their age (young or elderly). The participants were assessed regarding anthropometry, foot sensibility (using monofilaments) and postural control (using a force plate). The indexes of foot sensibility and postural control were correlated and compared between the groups. Elderly had worst foot sensibility and postural control than young. Center of pressure are and amplitude in antero-posterior direction were correlated with the general foot sensibility, but not with a specific point of the foot in the elderly. For young, the sensitivity in the forefoot region was related to improved postural control.
Influência da pedalada com os joelhos tangenciando o quadro da bicicleta sobre a ativa??o dos músculos do membro inferior
Bini, Rodrigo Rico;Carpes, Felipe Pivetta;Diefenthaeler, Fernando;
Revista Brasileira de Educa??o Física e Esporte , 2011, DOI: 10.1590/S1807-55092011000100004
Abstract: cyclist's body position on the bike has been related to changes in muscle activation. therefore, the aim of the present study was to compare the activation of tibialis anterior, gastrocnemius medialis, biceps femoris, rectus femoris, vastus lateralis, adductor longus e gluteus maximus muscles in three conditions: 1) reference position (preferred position); 2) adduction position (knees almost touching the bicycle frame); 3) abduction position (knees away from the bicycle frame). six athletes with competitive experience in cycling were evaluated using surface electromyography. they pedalled using their own bicycles mounted on a wind-trainer, with a workload relative to the second ventilatory threshold. muscle activation was defined by the mean value of the rms envelope and by the activation period for the three evaluated positions. there were no significant differences in muscles' rms or activation period between the three positions, except for the adductor longus muscle. in adduction position, this muscle was more activated (36 ± 6%), compared to the abduction position (25 ± 11%) for a significance level of p = 0.02, without significant differences for the reference position (27 ± 7%). these results indicate that there is no substantial difference in the activation of the most important muscles of the lower limb when the position of the knee is changed in the frontal plane for the same workload level, with the adductor longus as an exception.
Effects of knee frontal plane position on pedal forces during cycling: A preliminary study
Rodrigo Rico Bini,Felipe Pivetta Carpes,Fernando Diefenthaeler
Revista Brasileira de Cineantropometria e Desempenho Humano , 2009,
Abstract: The purpose of this study was to compare the force applied to the pedal when cycling with the knees almost touching the bicycle frame (adduction position) compared to the position usually adopted by cyclists (reference position) and a position of the knees away from the bicycle frame (abduction position). Six cyclists were evaluated. Maximal oxygen uptake (VO2MAX) was defined, and then the three different knee positions on the frontal plane were assessed. Three minutes of cycling in the reference position, adduction position and abduction position were conducted, using oxygen uptake (VO2) at which the cyclists had achieved the second ventilatory threshold. An instrumented two-dimensional pedal was used to measure the forces applied to the right pedal. The average VO2 and power output did not differ between the adduction (50.4±6.9 ml.kg-1.min-1 and 263±29 W), abduction (50.8±5.9 ml.kg-1.min-1 and 250±46 W) and reference position (50.4±5.9 ml.kg-1.min-1 and 246±47 W). Pedaling cadence increased significantly during adduction (94±8 rpm) and abduction (95±5 rpm) compared to the reference position (89±8 rpm). The force results indicated no differences in the effective force or effectiveness index between the reference, adduction and abduction positions. Resultant force increased during adduction (284.5±44.5 N) compared to the reference position (246.9±39.2 N). The results indicate that the cyclists were able to generate higher resultant force during cycling with the knees close to the bicycle frame, but were unable to effectively transmit this force to the movement.
Felipe Pivetta Carpes,Rodrigo Rico Bini,Carlos Bolli Mota
Brazilian Journal of Biomotricity , 2008,
Abstract: This study was designed to investigate the training level, perception and bilateral asymmetry of force applied on the pedals of a leg-press machine during multi-joint leg-press exercise. Force data were acquired throughout the exercise by means of an FSCAN system with sensitive insoles adapted to the right and left pedals of a leg-press device and used to determine the bilateral asymmetry. Perception of bilateral asymmetry was evaluated by means of an inventory including two closed questions. Two groups according to their training experience were considered: subjects adapted (n=8), and trained (n=8). The results suggest that trained subjects present a smaller asymmetry index and a better perception of bilateral asymmetries. Trained subjects presented better perception of bilateral asymmetries, when it occurs during the exercise, than adapted subjects. The training seems to influence the perception and reduce the bilateral asymmetries during the leg-press multi-joint exercise.
Preference and torque asymmetry for elbow joint
Carpes, Felipe Pivetta;Geremia, Jeam Marcel;Karolczak, Ana Paula Barcellos;Diefenthaeler, Fernando;Vaz, Marco Aurélio;
Motriz: Revista de Educa??o Física , 2012, DOI: 10.1590/S1980-65742012000200012
Abstract: extensively unilateral recruitment for daily activities may determine performance asymmetries in favor of the preferred side eliciting functional adaptation. our study evaluated asymmetries in elbow torque output between preferred and non-preferred limbs. eighteen subjects performed maximal elbow flexor and extensor isometric contractions at five different elbow joint angles (0o, 30o, 60o, 90o, 120o) and five different angular velocities (60, 120, 180, 240, 300o.s-1) on an isokinetic dynamometer. higher flexor torque in favor of preferred arm was observed at 90o of flexion (p<0.05), which also corresponded to the highest torque produced (p<0.05). the fact that joint angle influenced torque asymmetries, whereas angular velocity did not, suggest that the observed asymmetry is likely related to preferential recruitment of elbow flexors at a 90o joint angle for daily tasks requiring high levels of force production. muscle functional adaptation to frequent stimuli at this joint angle in healthy subjects may explain these results.
Esfor?o percebido e cinemática em percentuais da velocidade crítica na nata??o
Franken, Marcos;Diefenthaeler, Fernando;Carpes, Felipe Pivetta;Castro, Flávio Ant?nio de Souza;
Motriz: Revista de Educa??o Física , 2011, DOI: 10.1590/S1980-65742011000400016
Abstract: the aim of the present study was to investigate the effects of different percentages of critical speed (cs) in the heart rate (hr), the mean stroke rate (sr), the mean stroke length (sl), and perceived exertion (pe) in front crawl. fifteen swimmers of both genders performed five repetitions of 200 m at different percentages of cs (90, 95, 100, 103, and 105%), in random order. hr, pe and sr showed a significant positive correlation with the percentage of cs (rho = 0.585, p <0.001, rho = 0.720, p <0.001, rho = 0.489, p <0.001, respectively). however the sl showed no significant correlation with the percentages of cs (rho = -0.151, p> 0.05). the results from percentages of cs may help coaches to understand the impact of responses related to the internal load during training program.
Aspectos determinantes do posicionamento corporal no ciclismo: uma revis?o sistemática
Kleinpaul, Julio Francisco;Mann, Luana;Diefenthaeler, Fernando;Moro, Ant?nio Renato Pereira;Carpes, Felipe Pivetta;
Motriz: Revista de Educa??o Física , 2010, DOI: 10.5016/1980-6574.2010v16n4p1013
Abstract: by means of systematic review a surveying of english and portuguese language studies concerning the expected body positioning for improvement of cycling. search engines used were lilacs, sciencedirect, scielo and medline. the keywords used to find relevant papers were: posicionamento corporal + ciclismo; ajuste + bicicleta; postura + ciclismo; body positioning + cycling; bicycle fitting; cycling posture. original papers, short review papers, master thesis and books published from 1993 to 2009 (october) were considered when the main subject of discussion was the topic of interest. a total of 20 studies were considered. in general, the studies suggest that is will be useful to know about the bicycle fitting. even so protocols for body positioning evaluation are available, most of studies concluded that cyclists are not able to use this protocol correctly. it suggests the difficult to access studies.
Revis?o etiológica da lombalgia em ciclistas
Di Alencar, Thiago Ayala M.;Matias, Karinna F. S.;Bini, Rodrigo R.;Carpes, Felipe Pivetta;
Revista Brasileira de Ciências do Esporte , 2011, DOI: 10.1590/S0101-32892011000200016
Abstract: low back pain is a common disorder in cyclists and it's occurrence has long been related mainly to a lack of flexibility. the aim of this study was to review the etiologic factors of low back pain in cyclists cited by articles from scielo, pubmed and scopus, published from 1965 to 2011, indicated, when appropriate, by books cited in these articles. the results indicated that excessive trunk flexion, leg length discrepancy, frame size and/or other components of inappropriate length, poor bike fit or improper bike fit, lumbopelvic muscle weakness, poor flexibility and postural deviations may compromise performance and comfort of the cyclist on the bike, especially during long distance riding and may lead to the development of low back pain. therefore, the cyclist with back pain should be evaluated based on different variables described in literature with the purpose of identifying the etiologic factors may trigger lumbar dysfunction to make the necessary corrections.
Analysis of the crank angular velocity with use of cinemetry methods and reed-switch sensors
Felipe Pivetta Carpes,Frederico Dagnese,Inácio da Fontoura Limberger,Mateus Rossato
Revista Brasileira de Cineantropometria e Desempenho Humano , 2006,
Abstract: This study analyzed the crank angular velocity across the pedaling cycle. The purpose was to compare values obtained from kinematic analysis to data gained through reed- switch sensors, which consider the cycle to have a constant angular velocity. Four well-trained cyclists were evaluated. The kinematic analysis was performed by using the Peak Motus System. The values of crank angular velocity at the four cycle quadrants were tested for differences. The results showed that velocity was not constant, because significant differences were observed among the cycle quadrants. The findings suggested that it is necessary to use more than one reed-switch sensors across the cycle, so that velocity variations may be detected. Furthermore, crank angular velocity can be used as a prime tool to analyse the subject’s pedaling technique. RESUMO Este estudo analisou a velocidade angular do pé-de-vela ao longo do ciclo de pedalada. O objetivo foi comparar os valores encontrados com a análise cinemática em rela o ao uso de sensores reed-switch, que consideram o ciclo como com velocidade angular constante. Quatro ciclistas bem treinados foram avaliados. A análise cinemática foi realizada com o uso do Sistema Peak Motus. A velocidade angular do pé-de-vela foi comparada nos quatro quadrantes do ciclo. Os resultados mostraram que a velocidade angular do pé-de-vela n o pode ser considerada constante, porque diferen as estatisticamente significativas foram observadas entre os quadrantes. Em rela o ao uso de sensores reed-switch, sugere-se o posicionamento de mais de um sensor ao longo do ciclo, com o objetivo de n o ignorar as diferen as observadas na velocidade. A análise dos resultados revelou também que a velocidade angular do pé-de-vela pode ser uma ferramenta inicial para análise da técnica de pedalada.
Estimation of the forces acting on the tibiofemoral joint during knee extension exercises performed on an open kinetic chain strength-training machine
Rodrigo Rico Bini,Felipe Pivetta Carpes,Joelly Mahnic de Toledo,Jefferson Fagundes Loss
Revista Brasileira de Cineantropometria e Desempenho Humano , 2008,
Abstract: The objectives of this study were to: (1) evaluate the resistive torque of an open kinetic chain strength-training machine for performing knee extensions, and (2) perform an analysis estimating internal forces in the tibiofemoral joint. During a fi rst phase of the study, measurements were taken of the machine under analysis (external forces), and then calculations were performed to estimate forces on the lower limb (internal forces). Equations were defi ned to calculate human force (HF), and the moment of muscular force (MMF). Perpendicular muscular force (MFp) and joint force (JFp), axial muscular force (MF”) and joint force (JF”), and total muscular force (MF) and joint force (JF) were all calculated. Five knee angles were analyzed (zero, 30, 45, 60, and 90 degrees). A reduction was observed in HF at higher knee angles, while MF and JF also increased at the same time. HF was always lower than the load selected on the machine, which indicates a reduced overload imposed by the machine. The reduction observed in MFp and JFp at higher knee angles indicates a lower tendency to shear the tibia in relation to the femur. At the same time, there was an increase in JF” due to higher MF”. The biomechanical model proposed in this study has shown itself adequate for the day-to-day needs of professionals who supervise orient strength training. resumo Os objetivos do presente estudo foram: (1) avaliar o torque de resistência (TR) de uma máquina de muscula o para a realiza o do exercício de extens o dos joelhos em cadeia cinética aberta e (2) realizar um ensaio teórico a partir do comportamento do TR com o intuito de estimar as for as internas na articula o tíbio-femoral. O estudo foi realizado em dois momentos: (1) medi es da máquina utilizada e (2) estimativa das for as externas (na máquina) e internas (no membro inferior). Foram utilizadas equa es baseadas em um modelo mecanico bi-dimensional para o cálculo das componentes perpendiculares e axiais da for a muscular (FMp e FM”, respectivamente) e da for a articular (FAp e FA”, respectivamente), assim como de suas resultantes (for as muscular, FM; articular, FA e humana, FH). As variáveis foram mensuradas em cinco angulos de fl ex o do joelho (zero, 30, 45, 60 e 90 graus). Observou-se uma redu o da FH com o aumento do angulo de fl ex o do joelho, enquanto FM e FA apresentam aumento. O valor da FH apresentou-se sempre menor ao valor da for a resistiva (FR), indicando que a máquina reduz a sobrecarga imposta ao executante. Observa-se uma redu o da FMp e FAp nos maiores angulos de fl ex o do joelho, indicando u
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