Concentric Contractions
Mostrando 1-12 de 14 artigos, teses e dissertações.
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1. Effect of an experimental fatigue protocol applied to the quadriceps femoris muscle of physically active persons
Abstract Aims: The purpose of this study was to test an experimental fatigue protocol for the knee joint extensor muscles performed on an isokinetic dynamometer. Method: SPIRIT recommendations were applied. Participants were 40 healthy, young men and women. Protocol: The pre-fatigue quadriceps femoris peak torque during concentric maximum voluntary contra
Motriz: rev. educ. fis.. Publicado em: 13/12/2019
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2. Time to task failure of the contralateral untrained limb after high load-low repetition eccentric and low load-high repetition resistance training
Abstract Aims: Cross-training is the process whereby training of one limb gives rise to enhancements in the performance of the opposite, untrained limb and may be dependent on type of muscle contractions performed. The aim of this study was to investigate whether unilateral resistance training using eccentric contraction is more effective than concentric res
Motriz: rev. educ. fis.. Publicado em: 15/05/2017
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3. A single bout of exercise with a flexible pole induces significant cardiac autonomic responses in healthy men
OBJECTIVES: Flexible poles can provide rapid eccentric and concentric muscle contractions. Muscle vibration is associated with a "tonic vibration reflex” that is stimulated by a sequence of rapid muscle stretching, activation of the muscle spindles and stimulation of a response that is similar to the myotatic reflex. Literature studies analyzing the acute
Clinics. Publicado em: 2014-09
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4. Reliability of isokinetic evaluation in passive mode for knee flexors and extensors in healthy children
BACKGROUND: The isokinetic dynamometer has been considered the gold-standard measurement of muscle performance. However, the reliability for the passive mode in children has not been reported to date. OBJECTIVES: The purpose was to evaluate the reliability of the isokinetic dynamometer in passive mode in children. METHOD: Twenty-one healthy child
Braz. J. Phys. Ther.. Publicado em: 2013-04
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5. Low-frequency fatigue at maximal and submaximal muscle contractions
Skeletal muscle force production following repetitive contractions is preferentially reduced when muscle is evaluated with lowfrequency stimulation. This selective impairment in force generation is called low-frequency fatigue (LFF) and could be dependent on the contraction type. The purpose of this study was to compare LFF after concentric and eccentric max
Publicado em: 2011
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6. Estudo das alterações no volume muscular, na função articular e na marcha de hemiparéticos crônicos
This work consists of two studies. The aim of the first study was to investigate quadriceps and hamstring muscle volumes and strength deficits of the knee extensors and flexors in people with chronic hemiparesis compared to a healthy group. Fifteen individuals with chronic stroke and fifteen healthy individuals took part in this study. Motor function, quadri
Publicado em: 2010
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7. Low-frequency fatigue at maximal and submaximal muscle contractions
Skeletal muscle force production following repetitive contractions is preferentially reduced when muscle is evaluated with low-frequency stimulation. This selective impairment in force generation is called low-frequency fatigue (LFF) and could be dependent on the contraction type. The purpose of this study was to compare LFF after concentric and eccentric ma
Brazilian Journal of Medical and Biological Research. Publicado em: 2009-04
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8. Efeito agudo e crônico do exercício resistido de alta intensidade sobre o torque, atividade eletromiográfica do vasto lateral e freqüência cardíaca de homens idosos.
The objective of this study was to investigate the acute and chronic effects of high intensity resistance physical exercise on the magnitude of maximal average torque response normalized by body mass (MAT), RMS amplitude of eletromyographic signals (EMGs) of the vastus lateralis and heart rate variation (∆HR). Subjects were nine non-smoking men (ages 6
Publicado em: 2007
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9. Evaluation of the hip muscles mechanical behavior in transfemoral amputees / Avaliação do comportamento mecânico dos músculos do quadril em amputados transfemorais
Introduction Amputation at the transfemoral level leads to anatomical and functional adaptations that change the gate pattern and influences daily-life activities. It is well known that the side of the amputation presents lower force. However, it is not known if there is a specific angular position or angular velocity in that the force is even lower. Moreove
Publicado em: 2006
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10. v Effects of aging and osteoporosis on thoracic kyphosis, on proprioception and on trunk muscle torque. / Efeitos do envelhecimento e da osteoporose na cifose torácica, na propriocepção e no torque dos músculos do tronco.
The aim of this study was to evaluate the effects of aging and osteoporosis on thoracic kyphosis degree, on extensors and flexors trunk muscles torque and on proprioception. Moreover, this study investigated the possible correlation among the variables studied in this work. It was evaluated 40 voluntary women, divided in four distinct groups: Young Group (10
Publicado em: 2005
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11. Estudo da modulaÃÃo autonÃmica em funÃÃo da variabilidade da freqÃÃncia cardÃaca em hipertensos com e sem hipertrofia ventricular esquerda concÃntrica
This is a study of autonomic modulation as a function of heart rate variability through the time and frequency domains using 24h-Holter signals in hypertensives with and without concentric left ventricular hypertrophy (LVH), correlating the latter with cardiac arrhythmias. The data from a sample of 108 mild, moderate or severe hypertensives were analysed. Th
Publicado em: 2003
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12. Atividade eletromiografica do musculo vasto medial obliquo em exercicios isometricos e isotonicos das articulações do quadril e do joelho
The purpose of this study was to analyse electromyographicaly the activity of the vastus medialis oblique during exercises which are usually advice in physical therapy, mainly to those with patellofemoral dysfunction. Using an 8 channels Nicolet electromyograph and Beckman surface mini electrodes, the electrical activity was recorded during exercises as foll
Publicado em: 1995