Navegando por Palavras-chave "Muscle strength dynamometer"
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- ItemSomente MetadadadosEfeitos da terapia laser de baixa intensidade no desempenho muscular isocinético em mulheres idosas(Universidade Federal de São Paulo (UNIFESP), 2015-03-16) Alves, Patricia Gabrielli Vassao [UNIFESP]; Renno, Ana Claudia Muniz [UNIFESP]; http://lattes.cnpq.br/4106611304688552; Universidade Federal de São Paulo (UNIFESP)Aging involves several changes in body that lead to decline of muscle function, particularly in females. This functional reserve reduction predisposes the musculoskeletal system to the development of muscle fatigue. In this context, low-level laser therapy (LLLT) demonstrate to be an important resource in attenuation of muscle fatigue. Thus, the objective of this study was to analyze the influence of LLLT in fatigue and muscle performance in elderly women submitted to an isokinetic fatigue protocol. For this, 30 women, between 60 and 70 years, were randomized and submitted to two experimental sessions of fatigue protocol. By the simple drawing of lots into two groups: laser placebo (n = 30) and active laser (n = 30). In both sessions, peripheral muscle fatigue was analyzed by surface electromyography (EMG) and collection of blood samples. The muscle performance was evaluated using the isokinetic dynamometer. The LLLT was previously applied to the isokinetic fatigue protocol over the rectus femoris muscle of the dominant limb. To compare the groups, we used the analysis of variance (ANOVA) for repeated measures for experiments in crossover and the Tukey?s method of multiple comparison. The results showed that LLLT was able to reduce muscle fatigue by a significant increase of the electromyographic fatigue index (EFI) (p = 0.047) and attenuation lactate concentration at time 6 minutes after the fatigue test (p = 0. 0006) compared the laser sessions placebo. However, LLLT was not able to increase muscle performance measured by the variables of the isokinetic dynamometer. Thus, can be conclude that the acute effect of LLLT was effective in increase the IFE and reduce lactate concentration 6 minutes after the fatigue protocol when previously applied to execution of the exercise.
- ItemSomente MetadadadosEffects of photobiomodulation on the fatigue level in elderly women: an isokinetic dynamometry evaluation(Springer London Ltd, 2016) Vassão, Patricia Gabrielli [UNIFESP]; Toma, Renata Luri [UNIFESP]; Antunes, Hanna Karen Moreira [UNIFESP]; Tucci, Helga Tatiana [UNIFESP]; Renno, Ana Claudia Muniz [UNIFESP]Aging is responsible by a series of morphological and functional modifications that lead to a decline of muscle function, particularly in females. Muscle tissue in elderly people is more susceptible to fatigue and, consequently, to an increased inability to maintain strength and motor control. In this context, therapeutic approaches able of attenuating muscle fatigue have been investigated. Among these, the photobiomodulation demonstrate positive results to interacts with biological tissues, promoting the increase in cell energy production. Thus, the aim of this study was to investigate the effects of photobiomodulation (808 nm, 250 J/cm(2), 100 mW, 7 J each point) in the fatigue level and muscle performance in elderly women. Thirty subjects entered a crossover randomized double-blinded placebo-controlled trial. Photobiomodulation was delivered on the rectus femoris muscle of the dominant limb immediately before the fatigue protocol. In both sessions, peripheral muscle fatigue was analyzed by surface electromyography (EMG) and blood lactate analysis. Muscle performance was evaluated using an isokinetic dynamometer. The results showed that photobiomodulation was able of reducing muscle fatigue by a significant increase of electromyographic fatigue index (EFI) (p = 0.047) and decreasing significantly lactate concentration 6 min after the performance of the fatigue protocol (p = 0. 0006) compared the placebo laser session. However, the photobiomodulation was not able of increasing muscle performance measured by the isokinetic dynamometer. Thus, it can be conclude that the photobiomodulation was effective in reducing fatigue levels. However, no effects of photobiomodulation on muscle performance was observed.
- ItemSomente MetadadadosProfile of isokinetic eccentric-to-concentric strength ratios of shoulder rotator muscles in elite female team handball players(Taylor & Francis Ltd, 2010-01-01) Andrade, Marilia Dos Santos [UNIFESP]; Fleury, Anna Maria [UNIFESP]; Barbosia de Lira, Claudio Andre; Dubas, Joao Paulo [UNIFESP]; Silva, Antonio Carlos da [UNIFESP]; Universidade Federal de São Paulo (UNIFESP); Universidade Federal de Goiás (UFG)The purpose of this study was to establish the isokinetic profile of shoulder rotator muscles strength in female handball players. Twenty-seven handball players performed concentric and eccentric strength tests of both dominant and non-dominant upper limbs on an isokinetic dynamometer. Internal and external rotator muscles peak torque was assessed at 1.05, 3.14, and 5.23 rad center dot s-1 in concentric mode and at 3.14 and 5.23 rad center dot s-1 in eccentric mode. Concentric balance ratio and functional ratio were obtained. Bi-lateral deficiency was compared. Concentric strength for internal and external rotation was significantly greater for the dominant than for the non-dominant limb for all speeds (P0.0001). for eccentric actions, internal rotator muscles were stronger in the dominant than the non-dominant limb (P0.0001) at both speeds. Concentric balance and functional balance ratios did not differ between sides at 3.14 rad center dot s-1 (P=0.1631), but at 5.23 rad center dot s-1 the functional balance ratio in the dominant limb was lower than for the non-dominant limb (P=0.0500). Although the dominant side was stronger than the non-dominant side, balance concentric ratios remained the same, with only the functional strength ratio different at 5.23 rad center dot s-1. Our results suggest that concentric strength exercises be used for internal and external rotators on the non-dominant side, and functional exercise that improves eccentric rotation strength for prevention programmes.