Reprodutibilidade inter e intradias do Power Control em um teste de potência muscular

Ribeiro, Fabrício Miranda; Lemos, Adriana; Simão, Roberto

doi:10.1590/s1517-86922006000500006

Cited by 2 publications

(3 citation statements)

References 14 publications

(21 reference statements)

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“…A low value can indicate that the muscle function is clinically altered and that the energy expenditure during a range of motion is not adequate or has muscle defi cit. 12,32 On the other hand, muscle power expressed in Watts (W) represents total work divided by contraction time, that is, energy expenditure during a contraction over a certain time. It clinically represents the amount of energy that the muscle can waste over a shorter time to generate torque, and can be altered due to some muscle functional defi cit.…”

Section: Discussionmentioning

confidence: 99%

“…It clinically represents the amount of energy that the muscle can waste over a shorter time to generate torque, and can be altered due to some muscle functional defi cit. 12,32 Because knee OA causes a reduction in muscle mass due to refl ex muscle inhibition resulting from pain, 10,14 and TKA is aimed at reverting the effects of pain by removing the tissues degenerated by OA, 20,27 the TKA group was expected to show higher muscle work and power as compared with those of the OA group. However, the results showed no difference between the groups at the angular velocities assessed for both the knee extensor and fl exor muscles.…”

Section: Discussionmentioning

confidence: 99%

“…The exclusion criteria were as follows: previous history of hip joint surgery and/or revision knee surgery; severe pain assessed by use of the visual analogue scale of pain (VASP); limitation of range of motion of the knee; and cardiac, neurological, musculoskeletal, and metabolic changes that hindered the execution of maximal voluntary contraction tests. 32 The Humac ® recommendations were also respected. 33 Participants were assessed regarding their functionality degree (Western Ontario and McMaster Universities Osteoarthritis Index -WOMAC Index) 34,35 and pain intensity (VASP).…”

Section: Samplementioning

confidence: 99%

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Trabalho e potência dos músculos extensores e flexores do joelho de pacientes com osteoartrite e com artroplastia total de joelho

Bastiani¹,

Ritzel²,

Bortoluzzi³

et al. 2012

Rev. Bras. Reumatol.

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Introduction: The infl ammatory manifestations of knee osteoarthritis (OA) lead to muscle inhibition and hypotrophy, resulting in a reduction in total muscle work and muscle power. Total knee arthroplasty (TKA) is the most adequate surgery for the treatment of advanced OA. However, its effects on muscle functional behavior have not been well understood. Objective: To compare the total work and power of the knee fl exor and extensor muscles in patients with OA (20) and in patients post-TKA (12) at two angular velocities (60°/sec and 240°/sec). Methods: An isokinetic Biodex dynamometer was used to assess muscle power and total work during isokinetic contractions. Two-way ANOVA for repeated measures was used to compare total muscle work and muscle power between the groups (SPSS software, version 13.0; signifi cance level, P < 0.05). Results: There was no difference between the OA and TKA groups for the total work of both knee extensors and fl exors at the two angular velocities (P ≥ 0.05). In addition, no difference was observed in the muscle power of the knee extensors and fl exors (P ≥ 0.05). Conclusion: Total work and power were similar in the OA and TKA groups, suggesting that TKA did not improve functional capacity, which was similar in both groups.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Samplementioning

confidence: 99%

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Trabalho e potência dos músculos extensores e flexores do joelho de pacientes com osteoartrite e com artroplastia total de joelho

Bastiani¹,

Ritzel²,

Bortoluzzi³

et al. 2012

Rev. Bras. Reumatol.

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Influência do nível de força máxima na produção e manutenção da potência muscular

Paulo

Tavares

Cardoso

et al. 2010

Rev Bras Med Esporte

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RESUMOIndivíduos mais fortes (com nível mais elevado de força máxima, F max ) demonstram menor resistência de força que indivíduos mais fracos (com nível mais baixo de F max ) em uma mesma intensidade relativa. Como o nível de F max influencia a produção de potência, espera-se que sujeitos mais fortes também apresentem uma menor resistência de potência. O objetivo deste estudo foi avaliar a influência do nível de F max na produção e na resistência de potência durante repetições e séries múltiplas do exercício meio-agachamento. Quarenta e dois sujeitos foram classificados de acordo com o resultado no teste de força dinâmica máxima (1RM) e destes os 10 mais fortes e os 10 mais fracos foram selecionados para participar no estudo. Para avaliar a resistência de potência os dois grupos realizaram 10 séries de seis repetições a 40% e a 60% 1RM na maior velocidade possível. A potência absoluta (PA) e a potência relativa ao peso corporal (PR) desenvolvidas na fase concêntrica do exercício foram medidas. A análise de variância (ANOVA two-way) revelou que os sujeitos mais fortes diminuíram a PA a 60% 1RM a partir da quarta repetição e a PR a partir da quinta repetição. Já os sujeitos mais fracos diminuíram a PA apenas na sexta repetição e mantiveram o rendimento na PR ao longo das 10 séries. Não houve efeito significante na intensidade de 40% 1RM. Isso sugere que sujeitos mais fortes fadigam antes em maiores intensidades de carga. Essa fadiga precoce nos sujeitos mais fortes poderia estar ligada a diferentes fatores associados ao controle da homeostase orgânica como o comportamento da pressão arterial, da atividade eletromiográfica e a proporção de fibras musculares dos tipos I e II.Palavras-chave: fadiga, carga de treinamento, atividade intermitente. ABSTRACTIt seems that stronger subjects present less strength endurance compared to weaker subjects at the same relative intensity. Since the level of maximum strength affects power production, it is also expected that stronger subjects present lower power endurance. The aim of this study was to evaluate the effects of maximum strength on power production and endurance over multiple sets and repetitions of the half-squat exercise. Forty-two subjects were classified according to the result in the 1RM test and the 10 strongest and 10 weakest were selected to participate. In order to evaluate power endurance, both groups performed 10 sets of 6 repetitions at 40% and 60% 1RM as fast as possible. The absolute power (AP) and relative power (RP) (corrected by body weight) developed in half-squat concentric phase were measured. Analysis of variance for repeated measures (Two-Way ANOVA) revealed that the stronger subjects decreased AP from 4th repetition on and RP from 5th repetition on at 60% 1RM. The weakest subjects decreased AP from 6th repetition on and maintained RP production over the ten series. There was no significant effect on 40% 1RM. This result suggests that stronger subjects fatigue first at higher intensities. The early fatigue in stronger subjects could be associated ...

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Reprodutibilidade inter e intradias do Power Control em um teste de potência muscular

Cited by 2 publications

References 14 publications

Trabalho e potência dos músculos extensores e flexores do joelho de pacientes com osteoartrite e com artroplastia total de joelho

Trabalho e potência dos músculos extensores e flexores do joelho de pacientes com osteoartrite e com artroplastia total de joelho

Influência do nível de força máxima na produção e manutenção da potência muscular

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