Heavy-intensity aerobic exercise affects the isokinetic torque and functional but not conventional hamstrings:quadriceps ratios

Oliveira, Anderson Souza; Caputo, Fabrízio; Gonçalves, Mauro; Denadai, Benedito Sérgio

doi:10.1016/j.jelekin.2008.10.005

Cited by 21 publications

(15 citation statements)

References 28 publications

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“…Recent studies have assessed EMG activity during maximal contractions at short RoMs [9,10], which include the range corresponding to the optimal lengthtension relationship (i.e., the range that includes the angle of peak torque). Sports performance and rehabilitation research could be benefited by using shorter RoMs to evaluate maximal parameters, since knee joint disorders may affect afferent information, especially in the range of the injury [8].…”

Section: Human Movementmentioning

confidence: 99%

Maximal isokinetic peak torque and emg activity determined by shorter ranges of motion

Oliveira¹,

Corvino²,

Gonçalves³

et al. 2018

Hum Mov.

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Purpose. Isokinetic tests are often applied to assess muscular strength and EMG activity, however the specific ranges of motion used in testing (fully flexed or extended positions) might be constrictive and/or be painful for patients with injuries or undergoing rehabilitation. The aim of this study was to examine the effects of different ranges of motion (RoM) when determining maximal EMG during isokinetic knee flexion and extension with different types of contractions and velocities. Methods. Eighteen males had EMG activity recorded on the vastus lateralis, vastus medialis, semitendinosus and biceps femoris muscles during five maximal isokinetic concentric and eccentric contractions for the knee flexors and extensors at 60° · s -1 and 180° · s -1. The root mean square of EMG was calculated at three different ranges of motion: (1) a full range of motion (90°-20° [0° = full knee extension]); (2) a range of motion of 20° (between 60°-80° and 40°-60° for knee extension and flexion, respectively) and (3) at a 10° interval around the angle where peak torque is produced. EMG measurements were statistically analyzed (ANOVA) to test for the range of motion, contraction velocity and contraction speed effects. Coefficients of variation and Pearson's correlation coefficients were also calculated among the ranges of motion. Results. Predominantly similar (p > 0.05) and well-correlated EMG results (r > 0.7, p 0.001) were found among the ranges of motion. However, a lower coefficient of variation was found for the full range of motion, while the 10° interval around peak torque at 180° · s -1 had the highest coefficient, regardless of the type of contraction. Conclusions. Shorter ranges of motion at around the peak torque angle provides a reliable indicator when recording EMG activity during maximal isokinetic parameters. It may provide a safer alternative when testing patients with injuries or undergoing rehabilitation.

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Section: Human Movementmentioning

confidence: 99%

Maximal isokinetic peak torque and emg activity determined by shorter ranges of motion

Oliveira¹,

Corvino²,

Gonçalves³

et al. 2018

Hum Mov.

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“…Most studies divide the velocity specific eccentric peak torque value for the hamstrings by the concentric peak torque value for the quadriceps [8][9][10][11].…”

Section: The Functional Ratio (H/q Func ) (Eccentric Hamstrings / Conmentioning

confidence: 99%

“…A number of studies have examined changes in the H/Q FUNC with increasing velocity and as peak torque has been used to calculate the H/Q FUNC most studies have demonstrated a significant increase in the ratio with increasing velocity [7,10,16]. This is attributed to the decrease in concentric force production with increasing velocity compared to the plateauing of torque production with increasing velocity during eccentric actions.…”

Section: The Functional Ratio (H/q Func ) (Eccentric Hamstrings / Conmentioning

confidence: 99%

The impact of joint angle and movement velocity on sex differences in the functional hamstring/quadriceps ratio

Croix

Elnagar

Iga³

et al. 2017

The Knee

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DisclaimerThe University of Gloucestershire has obtained warranties from all depositors as to their title in the material deposited and as to their right to deposit such material.The University of Gloucestershire makes no representation or warranties of commercial utility, title, or fitness for a particular purpose or any other warranty, express or implied in respect of any material deposited.The University of Gloucestershire makes no representation that the use of the materials will not infringe any patent, copyright, trademark or other property or proprietary rights.The University of Gloucestershire accepts no liability for any infringement of intellectual property rights in any material deposited but will remove such material from public view pending investigation in the event of an allegation of any such infringement. PLEASE SCROLL DOWN FOR TEXT. 1The impact of joint angle and movement velocity on sex differences in the functional hamstring/quadriceps ratio AbstractObjective: Females are 2-8 times more likely to suffer a non-contact injury compared with males thus the purpose of this study was to explore the influence of joint angle and movement velocity on sex differences in the functional hamstring to quadriceps ratio (H/Q FUNC ).Methods: Isokinetic concentric and eccentric torque were determined in 110 participants (55 males and 55 females) through a 90° range of movement at 60, 120, 240°/s. Testing was performed with the hip flexed at 10°. The H/Q FUNC was determined at 3 specific joint angles (15, 30 and 45° flexion) and where peak torque occurred for concentric knee extension.Results: A significant interaction effect (P <0.01) for sex and joint angle was observed with women demonstrating a lower H/Q FUNC than males, especially at more extended knee positions. A significant sex by velocity interaction (P <0.01) indicated a lower H/Q FUNC in women as velocity increased. Significant main effects (P < 0.01) indicated that irrespective of sex the H/Q FUNC increased as the knee extends and velocity increases. Conclusion:Given the reduced H/Q FUNC in females compared to males at more extended knee positions and faster velocities, this may contribute to the observed sex bias in reported injury rates.

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“…Oliveira et al (2008) realizaram um estudo em não-atletas, medindo o PT concêntrico e excêntrico dos flexores e extensores de joelho, antes e após exercícios contínuos de corrida. Eles observaram que a razão convencional permaneceu a mesma após o exercício, porém a razão funcional diminuiu significativamente após a corrida.…”

Section: Protocolos De Avaliação Isocinética De Fadigaunclassified

Avaliação isocinética da fadiga em jogadores de futebol profissional

Weber¹,

Silva²,

Cadore³

et al. 2012

Rev. Bras. Ciênc. Esporte

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Heavy-intensity aerobic exercise affects the isokinetic torque and functional but not conventional hamstrings:quadriceps ratios

Cited by 21 publications

References 28 publications

Maximal isokinetic peak torque and emg activity determined by shorter ranges of motion

Maximal isokinetic peak torque and emg activity determined by shorter ranges of motion

The impact of joint angle and movement velocity on sex differences in the functional hamstring/quadriceps ratio

Avaliação isocinética da fadiga em jogadores de futebol profissional

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