Isometric and isokinetic torque curves at the knee joint

Yoon, Tae Sik; Park, Dong Sik; Kang, Seung Woong; Chun, Sae Il; Shin, Jung Soon

doi:10.3349/ymj.1991.32.1.33

Cited by 46 publications

(30 citation statements)

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“…The torque-angle curves from our control subjects had similar shapes as reported previously for healthy adults with a quasi-bell-shaped curve for the knee extensors and torque that increased with longer muscle lengths for the knee flexors [15, 16]. …”

Section: Discussionsupporting

confidence: 58%

Nonuniform Weakness in the Paretic Knee and Compensatory Strength Gains in the Nonparetic Knee Occurs after Stroke

Lomaglio

Eng²

2008

Cerebrovasc Dis

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Background: This study was designed to quantify torque production at different joint angles in the paretic and nonparetic knee joints of individuals with stroke. Methods: Extension and flexion torques were measured at 6 angles of the knee joint and normalized to peak torque in 19 subjects with stroke and 19 controls. Results: Paretic knee extension torque was lower than controls when the knee was positioned near extension. In contrast, nonparetic knee extension and flexion torques were higher than controls when the knee was positioned near full flexion. Conclusions: The paretic knee extensors demonstrated exaggerated weakness at short muscle lengths and the nonparetic knee extensors and flexors demonstrated selective strength gains. Clinicians should therefore consider paretic knee extensor strengthening near full extension and promote symmetrical use of the legs to prevent compensatory overuse of the nonparetic leg.

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Section: Discussionsupporting

confidence: 58%

Nonuniform Weakness in the Paretic Knee and Compensatory Strength Gains in the Nonparetic Knee Occurs after Stroke

Lomaglio

Eng²

2008

Cerebrovasc Dis

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“…The findings of current study support previous observations which have reported a higher H/Q FUNC ratio in males compared with females [21,26,27]. This may be due to the proposed quadriceps dominance seen in females quadriceps and/or lower eccentric hamstring torque generating capability compared with males.…”

Section: Discussionsupporting

confidence: 90%

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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“…The subject was asked to relax his leg so that the passive determination of the effects of gravity on the limb and lever arm could be carried out. The MVC were determined for the knee extensors (m. quadriceps femoris) at a static knee joint angle of 60°(0°= full extension), that is, the angle at which maximal isometric torque is attained (33). Two maximal isometric attempts were performed with rest periods of 60 seconds in between.…”

Section: Experimental Designmentioning

confidence: 99%

The Rate of Force Development Obtained at Early Contraction Phase Is Not Influenced by Active Static Stretching

Oliveira

Greco

Molina

et al. 2012

Journal of Strength and Conditioning Research

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The objective of this study was to investigate the influence of active static stretching on the maximal isometric muscle strength (maximal voluntary contraction [MVC]) and rate of force development (RFD) determined within time intervals of 30, 50, 100, and 200 milliseconds relative to the onset of muscle contraction. Fifteen men (aged 21.3 ± 2.4 years) were submitted on different days to the following tests: (a) familiarization session to the isokinetic dynamometer; (b) 2 maximal isometric contractions for knee extensors in the isokinetic dynamometer to determine MVC and RFD (control); and (c) 2 active static stretching exercises for the dominant leg extensors (10 × 30 seconds for each exercise with a 20-second rest interval between bouts). After stretching, the isokinetic test was repeated (poststretching). Conditions 2 and 3 were performed in random order. The RFD was considered as the mean slope of the moment-time curve at time intervals of 0-30, 0-50, 0-100; 0-150; and 0200 milliseconds relative to the onset of muscle contraction. The MVC was reduced after stretching (285 ± 59 vs. 271 ± 56 N · m, p < 0.01). The RFD at intervals of 0-30, 0-50, and 0-100 milliseconds was unchanged after stretching (p > 0.05). However, the RFD measured at intervals of 0-150 and 0-200 milliseconds was significantly lower after stretching (p < 0.01). It can be concluded that explosive muscular actions of a very short duration (<100 milliseconds) seem less affected by active static stretching when compared with actions using maximal muscle strength.

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Isometric and isokinetic torque curves at the knee joint

Cited by 46 publications

References 0 publications

Nonuniform Weakness in the Paretic Knee and Compensatory Strength Gains in the Nonparetic Knee Occurs after Stroke

Nonuniform Weakness in the Paretic Knee and Compensatory Strength Gains in the Nonparetic Knee Occurs after Stroke

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

The Rate of Force Development Obtained at Early Contraction Phase Is Not Influenced by Active Static Stretching

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