Relationship between Peak Torque, Work, and Power for Knee Flexion and Extension in Clients with Grade I Medial Compartment Sprains of the Knee

Purpose: The aim of this study is to determine the isokinetic muscle strength profile of knee flexor and extensor muscles of visually impaired long distance running athletes and compare them with the literature.Methods: The study consisted of 7 male visually impaired long distance running athletes aged between 19-28 (means 24,14±3,23), who complied with the criteria and voluntarily participated in the study. İsokinetic measurement was performed with Isomed 2000® device. İn isokinetic evaluation, maximal muscle strength, muscle strength ratios, percentage of right-left strength difference ratio of knee flexors and extensors were recorded. İsokinetic testing protocol; before the test all athletes performed the knee flexion and extension isokinetic test with the 5 repeating at 90 º/sec as a warm-up and for comprehenting the test. Then, knee flexion and extension concentric-concentric strength measurements were performed with the 5 repeating at 60 º/sec and with the 15 repeating at 180 º/sec with the angle between 90 degrees of knee flexion and 10 degrees of knee extension. The evaluations were performed bilaterally, first dominant side and after 3 minutes non dominant side was evaluated.Results: The H / Q peak torque ratio of the athletes is 53.55% for the dominant side and 55.47% for the non-dominant side at 60º / sec. velocity while 59.05% for the dominant side and 61.34% for the non-dominant side at 180º / sec. velocity. When the H / Q peak torque ratio of the athletes was compared between dominant and non-dominant sides, there was no difference in both angular velocities (p>0.05). Knee flexion and extension isokinetic muscle strength’s difference were determined lower than %10 for both angular angles when compared to the asymmetry of the right and left extremities. It was found that this was in accordance with the literature and there was no asymmetry between the right and left sides.Conclusion: In visually impaired long distance runners, having H/Q ratio lower than normal borders against knee flexors for both sides at 180°/sec. angular velocity poses a risk for injuries. In terms of prevention of sports injuries, it is necessary for the athletes to maintain muscle force balance which is specific to each angular velocity and to exercise with sports-specific exercises.Extended English abstract is in the end of PDF (TURKISH) file.ÖzetAmaç: Bu çalışmanın amacı görme engelli uzun mesafe atletizm sporcularının diz fleksör ve ekstansör kaslarının izokinetik kas kuvvet profilini belirlemek ve literatürdeki bilgilerle karşılaştırmaktır.Method: Çalışmamıza; 19-28 (Ort. 24,14±3,23) yaş aralığında 7 erkek görme engelli uzun mesafe atletizm sporcusu dâhil edildi. İzokinetik kas kuvveti Isomed 2000® cihazı ile değerlendirildi. İzokinetik değerlendirmede diz fleksör ve ekstansörlerinin maksimum kas kuvveti, kas kuvvet oranları, sağ-sol kuvvet farkı oranı yüzdesi kaydedildi. Değerlendirmede 90-10 º fleksiyon açılarında konsantrik-konsantrik kuvvet ölçümü yapıldı. İzokinetik test protokolü olarak; 5 tekrarlı 90º/sn. hızla testi anlama ve submaksimal ısınma hareketinden sonra, 5 tekrarlı 60º/sn. hızla ve 15 tekrarlı 180º/sn. hızla maksimal diz fleksiyon ve ekstansiyon hareketleri yaptırıldı. Değerlendirmeler bilateral olarak gerçekleştirildi ve öncelikle dominant taraf, 3 dk sonra non-dominant taraf değerlendirildi.Bulgular: Sporcuların H/Q peak tork oranı 60º/sn. hızda dominant taraf için % 53.55, non-dominant taraf için % 55.47 bulunurken 180º/sn. hızda dominant taraf için % 59.05, non-dominant taraf için % 61.34 bulundu. H/Q peak tork oranı dominant ve non-dominant taraf arasında karşılaştırıldığında her iki açısal hızda da farklılık bulunmadı (p>0,05). Sağ ve sol ekstremiteler asimetri açısından karşılaştırıldığında diz fleksiyon ve ekstansiyon izokinetik kas kuvveti farkının her iki açısal hızda da %10 un altında olduğu belirlendi. Bu durumun literatür ile uyumlu olduğu ve sağ-sol taraf arasında bir asimetri olmadığı sonucuna varıldı.Sonuç: Çalışmamız sonucunda Görme engelli uzun mesafe koşucularında 180º/sn. açısal hızda H/Q oranının normal sınırlardan daha düşük ve her iki tarafta diz fleksörleri aleyhinde olması yaralanma açısından risk oluşturmaktadır. Spor yaralanmalarının önlenmesi açısından sporcuların her açısal hıza özgü olan kas kuvvet dengesinin korunması ve spora özgü egzersizlerle çalıştırılması gereklidir.

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Isokinetic Leg Strength and Power in Elite Handball Players

Journal of Human Kinetics ◽

10.2478/hukin-2014-0050 ◽

2014 ◽

Vol 41 (1) ◽

pp. 227-233 ◽

Cited By ~ 12

Author(s):

José M. González-Ravé ◽

Daniel Juárez ◽

Jacobo A. Rubio-Arias ◽

Vicente J Clemente-Suarez ◽

María A Martinez-Valencia ◽

...

Keyword(s):

Knee Flexion ◽

Vertical Jump ◽

Body Height ◽

Knee Extensor ◽

Peak Torque ◽

Isokinetic Strength ◽

Flexor Muscle ◽

Jumping Performance ◽

Vertical Jumping ◽

Flexion And Extension

AbstractIsokinetic strength evaluation of the knee flexion and extension in concentric mode of contraction is an important part of the comprehensive evaluation of athletes. The aims of this study were to evaluate the isokinetic knee peak torque in both the extension and flexion movement in the dominant and non-dominant leg, and the relationship with jumping performance. Twelve elite male handball players from the top Spanish handball division voluntary participated in the study (age 27.68 ± 4.12 years; body mass 92.89 ± 12.34 kg; body height 1.90 ± 0.05 m). The knee extensor and flexor muscle peak torque of each leg were concentrically measured at 60°/s and 180°/s with an isokinetic dynamometer. The Squat Jump and Countermovement Jump were performed on a force platform to determine power and vertical jump height. Non-significant differences were observed between legs in the isokinetic knee extension (dominant= 2.91 ± 0.53 Nm/kg vs non-dominant = 2.70 ± 0.47 Nm/kg at 60°/s; dominant = 1.90 ± 0.31 Nm/kg vs non-dominant = 1.83 ± 0.29 Nm/kg at 180°/s) and flexion peak torques (dominant = 1.76 ± 0.29 Nm/kg vs non-dominant = 1.72 ± 0.39 Nm/kg at 60°/s; dominant = 1.30 ± 0.23 Nm/kg vs non-dominant = 1.27 ± 0.35 Nm/kg at 180°/s). Low and non-significant correlation coefficients were found between the isokinetic peak torques and vertical jumping performance (SJ = 31.21 ± 4.32 cm; CMJ = 35.89 ± 4.20 cm). Similar isokinetic strength was observed between the legs; therefore, no relationship was found between the isokinetic knee flexion and extension peak torques as well as vertical jumping performance in elite handball players.

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Intra- and Inter-Rater Reliability of a Well-Used and a Less-Used IsoMed 2000 Dynamometer for Knee Flexion and Extension Peak Torque Measurements in a Concentric Test in Athletes

Applied Sciences ◽

10.3390/app11114951 ◽

2021 ◽

Vol 11 (11) ◽

pp. 4951

Author(s):

Tuğba Kocahan ◽

Bihter Akınoğlu ◽

Ayfer Ezgi Yilmaz ◽

Thomas Rosemann ◽

Beat Knechtle

Keyword(s):

Muscle Strength ◽

Knee Flexion ◽

Peak Torque ◽

Weight Lifting ◽

Strength Parameters ◽

Limits Of Agreement ◽

Rater Reliability ◽

Knee Muscle ◽

Knee Muscle Strength ◽

Flexion And Extension

This study aimed to evaluate the intra- and inter-rater reliability of a well-used and a less-used IsoMed-2000 dynamometer for knee flexion and extension peak torque (PT) measurements in a concentric test in athletes. Two IsoMed-2000 isokinetic dynamometers were used, an old one that was well-used and a new one that was less-used. Thirty-seven weight-lifting athletes (12 female, 25 male) were included in this study. Both legs of each athlete were tested twice on each isokinetic dynamometer at 60°/s and 180°/s. The Intraclass Correlation Coefficients (ICC), Standard Error Measurement (SEM), Smallest Detectable Change (SDC), SDC% and 95% limits of agreement were calculated to evaluate the intra- and inter-rater reliability of a well-used and a less-used IsoMed 2000 dynamometer for knee flexion and extension peak torque in athletes. Intra-rater reliability was moderate to excellent (ICCs: 0.516–0.928) for knee muscle strength parameters, and the highest SDC and SEM values were 0.76 N/kg and 0.28 N/kg, respectively. Inter-rater reliability was moderate to excellent (ICCs: 0.519–915) for knee muscle strength parameters, and the highest SDC and SEM values were 0.81 N/kg and 0.29 N/kg, respectively. At least 89.2% of the obtained values of parameters fell within the 95% limits of agreement. Our findings demonstrate the intra and inter-rater reliability of a Well-Used and a Less-Used IsoMed 2000 Dynamometer for Knee Flexion and Extension Peak Torque in Athletes.

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Differences in knee flexion and extension angles of peak torque between men and women

Isokinetics and Exercise Science ◽

10.3233/ies-2012-0443 ◽

2012 ◽

Vol 20 (2) ◽

pp. 71-76 ◽

Cited By ~ 2

Author(s):

Leon Lategan

Keyword(s):

Knee Flexion ◽

Peak Torque ◽

Men And Women ◽

Flexion And Extension

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Force Sense of the Knee Not Affected by Fatiguing the Knee Extensors and Flexors

Journal of Sport Rehabilitation ◽

10.1123/jsr.2014-0298 ◽

2016 ◽

Vol 25 (2) ◽

pp. 155-163 ◽

Cited By ~ 3

Author(s):

Katelyn F. Allison ◽

Timothy C. Sell ◽

Anne Benjaminse ◽

Scott M. Lephart

Keyword(s):

Outcome Measures ◽

Knee Flexion ◽

Knee Injuries ◽

Neuromuscular Control ◽

Peak Torque ◽

Peripheral Fatigue ◽

Knee Extensors ◽

Median Frequency ◽

Force Sense ◽

Flexion And Extension

Context:Knee injuries commonly occur in later stages of competition, indicating that fatigue may influence dynamic knee stability. Force sense (FS) is a submodality of proprioception influenced by muscle mechanoreceptors, which, if negatively affected by fatigue, may result in less-effective neuromuscular control.Objectives:To determine the effects of peripheral fatigue on FS of the quadriceps and hamstrings.Design:Quasi-experimental study design.Participants:20 healthy and physically active women and men (age 23.4 ± 2.7 y, mass 69.5 ± 10.9 kg, height 169.7 ± 9.4 cm).Interventions:Fatigue was induced during a protocol with 2 sets of 40 repetitions, and the last set was truncated at 90 repetitions or stopped if torque production dropped below 25% of peak torque.Main Outcome Measures:FS of the hamstrings and quadriceps was tested on separate days before and after 3 sets of isokinetic knee flexion and extension to fatigue by examining the ability to produce a target isometric torque (15% MVIC) with and without visual feedback (FS error). Electromyographic data of the tested musculature were collected to calculate and determine median frequency shift. T tests and Wilcoxon signed-rank tests were conducted to examine prefatigue and postfatigue FS error for flexion and extension.Results:Despite verification of fatigue via torque-production decrement and shift in median frequency, no significant differences were observed in FS error for either knee flexion (pre 0.54 ± 2.28 N•m, post 0.47 ± 1.62 N•m) or extension (pre –0.28 ± 2.69 N•m, post –0.21 ± 1.78 N•m) prefatigue compared with the postfatigue condition.Conclusions:Although previous research has demonstrated that peripheral fatigue negatively affects threshold to detect passive motion (TTDPM), it did not affect FS as measured in this study. The peripheral-fatigue protocol may have a greater effect on the mechanoreceptors responsible for TTDPM than those responsible for FS. Further investigation into the effects of fatigue across various modes of proprioception is warranted.

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COMPARAÇÃO DO PICO DE TORQUE ISOCINÉTICO CONCÊNTRICO EM INDIVÍDUOS ATIVOS COM E SEM A APLICAÇÃO DE BANDAGEM ELÁSTICA FUNCIONAL

Manual Therapy Posturology & Rehabilitation Journal ◽

10.17784/mtprehabjournal.2015.13.270 ◽

2015 ◽

Vol 13 ◽

pp. 270

Author(s):

Jéssica Kirsch Micheletti ◽

Sérgio Luiz Rodrigues De Souza ◽

Ana Flávia Spadaccini Silva ◽

Rinaldo Bernardelli Junior ◽

Berlis Ribeiro dos Santos Menossi

Keyword(s):

Muscle Function ◽

Knee Flexion ◽

Functional Performance ◽

Peak Torque ◽

Muscle Performance ◽

Isokinetic Dynamometer ◽

Physically Active ◽

Kinesio Taping ◽

Isokinetic Evaluation ◽

Flexion And Extension

Introduction: Physically active individuals constantly seek resources that can improve their muscle performance, avoid the appearance of lesions and even relapses. Kinesio Taping has been used for both treatment/prevention of injury and to improve functional performance. The isokinetic dynamometer enables rapid quantitative analysis of many parameters of muscle function, being the peak torque the most representative in research and clinical practice. Objective: To compare the concentric peak torque isokinetic in active individuals with and without the application of kinesio taping. Method: 10 male volunteers were evaluated and submitted to the IPAQ questionnaire, where they were considered actives. Then, were realized isokinetic evaluations into steps: Phase Control (without application of elastic taping) and Phase Bandage (with application of placebo and original bandage). The same protocol isokinetic repetitions of 5 to 60 ° / s knee flexion and extension was adopted in all the stages for the reliability and reproducibility of the data. Results: The application of taping in physically active individuals in isokinetic evaluation did not increase the concentric peak torque at 60 °/s. Conclusion: Was observed reliability and reproducibility of the results, however, no significant differences were observed in concentric peak torque isokinetic of the quadriceps of active individuals with and without the application of the original kinesio taping and placebo.

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Physical Fitness of Trained Runners with and without Mild Mental Retardation

Adapted Physical Activity Quarterly ◽

10.1123/apaq.16.2.126 ◽

1999 ◽

Vol 16 (2) ◽

pp. 126-137 ◽

Cited By ~ 19

Author(s):

Georgia C. Frey ◽

Jeffrey A. McCubbin ◽

Steve Hannigan-Downs ◽

Susan L Kasser ◽

Steven O. Skaggs

Keyword(s):

Mental Retardation ◽

Physical Fitness ◽

Body Fat ◽

Knee Flexion ◽

Peak Torque ◽

Percent Body Fat ◽

Mild Mental Retardation ◽

Lower Back ◽

Hamstring Flexibility ◽

Trained Runners

The purpose of this study was to compare physical fitness levels of trained runners with mild mental retardation (MMR) (7 males and 2 females, age = 28.7 ± 7.4 years, weight = 67.0 ± 11.7 kg) and those without (7 males and 2 females, age = 29.1 ± 7.5, weight = 68.7 ± 8.8 kg). Paired t tests revealed no differences between runners with and without MMR on measures of V̇O2peak (56.3 ± 9.1 vs. 57.7 ± 4.1 ml · kg-1 · min-1), percent body fat (16.6 ± 8.4 vs. 16.6 ± 3.1), and lower back/hamstring flexibility (33.1 ± 10.9 vs. 28.6 ± 10.1 cm). Knee flexion (KF) and extension (KE) strength were significantly greater in runners without MMR compared to those with MMR (KF peak torque = 65.7 ±7.9 vs. 48.7 ± 15.7 ft/lb; KE peak torque = 138.5 ± 17.7 vs. 104.4 ± 29.9 ft/lb). It was concluded that trained runners with MMR can achieve high levels of physical fitness comparable to individuals without MMR.

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