Time of day effect on isokinetic peak torque during knee flexion and extension

2016 ◽  
Vol 24 (4) ◽  
pp. 285-293 ◽  
Author(s):  
Rachel H.W. Bowdle ◽  
Barbara L. Warren ◽  
Jung Kim
Keyword(s):  
Knee Flexion ◽  
Peak Torque ◽  
Time Of Day ◽  
Flexion And Extension ◽  
Isokinetic Peak Torque

The Covariate Influence of Muscle Mass on Isokinetic Peak Torque in High School Wrestlers

1995 ◽  
Vol 7 (2) ◽  
pp. 176-182 ◽  
Author(s):  
Terry J. Housh ◽  
Jeffrey R. Stout ◽  
Dona J. Housh ◽  
Glen O. Johnson
Keyword(s):  
High School ◽  
Muscle Mass ◽  
Skeletal Muscle Mass ◽  
Peak Torque ◽  
Leg Extension ◽  
Free Weight ◽  
Age Related ◽  
Versus Peak ◽  
Flexion And Extension ◽  
Isokinetic Peak Torque

The purpose of this investigation was to examine the covariate influence of estimated muscle mass on age-related increases in isokinetic peak torque for flexion and extension of the forearm and leg in high school wrestlers. One hundred thirteen high school wrestlers volunteered to be measured for strength at 30, 180, and 300°·s−1. Underwater weighing was performed to determine body composition characteristics, and the anthropometric equation of Martin et al. (10) was used to estimate total skeletal muscle mass (MM). There were significant (p < .05) relationships (r = .19 to .37) for age versus peak torque covaried independently for fat-free weight (FFW) and MM for forearm flexion at 30, 180, and 300°·s−1; forearm extension at 180 and 300°·s−1; and leg extension at 30, 180 and 300°·s−1. The results of this study indicated that there was no increase across age in MM per unit of FFW, and the age-related increases in peak torque in high school wrestlers could not be fully accounted for by changes in MM.

Validity of Knee Flexion and Extension Peak Torque Prediction Models

1990 ◽  
Vol 70 (1) ◽  
pp. 3-10 ◽  
Author(s):  
Michael T Gross ◽  
Jennifer K Credle ◽  
L Annette Hopkins ◽  
Tracy M Kollins
Keyword(s):  
Knee Flexion ◽  
Prediction Models ◽  
Peak Torque ◽  
Flexion And Extension

scholarly journals Determination of the isokinetic muscle strength profile of knee flexors and extensors in visually impaired long-distance athletes: Pilot studyGörme engelli uzun mesafe atletizm sporcularında diz fleksör ve ekstansörlerinin izokinetik kas kuvvet profilinin belirlenmesi: Pilot çalışma

2017 ◽  
Vol 14 (2) ◽  
pp. 2111
Author(s):  
Tuğba Kocahan ◽  
Bihter Akınoğlu ◽  
Çağlar Soylu ◽  
Necmiye Ün Yıldırım ◽  
Adnan Hasanoğlu
Keyword(s):  
Muscle Strength ◽  
Knee Flexion ◽  
Visually Impaired ◽  
Peak Torque ◽  
Long Distance ◽  
Long Distance Running ◽  
The Right ◽  
Dominant Side ◽  
Knee Flexors ◽  
Flexion And Extension

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.

scholarly journals Isokinetic Leg Strength and Power in Elite Handball Players

2014 ◽  
Vol 41 (1) ◽  
pp. 227-233 ◽  
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.

Effect of Acute Static Stretching Duration on Isokinetic Peak Torque in Pubescent Soccer Players

2006 ◽  
Vol 18 (2) ◽  
pp. 252-261 ◽  
Author(s):  
Athanasios Zakas ◽  
George Doganis ◽  
Christos Galazoulas ◽  
Efstratios Vamvakoudis
Keyword(s):  
Knee Flexion ◽  
Force Production ◽  
Peak Torque ◽  
Soccer Players ◽  
Static Stretching ◽  
Warm Up ◽  
Angular Velocities ◽  
Leg Extensors ◽  
Isokinetic Peak Torque ◽  
Stretching Exercises

Although athletes routinely perform warm-up and stretching exercises, it has been suggested that prolonged stretching immediately before an activity might negatively affect the force production. Sixteen male pubescent soccer players participated in the study to examine whether a routine duration of acute static stretching is responsible for losses in isokinetic peak torque production. All participants performed two static stretching protocols in nonconsecutive training sessions. The first stretching protocol was performed three times for 15 s (volume 45) and the second 20 times for 15 s (volume 300). Range of motion (ROM) was determined during knee flexion with the use of a goniometer. The peak torque of the dominant leg extensors was measured on a Cybex NORM dynamometer at various angular velocities. The statistical analysis showed that peak torque did not change following the static stretching for 45 s in all angular velocities, while it decreased (p < .001) in all angular velocities following the static stretching for 5 min. The findings suggest that strength decreases after static stretching exercises may be the result of the performed stretching duration.

scholarly journals 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

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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