scholarly journals Reliability assessment for isometric strength test by scales and dynamometer for knee extensors

2012 ◽  
Vol 55 ◽  
pp. e159-e160
Author(s):  
A.V. Bruyneel ◽  
P. Deat
Keyword(s):  
Reliability Assessment ◽  
Strength Test ◽  
Isometric Strength ◽  
Knee Extensors

Isometric strength test consistency over time

1983 ◽  
Author(s):  
Terrence J. Stobbe ◽  
Ralph W. Plummer ◽  
Donald P. Shreves
Keyword(s):  
Strength Test ◽  
Isometric Strength ◽  
Over Time

Developmental Changes in Isometric Strength: Longitudinal Study in Adolescent Soccer Players

2018 ◽  
Vol 39 (09) ◽  
pp. 688-695 ◽  
Author(s):  
Joao Duarte ◽  
João Valente-dos-Santos ◽  
Manuel Coelho-e-Silva ◽  
R. Malina ◽  
Dieter Deprez ◽  
...  
Keyword(s):  
Skeletal Maturity ◽  
Isometric Strength ◽  
Fat Free Mass ◽  
Knee Extensors ◽  
Annual Increment ◽  
Systematic Assessment ◽  
Dependent Variables ◽  
Muscle Groups ◽  
Knee Muscle ◽  
Knee Flexors

AbstractThis study aimed to examine longitudinal changes in isometric strength of the knee extensors (ImKE) and knee flexors (ImKF) at 30° and 60°. The sample was composed of 67 players aged 11.0–13.9 years at baseline over five years. Stature, body mass, skinfolds, and isometric strength (ImKE30°, ImKF30°, ImKE60° and ImKF60°) were measured. Fat mass and fat-free mass (FFM) were derived from skinfolds. Skeletal age was obtained using TW2 RUS. Multilevel random effects regression analyses extracted developmental polynomial models. An annual increment on chronological age (CA) corresponded to 5.6 N (ImKE30°), 2.7 N (ImKF30°), 4.6 N (ImKE60°) and 1.5 N (ImKF60°). An increment of 1 kg in FFM predicted isometric strength as follows: 1.2 N (ImKE30°), 2.1 N (ImKF30°), 3.1 N (ImKE60°) and 2.0 N (ImKF60°). The following equations were obtained: ImKE30°=5.759×CA+1.163×FFM; ImKF30°=−19.369+2.691×CA+0.693×CA2+2.108×FFM; ImKE60°=4.553×CA+3.134×FFM; and, ImKF60°=-19.669+1.544×CA+2.033×FFM. Although skeletal maturity had a negligible effect on dependent variables, age and body size, based on FFM, were relevant longitudinal predictors. During adolescence, systematic assessment of knee extensors and knee flexors are strongly recommended to prevent impairment of knee muscle groups.

The Minimum Number of Attempts for a Reliable Isometric Strength Test Score

2019 ◽  
Vol 2 (1) ◽  
pp. 89-95 ◽  
Author(s):  
Sunggun Jeon ◽  
William M. Miller ◽  
Minsoo Kang ◽  
Xin Ye
Keyword(s):  
Test Score ◽  
Strength Test ◽  
Isometric Strength ◽  
Minimum Number

scholarly journals The Athletic Shoulder (ASH) test: reliability of a novel upper body isometric strength test in elite rugby players

2018 ◽  
Vol 4 (1) ◽  
pp. e000365 ◽  
Author(s):  
Ben Ashworth ◽  
Patrick Hogben ◽  
Navraj Singh ◽  
Laura Tulloch ◽  
Daniel D Cohen
Keyword(s):  
Injury Risk ◽  
Shoulder Girdle ◽  
Strength Test ◽  
Isometric Strength ◽  
Test Reliability ◽  
Upper Body ◽  
Minimal Detectable Change ◽  
Detectable Change ◽  
Minimum Detectable Change ◽  
Rugby Players

ObjectivesLower limb isometric tests are used to assess strength and strength asymmetries and monitor reductions in muscle force that may contribute to loss of performance and increase injury risk. Isometric tests in the upper body may be appropriate to monitor neuromuscular performance of the shoulder joint in sports involving contact and overhead actions. The aim of this study was to determine the reliability of a novel upper body isometric strength test.MethodsEighteen elite rugby players (age 22.4±4.6 years; body mass 95.5±13.4 kg) were tested on consecutive days. Maximal isometric contractions using both limbs against a force platform were assessed at three angles of abduction (180°, ‘I’; 135°, ‘Y’ and 90°, ‘T’), in a prone lying position. To evaluate interday reliability, intraclass coefficients (ICC) were calculated for mean net peak force (NPF) and highest NPF achieved in any trial (peak NPF). Intratrial variability was assessed using coefficient of variation (CV), and the standard error of measurement (SEM) was used to calculate minimal detectable change (MDC).ResultsInterday reliability for NPF was excellent in all test positions (ICC 0.94–0.98). The test demonstrated high absolute reliability values (SEM 4.8–10.8) and interday measurement error was below 10% in all test positions (CV 5.0–9.9%) except for the non-dominant arm I-position (CV 11.3%). Minimum detectable change was between 13.2 and 25.9 N.ConclusionThe Athletic Shoulder test demonstrated excellent reliability for each test position supporting its use as a reliable tool to quantify the ability to produce and transfer force across the shoulder girdle.

Identification of feigned strength test of the knee extensors and flexors based on the shape of the isokinetic torque curve

2001 ◽  
Vol 9 (1) ◽  
pp. 45-50 ◽  
Author(s):  
M. Ayalon ◽  
M. Rubinstein ◽  
Y. Barak ◽  
A. Dunsky ◽  
D. Ben-Sira
Keyword(s):  
Strength Test ◽  
Knee Extensors ◽  
Torque Curve ◽  
Isokinetic Torque

Development of a new isometric strength test using an isoinertial-based weight machine

2010 ◽  
Vol 12 (2) ◽  
pp. 81-86 ◽  
Author(s):  
Jesper Augustsson ◽  
Magnus Bruno ◽  
Joakim Swärd
Keyword(s):  
Strength Test ◽  
Isometric Strength

scholarly journals Acute effect of three different warm-up protocols on maximal isokinetic strength in young men

2019 ◽  
Author(s):  
Patrick Rodrigues ◽  
Sara Gabellone Hernandez ◽  
Fabiano De Macedo Salgueirosa ◽  
Ednaldo Oliveira ◽  
Lee Wharton ◽  
...  
Keyword(s):  
Repeated Measures ◽  
Acute Effect ◽  
Strength Test ◽  
Knee Extensors ◽  
Isokinetic Strength ◽  
Control Session ◽  
Total Work ◽  
Warm Up ◽  
Randomized Design ◽  
Strength Capacity

Objective: To investigate the acute effect of three different warm-up protocols on a maximal isokinetic strength test. Methods: Twenty-two male, recreational athletes involved in regular resistance training were evaluated. Subjects performed a maximal isokinetic strength test of the knee extensors in an isokinetic dynamometer after completing a control session or one of the following warm-up protocols using a randomized design: a general warm-up, stretching warm-up, or specific warm-up. The comparison between treatments was completed through Repeated-Measures Analysis of Variance, followed by a Bonferroni “post hoc” test (p < 0.05). Results: The only difference found was the concentric peak moment following the application of the specific warm-up protocol, which was lower than the control session (12.94%; p < 0.05). No other differences were noted in eccentric peak movement or total work (concentric + eccentric) parameter after application of any the warm-up protocols within control condition (p > 0.05). Conclusion: The finding of this investigation showed that none of warm-up protocols applied were able to change the total work of maximal isokinetic strength. Thus, our investigation suggests that the general warm-up, stretching warm-up and specific warm-up have had no adverse or improved effectiveness on acute muscle strength capacity.

scholarly journals Knee Angle Affects Posterior Chain Muscle Activation During an Isometric Test Used in Soccer Players

Sports ◽  
2019 ◽  
Vol 7 (1) ◽  
pp. 13 ◽  
Author(s):  
Paul James Read ◽  
Anthony Nicholas Turner ◽  
Richard Clarke ◽  
Samuel Applebee ◽  
Jonathan Hughes
Keyword(s):  
Muscle Activation ◽  
Gluteus Maximus ◽  
Biceps Femoris ◽  
Strength Test ◽  
Isometric Strength ◽  
Medial Gastrocnemius ◽  
Soccer Players ◽  
Emg Activity ◽  
Hamstring Muscle ◽  
Knee Angle

Background: It has been suggested that altering the knee flexion angle during a commonly used supine isometric strength test developed with professional soccer players changes preferential hamstring muscle recruitment. The aim of this study was to examine the electromyography (EMG) knee joint-angle relationship during this test, as these data are currently unknown. Methods: Ten recreational male soccer athletes (age: 28 ± 2.4 years) were recruited and performed a supine isometric strength test on their dominant leg with the knee placed at two pre-selected flexion angles (30° and 90°). The surface EMG of the gluteus maximus, biceps femoris, semitendinosus, and medial gastrocnemius was measured, in addition to the within-session reliability (intraclass correlation coefficient (ICC) and coefficient of variation (CV)). Results: Within-session reliability showed large variation dependent upon the test position and muscle measured (CV% = 8.8–36.1) Absolute mean EMG activity and percentage of maximum voluntary isometric contraction (MVIC) indicated different magnitudes of activation between the two test positions; however, significant mean differences were present for the biceps femoris only with greater activation recorded at the 30° knee angle (% MVIC: 31 ± 9 vs. 22 ± 7; p = 0.002). These differences (30% mean difference) were greater than the observed typical measurement error (CV% = 13.1–14.3 for the 90° and 30° test positions, respectively). Furthermore, the percentage MVIC showed a trend of heightened activation of all muscles with the knee positioned at 30°, but there was also more within-subject variation, and this was more pronounced for the gluteus maximus (CV% = 36.1 vs. 19.8) and medial gastrocnemius (CV% 31 vs. 22.6). Conclusions: These results indicate that biceps femoris and overall posterior chain muscle activation is increased with the knee positioned at 30° of flexion; however, the 90° angle displayed less variation in performance within individual participants, especially in the gluteus maximus and medial gastrocnemius. Thus, practitioners using this test to assess hamstring muscle strength should ensure appropriate familiarisation is afforded, and then may wish to prioritise the 30° knee position.

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