scholarly journals Validity and reliability of isometric knee extension muscle strength measurements using a belt-stabilized hand-held dynamometer: a comparison with the measurement using an isokinetic dynamometer in a sitting posture

2020 ◽  
Vol 32 (2) ◽  
pp. 120-124 ◽  
Author(s):  
Masahiro Hirano ◽  
Munenori Katoh ◽  
Masahiro Gomi ◽  
Saori Arai
Keyword(s):  
Muscle Strength ◽  
Knee Extension ◽  
Validity And Reliability ◽  
Isokinetic Dynamometer ◽  
Sitting Posture ◽  
Isometric Knee Extension

Validity and Reliability of an Instrumented Leg-Extension Machine for Measuring Isometric Muscle Strength of the Knee Extensors

2015 ◽  
Vol 24 (2) ◽  
Author(s):  
Caroline Ruschel ◽  
Alessandro Haupenthal ◽  
Gabriel Fernandes Jacomel ◽  
Heiliane de Brito Fontana ◽  
Daniela Pacheco dos Santos ◽  
...  
Keyword(s):  
Muscle Strength ◽  
Intraclass Correlation ◽  
Knee Extensors ◽  
Validity Study ◽  
Validity And Reliability ◽  
Isokinetic Dynamometer ◽  
Reliability Study ◽  
Leg Extension ◽  
New Instrument ◽  
Isometric Muscle

Context: Isometric muscle strength of knee extensors has been assessed for estimating performance, evaluating progress during physical training, and investigating the relationship between isometric and dynamic/functional performance. Objective: To assess the validity and reliability of an adapted leg-extension machine for measuring isometric knee extensor force. Design: Validity (concurrent approach) and reliability (test and test-retest approach) study. Setting: University laboratory. Participants: 70 healthy men and women aged between 20 and 30 y (39 in the validity study and 31 in the reliability study). Main Outcome Measures: Intraclass correlation coefficient (ICC) values calculated for the maximum voluntary isometric torque of knee extensors at 30°, 60°, and 90°, measured with the prototype and with an isokinetic dynamometer (ICC2,1, validity study) and measured with the prototype in test and retest sessions, scheduled from 48 h to 72 h apart (ICC1,1, reliability study). Results: In the validity analysis, the prototype showed good agreement for measurements at 30° (ICC2,1 = .75, SEM = 18.2 Nm) and excellent agreement for measurements at 60° (ICC2,1 = .93, SEM = 9.6 Nm) and at 90° (ICC2,1 = .94, SEM = 8.9 Nm). Regarding the reliability analysis, between-days' ICC1,1 were good to excellent, ranging from .88 to .93. Standard error of measurement and minimal detectable difference based on test-retest ranged from 11.7 Nm to 18.1 Nm and 32.5 Nm to 50.1 Nm, respectively, for the 3 analyzed knee angles. Conclusions: The analysis of validity and repeatability of the prototype for measuring isometric muscle strength has shown to be good or excellent, depending on the knee joint angle analyzed. The new instrument, which presents a relative low cost and easiness of transportation when compared with an isokinetic dynamometer, is valid and provides consistent data concerning isometric strength of knee extensors and, for this reason, can be used for practical, clinical, and research purposes.

Physical Activity, Sedentary Behavior, And Skeletal Muscle Strength In Patients With Chronic Kidney Disease: An Isotemporal Substitution Approach

2021 ◽  
Author(s):  
Masaki Yoshioka ◽  
Keisei Kosaki ◽  
Masahiro Matsui ◽  
Kanako Takahashi ◽  
Ai Shibata ◽  
...  
Keyword(s):  
Physical Activity ◽  
Skeletal Muscle ◽  
Muscle Strength ◽  
Sedentary Behavior ◽  
Knee Extension ◽  
Chair Stand ◽  
Knee Extension Strength ◽  
Isometric Knee Extension ◽  
Intensity Physical Activity ◽  
Skeletal Muscle Strength

Abstract Objective Insufficient physical activity and excessive sedentary behavior can contribute to decreased skeletal muscle strength, which is strongly associated with increased mortality in patients with chronic kidney disease (CKD). However, the potential impact of replacing sedentary behavior with physical activity on skeletal muscle strength remains unclear in these patients. The purpose of this study was to examine the associations of physical activity, sedentary behavior, and skeletal muscle strength in patients with CKD using an isotemporal substitution model to estimate the associations on replacing time from one behavior to another while keeping the total time and other behaviors fixed. Methods A total of 108 patients with CKD (mean age = 65 [SD = 9] y; mean estimated glomerular filtration rate = 57 [SD = 22] mL/min/1.73m2) participated in this cross-sectional analysis study. The time spent in sedentary behavior, light-intensity physical activity, and moderate- to vigorous-intensity physical activity (MVPA) were assessed using a triaxial accelerometer. Handgrip strength, isometric knee extension strength, and 30-second chair stand test were used to measure skeletal muscle strength. Results In multivariate analyses (single-factor and partition models), the time spent in MVPA was beneficially associated with both isometric knee extension strength and 30-second chair stand test. Furthermore, the isotemporal substitution model found that replacing 10 minutes per day of sedentary behavior or light-intensity physical activity with equivalent MVPA time was beneficially associated with both isometric knee extension strength and 30-second chair stand test. Conclusions Our cross-sectional findings indicate that MVPA time is beneficially associated with lower extremity muscle strength and that a slight increase in the MVPA time may contribute to maintaining skeletal muscle strength in patients with CKD. Impact Increasing the time spent in MVPA (10 min/day) may be a feasible strategy in patients with CKD, who have a high prevalence of impaired physical function.

scholarly journals Reliability of Concentric, Eccentric and Isometric Knee Extension and Flexion when using the REV9000 Isokinetic Dynamometer

2013 ◽  
Vol 37 (1) ◽  
pp. 47-53 ◽  
Author(s):  
Alberto César Pereira de Carvalho Froufe Andrade ◽  
Paolo Caserotti ◽  
Carlos Manuel Pereira de Carvalho ◽  
Eduardo André de Azevedo Abade ◽  
António Jaime da Eira Sampaio
Keyword(s):  
Performance Studies ◽  
Sports Medicine ◽  
Dynamic Control ◽  
Knee Extensor ◽  
Knee Extension ◽  
Isokinetic Strength ◽  
Isokinetic Dynamometer ◽  
Flexor Muscle ◽  
Physically Active ◽  
Isometric Knee Extension

The aim of this study was to assess the reliability of isokinetic and ISO knee extensor and flexor muscle strength when using the REV9000 (Technogym) isokinetic dynamometer. Moreover, the reliability of several strength imbalance indices and bilateral ratios were also examined. Twenty-four physically active healthy subjects (age 23±3 years) underwent three testing sessions, two on the same day and a third, 7 days later. All sessions proceeded in the same order: five concentric contractions at 60ºs-1 followed by an isometric contraction (5 seconds) and five eccentric contractions (60ºs-1). The results of this study showed a high reproducibility in eccentric (0.95-0.97), concentric (0.95- 0.96) and isometric (0.93-0.96), isokinetic strength for knee extensor and flexor muscles, thus indicating that the REV9000 isokinetic dynamometer can be used in future sports performance studies. A low-to-moderate reliability was found in the isokinetic strength bilateral ratios while the Hamstring:Quadricep concentric ratio showed moderate reliability. The highest reliability (>0.90) was observed in the dynamic control ratio (Hamstring eccentric:Quadricep concentric) which consequently confirms that it is a more valid indicator for imbalanced reciprocal parameters and can be used in rehabilitation and sports medicine.

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