Intramachine and Intermachine Reliability of the Biodex and Cybex<sup>®</sup>II for Knee Flexion and Extension Peak Torque and Angular Work

Gross, Michael T.; Huffman, Greta M.; Phillips, Cheryl N.; Wray, Josie

doi:10.2519/jospt.1991.13.6.329

Cited by 73 publications

(44 citation statements)

References 6 publications

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“…Gross et al 13) reported ICCs of between 0.92 and 0.97 in a study using two types of isokinetic dynamometers to measure the force of knee extensions performed at 60 degrees/s and 180 degrees/s. Wikholm et al 7) and Agre et al 8) reported that the interrater reliability of strength measurements made using a HHD was poorer for the lower than the upper limbs.…”

Section: Discussionmentioning

confidence: 99%

Comparison of Reliability of Isometric Leg Muscle Strength Measurements Made Using a Hand-Held Dynamometer with and without a Restraining Belt

2009

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Abstract.[Purpose] The aim of this study was to evaluate whether using a belt to restrain a hand-held dynamometer improves reliability of isometric leg muscle strength measurements in healthy subjects.[Subjects] Twenty to 44 healthy subjects participated in the test.[Methods] Two raters, one man and one woman, used a hand-held dynamometer with or without a restraining belt to measure the isometric strengths of the following muscle groups: flexors, extensors, abductors, adductors, internal rotators and external rotators of the hip; flexors and extensors of the knee; and dorsiflexors and plantar flexors of the ankle.[Results] The intraclass correlation coefficient, used to describe interrater agreement, ranged from 0.97 to 0.99 with the belt and from 0.21 to 0.88 without the belt. Pearson's correlation coefficient for measurements with versus without the belt ranged from 0.61 to 0.95 for the man and from 0.31 to 0.87 for the woman.[Conclusion] The interrater reliability of isometric leg muscle strength measurements was improved by use of a belt to restrain the hand-held dynamometer.

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Section: Discussionmentioning

confidence: 99%

Comparison of Reliability of Isometric Leg Muscle Strength Measurements Made Using a Hand-Held Dynamometer with and without a Restraining Belt

2009

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“…Only data recorded within 0.1°/second of 60°/second were included. The reliability of windowed data on concentric knee flexion and extension has been reported as r ϭ 0.90 -0.96 on Biodex systems (32). For each muscle group, the 5 peak windowed values for flexion and extension were averaged for each participant.…”

Section: Pathophysiologic Factorsmentioning

confidence: 99%

“…Then, 5 trials of maximum effort concentric knee flexion and extension at 60°/second were performed with verbal encouragement. To maximize reliability and validity, the data were "windowed" to remove acceleration and deceleration, thereby eliminating impact artifact (31,32). Only data recorded within 0.1°/second of 60°/second were included.…”

Section: Pathophysiologic Factorsmentioning

confidence: 99%

Determinants of self efficacy for physical tasks in people with knee osteoarthritis

Maly¹,

Costigan²,

Olney³

2006

Arthritis & Rheumatism

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Objective. Self efficacy, the confidence an individual has to perform a task, is an important determinant of physical performance in individuals with knee osteoarthritis (OA). The purpose of this study was to determine what personal, pathophysiologic, and impairment factors relate to self efficacy for physical tasks in community-dwelling adults with knee OA. Methods. Fifty-four persons with radiographically confirmed knee OA (mean ؎ SD age 68.3 ؎ 8.7 years, range 50 -87 years) participated. The Functional Self-Efficacy subscale of the Arthritis Self-Efficacy Scale was the dependent measure. Independent measures included age, education, scores from the Center for Epidemiologic Studies Depression and State-Trait Anxiety Inventory questionnaires, medial joint space and varus/valgus tibiofemoral angle from radiographs, body mass index, and isokinetic quadriceps and hamstrings strength. Knee pain and stiffness, assessed using the Western Ontario and McMaster Universities Osteoarthritis Index, were independent measures. Results. Fifty-one percent of the variance of Functional Self Efficacy was explained by knee stiffness, hamstrings strength, age, and depression scores. Pain, education, anxiety, radiographic joint space, and body weight did not significantly contribute to the variance in Functional Self-Efficacy scores. Substituting quadriceps strength for hamstrings strength resulted in a regression model that included only stiffness, age, and depression, which explained nearly as much variance as the original model. Conclusion. Self efficacy for physical tasks is related to the sensation of stiffness, hamstrings strength, age, and level of depressive symptoms in persons with knee OA. Clinicians and researchers could consider these variables when assessing the level of self efficacy for physical tasks in persons with knee OA.

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“…Previous isokinetic measures for concentric quadriceps peak torque at 60 deg.s Ϫ1 on the Biodex Isokinetic Dynamometer has demonstrated high test-retest intraclass correlation coefficients that ranged from 0.93 to 0.97. 9,12,32 Perceptually Guided Contractions. Immediately following the maximal effort contractions, subjects performed a series of perceptually guided contractions, with assistance from a modified category-ratio scale (CR-10) as developed by Borg.…”

Section: Measurement Of Knee Extensor Peak Torque and Workmentioning

confidence: 99%

Knee extensor torque, work, and EMG during subjectively graded dynamic contractions

2003

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We examined knee extensor peak torque, work, and electromyogram (EMG) during dynamic contractions to perceived exertion levels in men and women. Thirty subjects performed three maximal effort isokinetic knee extensions (60 deg x s(-1)), followed by three contractions to each of nine separate levels of perceived exertion. Surface EMG of the vastus medialis (VM), vastus lateralis (VL), and rectus femoris (RF), and knee extensor peak torque and work were normalized to a percent of each respective value obtained during the maximal effort contractions. The results demonstrated a significant linear increase in voluntary knee extensor peak torque and work across perceived exertion levels. Knee extensor peak torque and work were less than 70%, 80%, and 90% maximal voluntary contraction (MVC) at perceived exertion levels 7, 8, and 9, respectively. A significant increase in VM, VL, and RF muscle EMG was observed across perceived exertion levels 1 through 9, with EMG increase highest for the VL. The findings demonstrate that dynamic contractions guided by perceived exertion are underproduced at relatively high perceptual intensities, and that reliance on VL activation occurs across submaximal torque levels. The overestimation of knee extensor peak torque and work at relatively high perceptual intensities may suggest the presence of a subconscious mechanism aiming to reduce high muscle and joint forces.

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Intramachine and Intermachine Reliability of the Biodex and Cybex^®II for Knee Flexion and Extension Peak Torque and Angular Work

Cited by 73 publications

References 6 publications

Comparison of Reliability of Isometric Leg Muscle Strength Measurements Made Using a Hand-Held Dynamometer with and without a Restraining Belt

Comparison of Reliability of Isometric Leg Muscle Strength Measurements Made Using a Hand-Held Dynamometer with and without a Restraining Belt

Determinants of self efficacy for physical tasks in people with knee osteoarthritis

Knee extensor torque, work, and EMG during subjectively graded dynamic contractions

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Intramachine and Intermachine Reliability of the Biodex and Cybex®II for Knee Flexion and Extension Peak Torque and Angular Work

Cited by 73 publications

References 6 publications

Comparison of Reliability of Isometric Leg Muscle Strength Measurements Made Using a Hand-Held Dynamometer with and without a Restraining Belt

Comparison of Reliability of Isometric Leg Muscle Strength Measurements Made Using a Hand-Held Dynamometer with and without a Restraining Belt

Determinants of self efficacy for physical tasks in people with knee osteoarthritis

Knee extensor torque, work, and EMG during subjectively graded dynamic contractions

Contact Info

Product

Resources

About

Intramachine and Intermachine Reliability of the Biodex and Cybex^®II for Knee Flexion and Extension Peak Torque and Angular Work