Reliability and Precision of Isokinetic Strength and Muscular Endurance for the Quadriceps and Hamstrings

Pincivero, Danny M.; Lephart, Scott M.; Karunakara, R. A.

doi:10.1055/s-2007-972605

Cited by 175 publications

(136 citation statements)

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“…Five load/unload cycles were performed at preset angular velocities of 1,2,5,10,15,20,25,30,35,40,45,50,75,100,125,150,175,200,225,250, 275 and 300…”

Section: Protocolmentioning

confidence: 99%

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Accuracy of Biodex system 3 pro computerized dynamometer in passive mode

Nordez

Casari

Cornu

2008

Medical Engineering & Physics

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A specific experimental design has been developed to determine the accuracy of the Biodex system 3 pro dynamometer in passive mode. Five cyclic stretching repetitions were imposed to an elastic rubber band at different velocities using the dynamometer, and the torque produced was measured using both the dynamometer and external force and position sensors. Velocity patterns performed by the dynamometer were also characterized and our results show that these patterns were reliable (ICC = 1.00). The torque measured with the dynamometer and the sensors were reliable (ICC = 1.00), although significant differences were observed between both methods. However, the measured torque standard error was velocity independent and was lower than 0.33 N m. Moreover, regressions between the two torque measurements were close to the axes-bisector (r = 1.00, slope: 1.01 ± 0.01, y-intercept: −0.36 ± 0.22 N m). Finally, our results showed decreases in torque during the five cycles, but these decreases were not due to the dynamometer. It can be concluded that the dynamometer performed valid torque measurements in passive mode, and was an accurate tool to determine passive mechanical properties of the musculo-articular system. However, some discrepancies between the programmed and the measured speed profiles have been observed when approaching the speed limit of the system.

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“…Five load/unload cycles were performed at preset angular velocities of 1,2,5,10,15,20,25,30,35,40,45,50,75,100,125,150,175,200,225,250, 275 and 300…”

Section: Protocolmentioning

confidence: 99%

“…Some studies have validated their use to assess strength production capacities in different modes [1,2]. However, the reliability and validity of computerized dynamometers in different modes has yet to be demonstrated [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Accuracy of Biodex system 3 pro computerized dynamometer in passive mode

Nordez

Casari

Cornu

2008

Medical Engineering & Physics

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“…In this study, isokinetic knee extension and flexion peak torque were assessed at 2 angular velocities of movement using BIODEX dynamometer (VAC system 3 PRO, New York, USA) with a rest period of 10 s between the trials: 60 0 .s -1 and 180 0 .s -1 (Pincivero, Lephart and Karunakara, 1997). Testing at each velocity consisted of 5 sub-maximal followed by 2-3 maximal repetitions for warm-up purposes.…”

Section: Muscular Knee Peak Torque (Strength) Measurementmentioning

confidence: 99%

Untitled

2017

JPES

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Problem statement: Data on bone health status, muscular peak torque (an indicator of muscular strength) and power is still lacking in non-active young Malays. Moreover, no study has been undertaken to investigate the association between bone health and anaerobic capacity in the Malay population. Hence, the present study was designed to address the paucity of this information. Approach: Young, healthy Malay females (n=33) and males (n=33) university students aged 18-25 years old were recruited for this study. The quantitative ultrasound measurements of bone speed of sound (SOS) in the legs were measured using a bone sonometer. Muscular peak torque of knee extension and flexion at 60 0 .s -1 and 180 0 .s -1 were measured using a BIODEX isokinetic dynamometer. Anaerobic capacities of the participants were determined via the Wingate anaerobic test. Purpose: To investigate the relationships of lower limbs' quantitative ultrasound measurement of the bones with muscular peak torque and anaerobic capacities in Malay university students. Results: Correlation coefficient (r) between non-dominant tibial SOS and muscular peak torque at 60 0 .s -1 and 180 0 .s -1 in female participants was 0.448 (p=0.009) and 0.388 (p=0.026) respectively. In males, moderate correlation was found between nondominant tibial SOS and muscular peak torque at 180 0 .s -1 knee flexion (r=0.419, p=0.015). Conclusions: There were moderate correlations (p<0.05) between muscular peak torque, mean power and peak power in the male participants. Nevertheless, no significant correlations were observed between tibial SOS and anaerobic capacities of mean power and peak power in both females and males. There were moderate relationships between quantitative ultrasound measurement of the bones with muscular strength, but not with anaerobic capacities in university students.

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“…Majority of work done on shoulder strength in overhead athletes has been done using Isokinetic type of muscle work in the concentric and eccentric mode clearly due to the reason that a Isokinetic measurements allows high reproducibility (r=0.82-0.96) (Pincivero et al, 1997) and measurements at high speeds with accommodating resistance which was thought of as having more relevance to function.…”

Section: Introductionmentioning

confidence: 99%