Effect of Velocity on the Bilateral Deficit During Dynamic Knee Extension and Flexion Exercise in Females

Brown, Lee E.; Whitehurst, Michael; Gilbert, Russ; Findley, Brian W.; Buchalter, David N.

doi:10.3233/ies-1994-4406

Cited by 14 publications

(13 citation statements)

References 10 publications

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“…Only two previous studies have examined knee flexion (Brown et al 1994, Kuruganti et al 2005) and both found similar BLR when compared to knee extension. This study found that the mean BLR torque across three groups of females was similar for flexion (72%) and extension (74%).…”

Section: Discussionsupporting

confidence: 49%

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The bilateral leg strength deficit is present in old, young and adolescent females during isokinetic knee extension and flexion

Kuruganti

Seaman

2006

Eur J Appl Physiol

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The bilateral limb deficit (BLD) describes the difference in maximal or near maximal force generating capacity of muscles when they are contracted alone or in combination with the contralateral muscles. A deficit occurs when the summed unilateral force is greater than the bilateral force. This study examined the presence of the BLD during isokinetic knee extensions and flexions in a group of adolescent females (n=8, mean of 15+/-1 years) and compared with previously reported data by this researcher of adult and older females. Data were collected from subjects during slow (45 deg/s) isokinetic knee extensions and flexions and it was found that a BLD exists during both extension and flexion regardless of age. Furthermore, this study is the first to examine the presence of the deficit in an adolescent population. Myoelectric signal (MES) data showed that there is no difference between bilateral and unilateral isokinetic knee extensions and flexions regardless of age group.

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Section: Discussionsupporting

confidence: 49%

“…Lower limb dynamic knee extension movements show a range of BLR torque from 78 to 108% (Owings and Grabiner 1998;Taniguchi 1997;Vandervoort et al 1984;Coyle et al 1981;Brown et al 1994) and may be dependent on experimental protocols used, the range of the contraction velocity (slow to fast contractions), and the fitness of the participants.…”

Section: Discussionmentioning

confidence: 99%

The bilateral leg strength deficit is present in old, young and adolescent females during isokinetic knee extension and flexion

Kuruganti

Seaman

2006

Eur J Appl Physiol

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“…Only Brown et al (1994) examined knee flexion, and they found that BLR Torque for flexion was slightly less (84%) than for knee extension (88%). That study used 60°/s as the velocity of contraction.…”

Section: Discussionmentioning

confidence: 95%

“…Lower limb dynamic movements show a range of BLR Torque from 50% to 160% (Owings and Grabiner 1998;Taniguchi 1997Taniguchi , 1998Vandervoort et al 1984;Coyle et al 1981;Brown et al 1994;Sexsmith and Woods 1997). This may be dependent on the experimental protocols used, the range of the contraction velocity (slow to fast contractions) and the fitness of the participants.…”

Section: Discussionmentioning

confidence: 96%

Bilateral isokinetic training reduces the bilateral leg strength deficit for both old and young adults

et al. 2005

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The bilateral limb deficit (BLD) describes the difference in maximal or near-maximal force generating capacity of muscles when they are contracted alone and in combination with the contralateral muscles. This study examined the effects of a 6-week (three times per week) bilateral leg strength training programme on BLD in younger and older adults. Data were collected from 33 subjects during slow (45 degrees /s) isokinetic knee extensions and flexions before and after the training programme. After training, the BLD was reduced for extension (73.3-86.9%; P < 0.001) but not for flexion (67.5-71.2%; P = 0.13) regardless of age and gender. This study suggests that difficulty in recruiting all muscle units during a task involving bilateral activation can be improved by training, although such an effect appears to depend on the muscle group appreciated.

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“…Similarly, Vandervoort et al [18] found BLD to increase linearly with velocity across speeds ranging from 0 to 424 • /s. In contrast, Brown et al [19] found a decrease in BLD as isokinetic speed increased from 60 • /s to 360 • /s for the knee extensors. However, a comparison of BLD between different muscular actions has not been conducted.…”

Section: Introductionmentioning

confidence: 83%

Bilateral deficit between concentric and isometric muscle actions

Botton

Radaelli

Wilhelm

et al. 2013

IES

Self Cite

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The greater torque generation capacity of muscles when contracted alone than in combination with contralateral muscles, characterizes the bilateral limb deficit (BLD) phenomenon. Few studies have explored the BLD in dynamic movements, because isometric actions are considered ideal for evaluating strength. Therefore, the aim of this study was to compare BLD between isometric and concentric actions of the knee extensors. Eleven healthy young men (age = 20.6 ± 1 yrs; weight = 71.4 ± 6.4 kg; height = 174.4 ± 7 cm) volunteered to participate. Initially, subjects visited the laboratory for familiarization with the test protocols. On two subsequent randomized days they performed a test protocol with either a unilateral (right and left limbs) or bilateral condition, with 48 h rest between. The test protocol was composed of five isokinetic concentric actions of the knee extensors at 60 • /s and three isometric actions at a 60 • angle of knee flexion. The greatest peak torque of the two conditions was used for analyses. Both muscle actions demonstrated greater values unilaterally (p < 0.05) than bilaterally and BLD values were not significantly different between them (p > 0.05). Therefore, if muscle torque production is greater unilaterally, athletes and coaches may utilize unilateral exercises to increase training loads.

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Effect of Velocity on the Bilateral Deficit During Dynamic Knee Extension and Flexion Exercise in Females

Cited by 14 publications

References 10 publications

The bilateral leg strength deficit is present in old, young and adolescent females during isokinetic knee extension and flexion

The bilateral leg strength deficit is present in old, young and adolescent females during isokinetic knee extension and flexion

Bilateral isokinetic training reduces the bilateral leg strength deficit for both old and young adults

Bilateral deficit between concentric and isometric muscle actions

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