Changes in fascicle length from rest to maximal voluntary contraction affect the assessment of voluntary activation

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Changes in fascicle length from rest to maximal voluntary contraction affect the assessment of voluntary activation. / Arampatzis, Adamantios; Mademli, Lida; De Monte, Gianpiero; Walsh, Mark.

In: Journal of biomechanics, Vol. 40, No. 14, 01.01.2007, p. 3193-3200.

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@article{44d8c5fdee744c3bae47cbf817ee1de4,
title = "Changes in fascicle length from rest to maximal voluntary contraction affect the assessment of voluntary activation",
abstract = "The purpose of this study was to investigate the effect of the differences between the actual fascicle length during a voluntary contraction and the fascicle length at rest of the triceps surae muscle on the determination of the voluntary activation (VA) by using the interpolated twitch technique. Twelve participants performed isometric voluntary maximal (MVC) and submaximal (20%, 40%, 60% and 80% MVC) contractions at two different ankle angles (75 degrees and 90 degrees ) under application of the interpolated twitch technique. Two ultrasound probes were used to determine the fascicle length of soleus, gastrocnemius medialis and gastrocnemius lateralis muscles. Further, the MVCs and the twitches were repeated for six more ankle angles (85 degrees , 95 degrees , 100 degrees , 105 degrees , 110 degrees and 115 degrees ). The VA of the triceps surae muscle were calculated (a) using the rest twitch force (RTF) measured during the same trial as the interpolated twitch force (ITF; traditional method) and (b) using the RTF at an ankle angle where the fascicle length showed similar values between ITF and RTF (fascicle length consideration method). The continuous changes in fascicle length from rest to MVC affect the accuracy of the assessment of the VA. The traditional method overestimates the assessment of the VA on average 4% to 12%, especially at 90 degrees ankle angle (i.e. short muscle length). The reason for this influence is the unequal force-length potential of the muscle at twitch application by the measure of ITF and RTF. These findings provide evidence that the fascicle length consideration method permits a more precise prediction (an improvement of 4-12%) of the voluntary contraction compared to the traditional method.",
keywords = "Adult, Bundle of His, Female, Humans, Male, Muscle Contraction, Muscle, Skeletal, Rest",
author = "Adamantios Arampatzis and Lida Mademli and {De Monte}, Gianpiero and Mark Walsh",
year = "2007",
month = jan,
day = "1",
doi = "10.1016/j.jbiomech.2007.04.011",
language = "English",
volume = "40",
pages = "3193--3200",
journal = "Journal of biomechanics",
issn = "0021-9290",
publisher = "Elsevier",
number = "14",

}

RIS

TY - JOUR

T1 - Changes in fascicle length from rest to maximal voluntary contraction affect the assessment of voluntary activation

AU - Arampatzis, Adamantios

AU - Mademli, Lida

AU - De Monte, Gianpiero

AU - Walsh, Mark

PY - 2007/1/1

Y1 - 2007/1/1

N2 - The purpose of this study was to investigate the effect of the differences between the actual fascicle length during a voluntary contraction and the fascicle length at rest of the triceps surae muscle on the determination of the voluntary activation (VA) by using the interpolated twitch technique. Twelve participants performed isometric voluntary maximal (MVC) and submaximal (20%, 40%, 60% and 80% MVC) contractions at two different ankle angles (75 degrees and 90 degrees ) under application of the interpolated twitch technique. Two ultrasound probes were used to determine the fascicle length of soleus, gastrocnemius medialis and gastrocnemius lateralis muscles. Further, the MVCs and the twitches were repeated for six more ankle angles (85 degrees , 95 degrees , 100 degrees , 105 degrees , 110 degrees and 115 degrees ). The VA of the triceps surae muscle were calculated (a) using the rest twitch force (RTF) measured during the same trial as the interpolated twitch force (ITF; traditional method) and (b) using the RTF at an ankle angle where the fascicle length showed similar values between ITF and RTF (fascicle length consideration method). The continuous changes in fascicle length from rest to MVC affect the accuracy of the assessment of the VA. The traditional method overestimates the assessment of the VA on average 4% to 12%, especially at 90 degrees ankle angle (i.e. short muscle length). The reason for this influence is the unequal force-length potential of the muscle at twitch application by the measure of ITF and RTF. These findings provide evidence that the fascicle length consideration method permits a more precise prediction (an improvement of 4-12%) of the voluntary contraction compared to the traditional method.

AB - The purpose of this study was to investigate the effect of the differences between the actual fascicle length during a voluntary contraction and the fascicle length at rest of the triceps surae muscle on the determination of the voluntary activation (VA) by using the interpolated twitch technique. Twelve participants performed isometric voluntary maximal (MVC) and submaximal (20%, 40%, 60% and 80% MVC) contractions at two different ankle angles (75 degrees and 90 degrees ) under application of the interpolated twitch technique. Two ultrasound probes were used to determine the fascicle length of soleus, gastrocnemius medialis and gastrocnemius lateralis muscles. Further, the MVCs and the twitches were repeated for six more ankle angles (85 degrees , 95 degrees , 100 degrees , 105 degrees , 110 degrees and 115 degrees ). The VA of the triceps surae muscle were calculated (a) using the rest twitch force (RTF) measured during the same trial as the interpolated twitch force (ITF; traditional method) and (b) using the RTF at an ankle angle where the fascicle length showed similar values between ITF and RTF (fascicle length consideration method). The continuous changes in fascicle length from rest to MVC affect the accuracy of the assessment of the VA. The traditional method overestimates the assessment of the VA on average 4% to 12%, especially at 90 degrees ankle angle (i.e. short muscle length). The reason for this influence is the unequal force-length potential of the muscle at twitch application by the measure of ITF and RTF. These findings provide evidence that the fascicle length consideration method permits a more precise prediction (an improvement of 4-12%) of the voluntary contraction compared to the traditional method.

KW - Adult

KW - Bundle of His

KW - Female

KW - Humans

KW - Male

KW - Muscle Contraction

KW - Muscle, Skeletal

KW - Rest

U2 - 10.1016/j.jbiomech.2007.04.011

DO - 10.1016/j.jbiomech.2007.04.011

M3 - Journal articles

C2 - 17599340

VL - 40

SP - 3193

EP - 3200

JO - Journal of biomechanics

JF - Journal of biomechanics

SN - 0021-9290

IS - 14

ER -

ID: 18609