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The role of agonist and antagonist muscles in explaining isometric knee extension torque variation with hip joint angle

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The role of agonist and antagonist muscles in explaining isometric knee extension torque variation with hip joint angle. / Bampouras, Theodoros M.; Reeves, Neil D.; Baltzopoulos, Vasilios et al.

In: European Journal of Applied Physiology, Vol. 117, No. 10, 10.2017, p. 2039-2045.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Harvard

Bampouras, TM, Reeves, ND, Baltzopoulos, V & Maganaris, CN 2017, 'The role of agonist and antagonist muscles in explaining isometric knee extension torque variation with hip joint angle', European Journal of Applied Physiology, vol. 117, no. 10, pp. 2039-2045. https://doi.org/10.1007/s00421-017-3693-y

APA

Bampouras, T. M., Reeves, N. D., Baltzopoulos, V., & Maganaris, C. N. (2017). The role of agonist and antagonist muscles in explaining isometric knee extension torque variation with hip joint angle. European Journal of Applied Physiology, 117(10), 2039-2045. https://doi.org/10.1007/s00421-017-3693-y

Vancouver

Bampouras TM, Reeves ND, Baltzopoulos V, Maganaris CN. The role of agonist and antagonist muscles in explaining isometric knee extension torque variation with hip joint angle. European Journal of Applied Physiology. 2017 Oct;117(10):2039-2045. Epub 2017 Aug 12. doi: 10.1007/s00421-017-3693-y

Author

Bampouras, Theodoros M. ; Reeves, Neil D. ; Baltzopoulos, Vasilios et al. / The role of agonist and antagonist muscles in explaining isometric knee extension torque variation with hip joint angle. In: European Journal of Applied Physiology. 2017 ; Vol. 117, No. 10. pp. 2039-2045.

Bibtex

@article{97ee60cc2c654d28b1764dc4034e3219,
title = "The role of agonist and antagonist muscles in explaining isometric knee extension torque variation with hip joint angle",
abstract = "PurposeThe biarticular rectus femoris (RF), operating on the ascending limb of the force–length curve, produces more force at longer lengths. However, experimental studies consistently report higher knee extension torque when supine (longer RF length) compared to seated (shorter RF length). Incomplete activation in the supine position has been proposed as the reason for this discrepancy, but differences in antagonistic co-activation could also be responsible due to altered hamstrings length. We examined the role of agonist and antagonist muscles in explaining the isometric knee extension torque variation with changes in hip joint angle.MethodMaximum voluntary isometric knee extension torque (joint MVC) was recorded in seated and supine positions from nine healthy males (30.2 ± 7.7 years). Antagonistic torque was estimated using EMG and added to the respective joint MVC (corrected MVC). Submaximal tetanic stimulation quadriceps torque was also recorded.ResultJoint MVC was not different between supine (245 ± 71.8 Nm) and seated (241 ± 69.8 Nm) positions and neither was corrected MVC (257 ± 77.7 and 267 ± 87.0 Nm, respectively). Antagonistic torque was higher when seated (26 ± 20.4 Nm) than when supine (12 ± 7.4 Nm). Tetanic torque was higher when supine (111 ± 31.9 Nm) than when seated (99 ± 27.5 Nm).ConclusionAntagonistic co-activation differences between hip positions do not account for the reduced MVC in the supine position. Rather, reduced voluntary knee extensor muscle activation in that position is the major reason for the lower MVC torque when RF is lengthened (hip extended). These findings can assist standardising muscle function assessment and improving musculoskeletal modelling applications.",
keywords = "Electrical muscle stimulation, Muscle activation capacity, Quadriceps function, Seated torque, Supine torque",
author = "Bampouras, {Theodoros M.} and Reeves, {Neil D.} and Vasilios Baltzopoulos and Maganaris, {Constantinos N.}",
note = "The final publication is available at Springer via http://dx.doi.org/10.1007/s00421-017-3693-y",
year = "2017",
month = oct,
doi = "10.1007/s00421-017-3693-y",
language = "English",
volume = "117",
pages = "2039--2045",
journal = "European Journal of Applied Physiology",
issn = "1439-6319",
publisher = "Springer Verlag",
number = "10",

}

RIS

TY - JOUR

T1 - The role of agonist and antagonist muscles in explaining isometric knee extension torque variation with hip joint angle

AU - Bampouras, Theodoros M.

AU - Reeves, Neil D.

AU - Baltzopoulos, Vasilios

AU - Maganaris, Constantinos N.

N1 - The final publication is available at Springer via http://dx.doi.org/10.1007/s00421-017-3693-y

PY - 2017/10

Y1 - 2017/10

N2 - PurposeThe biarticular rectus femoris (RF), operating on the ascending limb of the force–length curve, produces more force at longer lengths. However, experimental studies consistently report higher knee extension torque when supine (longer RF length) compared to seated (shorter RF length). Incomplete activation in the supine position has been proposed as the reason for this discrepancy, but differences in antagonistic co-activation could also be responsible due to altered hamstrings length. We examined the role of agonist and antagonist muscles in explaining the isometric knee extension torque variation with changes in hip joint angle.MethodMaximum voluntary isometric knee extension torque (joint MVC) was recorded in seated and supine positions from nine healthy males (30.2 ± 7.7 years). Antagonistic torque was estimated using EMG and added to the respective joint MVC (corrected MVC). Submaximal tetanic stimulation quadriceps torque was also recorded.ResultJoint MVC was not different between supine (245 ± 71.8 Nm) and seated (241 ± 69.8 Nm) positions and neither was corrected MVC (257 ± 77.7 and 267 ± 87.0 Nm, respectively). Antagonistic torque was higher when seated (26 ± 20.4 Nm) than when supine (12 ± 7.4 Nm). Tetanic torque was higher when supine (111 ± 31.9 Nm) than when seated (99 ± 27.5 Nm).ConclusionAntagonistic co-activation differences between hip positions do not account for the reduced MVC in the supine position. Rather, reduced voluntary knee extensor muscle activation in that position is the major reason for the lower MVC torque when RF is lengthened (hip extended). These findings can assist standardising muscle function assessment and improving musculoskeletal modelling applications.

AB - PurposeThe biarticular rectus femoris (RF), operating on the ascending limb of the force–length curve, produces more force at longer lengths. However, experimental studies consistently report higher knee extension torque when supine (longer RF length) compared to seated (shorter RF length). Incomplete activation in the supine position has been proposed as the reason for this discrepancy, but differences in antagonistic co-activation could also be responsible due to altered hamstrings length. We examined the role of agonist and antagonist muscles in explaining the isometric knee extension torque variation with changes in hip joint angle.MethodMaximum voluntary isometric knee extension torque (joint MVC) was recorded in seated and supine positions from nine healthy males (30.2 ± 7.7 years). Antagonistic torque was estimated using EMG and added to the respective joint MVC (corrected MVC). Submaximal tetanic stimulation quadriceps torque was also recorded.ResultJoint MVC was not different between supine (245 ± 71.8 Nm) and seated (241 ± 69.8 Nm) positions and neither was corrected MVC (257 ± 77.7 and 267 ± 87.0 Nm, respectively). Antagonistic torque was higher when seated (26 ± 20.4 Nm) than when supine (12 ± 7.4 Nm). Tetanic torque was higher when supine (111 ± 31.9 Nm) than when seated (99 ± 27.5 Nm).ConclusionAntagonistic co-activation differences between hip positions do not account for the reduced MVC in the supine position. Rather, reduced voluntary knee extensor muscle activation in that position is the major reason for the lower MVC torque when RF is lengthened (hip extended). These findings can assist standardising muscle function assessment and improving musculoskeletal modelling applications.

KW - Electrical muscle stimulation

KW - Muscle activation capacity

KW - Quadriceps function

KW - Seated torque

KW - Supine torque

U2 - 10.1007/s00421-017-3693-y

DO - 10.1007/s00421-017-3693-y

M3 - Journal article

VL - 117

SP - 2039

EP - 2045

JO - European Journal of Applied Physiology

JF - European Journal of Applied Physiology

SN - 1439-6319

IS - 10

ER -