Comparing passive angle-torque curves recorded simultaneously with a load cell versus an isokinetic dynamometer during dorsiflexion stretch tolerance assessments

Samuel L. Buckner, Nathaniel D.M. Jenkins, Pablo B. Costa, Eric D. Ryan, Trent J. Herda, Joel T. Cramer

Research output: Contribution to journalArticle

Abstract

The purpose of the present study was to compare the passive angle-torque curves and the passive stiffness (PS, Nm°-1) values recorded simultaneously from a load cell versus an isokinetic dynamometer during dorsiflexion stretch tolerance assessments in vivo. Nine healthy men (mean±SD age=21.4±1.6 years) completed stretch tolerance assessments on a custom-built apparatus where passive torque was measured simultaneously from an isokinetic dynamometer and a load cell. Passive torque values that corresponded with the last 10° of dorsiflexion, verified by surface electromyographic amplitude, were analyzed for each device (θ1, θ2, θ3, . . ., θ10). Passive torque values measured with the load cell were greater (p≤0.05) than the dynamometer torque values for θ4 through θ10. There were more statistical differentiations among joint angles for passive torque measured by the load cell, and the load cell measured a greater (p≤0.01) increase in passive torque and PS than the isokinetic dynamometer. These findings suggested that when examining the angle-torque curves from passive dorsiflexion stretch tolerance tests, a load cell placed under the distal end of the foot may be more sensitive than the torque recorded from an isokinetic dynamometer.

Original languageEnglish (US)
Pages (from-to)494-498
Number of pages5
JournalMedical Engineering and Physics
Volume37
Issue number5
DOIs
StatePublished - May 1 2015

Fingerprint

Dynamometers
Torque
Loads (forces)
Foot
Joints
Stiffness
Equipment and Supplies

Keywords

  • Muscle-tendon unit
  • Passive stiffness
  • Stretching
  • Viscoelastic

ASJC Scopus subject areas

  • Biophysics
  • Biomedical Engineering

Cite this

Comparing passive angle-torque curves recorded simultaneously with a load cell versus an isokinetic dynamometer during dorsiflexion stretch tolerance assessments. / Buckner, Samuel L.; Jenkins, Nathaniel D.M.; Costa, Pablo B.; Ryan, Eric D.; Herda, Trent J.; Cramer, Joel T.

In: Medical Engineering and Physics, Vol. 37, No. 5, 01.05.2015, p. 494-498.

Research output: Contribution to journalArticle

Buckner, Samuel L. ; Jenkins, Nathaniel D.M. ; Costa, Pablo B. ; Ryan, Eric D. ; Herda, Trent J. ; Cramer, Joel T. / Comparing passive angle-torque curves recorded simultaneously with a load cell versus an isokinetic dynamometer during dorsiflexion stretch tolerance assessments. In: Medical Engineering and Physics. 2015 ; Vol. 37, No. 5. pp. 494-498.
@article{cea671f3cb6d450183994cf710940c84,
title = "Comparing passive angle-torque curves recorded simultaneously with a load cell versus an isokinetic dynamometer during dorsiflexion stretch tolerance assessments",
abstract = "The purpose of the present study was to compare the passive angle-torque curves and the passive stiffness (PS, Nm°-1) values recorded simultaneously from a load cell versus an isokinetic dynamometer during dorsiflexion stretch tolerance assessments in vivo. Nine healthy men (mean±SD age=21.4±1.6 years) completed stretch tolerance assessments on a custom-built apparatus where passive torque was measured simultaneously from an isokinetic dynamometer and a load cell. Passive torque values that corresponded with the last 10° of dorsiflexion, verified by surface electromyographic amplitude, were analyzed for each device (θ1, θ2, θ3, . . ., θ10). Passive torque values measured with the load cell were greater (p≤0.05) than the dynamometer torque values for θ4 through θ10. There were more statistical differentiations among joint angles for passive torque measured by the load cell, and the load cell measured a greater (p≤0.01) increase in passive torque and PS than the isokinetic dynamometer. These findings suggested that when examining the angle-torque curves from passive dorsiflexion stretch tolerance tests, a load cell placed under the distal end of the foot may be more sensitive than the torque recorded from an isokinetic dynamometer.",
keywords = "Muscle-tendon unit, Passive stiffness, Stretching, Viscoelastic",
author = "Buckner, {Samuel L.} and Jenkins, {Nathaniel D.M.} and Costa, {Pablo B.} and Ryan, {Eric D.} and Herda, {Trent J.} and Cramer, {Joel T.}",
year = "2015",
month = "5",
day = "1",
doi = "10.1016/j.medengphy.2015.02.010",
language = "English (US)",
volume = "37",
pages = "494--498",
journal = "Medical Engineering and Physics",
issn = "1350-4533",
publisher = "Elsevier BV",
number = "5",

}

TY - JOUR

T1 - Comparing passive angle-torque curves recorded simultaneously with a load cell versus an isokinetic dynamometer during dorsiflexion stretch tolerance assessments

AU - Buckner, Samuel L.

AU - Jenkins, Nathaniel D.M.

AU - Costa, Pablo B.

AU - Ryan, Eric D.

AU - Herda, Trent J.

AU - Cramer, Joel T.

PY - 2015/5/1

Y1 - 2015/5/1

N2 - The purpose of the present study was to compare the passive angle-torque curves and the passive stiffness (PS, Nm°-1) values recorded simultaneously from a load cell versus an isokinetic dynamometer during dorsiflexion stretch tolerance assessments in vivo. Nine healthy men (mean±SD age=21.4±1.6 years) completed stretch tolerance assessments on a custom-built apparatus where passive torque was measured simultaneously from an isokinetic dynamometer and a load cell. Passive torque values that corresponded with the last 10° of dorsiflexion, verified by surface electromyographic amplitude, were analyzed for each device (θ1, θ2, θ3, . . ., θ10). Passive torque values measured with the load cell were greater (p≤0.05) than the dynamometer torque values for θ4 through θ10. There were more statistical differentiations among joint angles for passive torque measured by the load cell, and the load cell measured a greater (p≤0.01) increase in passive torque and PS than the isokinetic dynamometer. These findings suggested that when examining the angle-torque curves from passive dorsiflexion stretch tolerance tests, a load cell placed under the distal end of the foot may be more sensitive than the torque recorded from an isokinetic dynamometer.

AB - The purpose of the present study was to compare the passive angle-torque curves and the passive stiffness (PS, Nm°-1) values recorded simultaneously from a load cell versus an isokinetic dynamometer during dorsiflexion stretch tolerance assessments in vivo. Nine healthy men (mean±SD age=21.4±1.6 years) completed stretch tolerance assessments on a custom-built apparatus where passive torque was measured simultaneously from an isokinetic dynamometer and a load cell. Passive torque values that corresponded with the last 10° of dorsiflexion, verified by surface electromyographic amplitude, were analyzed for each device (θ1, θ2, θ3, . . ., θ10). Passive torque values measured with the load cell were greater (p≤0.05) than the dynamometer torque values for θ4 through θ10. There were more statistical differentiations among joint angles for passive torque measured by the load cell, and the load cell measured a greater (p≤0.01) increase in passive torque and PS than the isokinetic dynamometer. These findings suggested that when examining the angle-torque curves from passive dorsiflexion stretch tolerance tests, a load cell placed under the distal end of the foot may be more sensitive than the torque recorded from an isokinetic dynamometer.

KW - Muscle-tendon unit

KW - Passive stiffness

KW - Stretching

KW - Viscoelastic

UR - http://www.scopus.com/inward/record.url?scp=84928203184&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84928203184&partnerID=8YFLogxK

U2 - 10.1016/j.medengphy.2015.02.010

DO - 10.1016/j.medengphy.2015.02.010

M3 - Article

C2 - 25782330

AN - SCOPUS:84928203184

VL - 37

SP - 494

EP - 498

JO - Medical Engineering and Physics

JF - Medical Engineering and Physics

SN - 1350-4533

IS - 5

ER -