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

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Keywords

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

ASJC Scopus subject areas

  • Biophysics
  • Biomedical Engineering

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