Specificity of isokinetic assessment in noncontact knee injury prevention screening: A novel assessment procedure with relationships between variables in amateur adult agility-sport athletes

Nicholas C. Clark, Nicholas R. Heebner, Scott M. Lephart, Timothy C. Sell

Research output: Contribution to journalArticlepeer-review

Abstract

Objectives: To present a new knee isokinetic assessment procedure linked to noncontact knee injury mechanisms and examine correlations between variables relevant to noncontact knee injury prevention screening (peak torque [PT, Nm], time-to-peak torque [TTPT, ms], angle-of-peak torque [APT, °], mean PT [MPT, Nm]). Design: Cross-sectional. Setting: Sports medicine laboratory. Participants: Thirty-four agility-sport athletes (male/female n = 18/16, age 24.1 ± 3.5yr, height 171.8 ± 9.6 cm, mass 70.6 ± 12 kg). Main outcome measures: Pearson's/Spearman's correlation (r/rs), coefficient of determination (r2/rs2). Results: Most correlations were statistically non-significant or statistically-significant with only weak-to-moderate coefficients. For both knee extension and flexion, PT and MPT were significantly and strongly correlated (r = 0.99, r2 = 0.98, p = 0.001). Graphical analyses revealed two datapoint clusters for knee flexion TTPT and APT. One cluster indicated some participants could generate knee flexor PT rapidly (<150 ms) at low knee flexion angles (<45°) and the other cluster indicated that other participants could not (>200 ms, >50°). Conclusions: In this study, most isokinetic variables represented distinct knee neuromuscular characteristics. For both knee extension and flexion, only PT or MPT need be used to represent isokinetic maximal strength. Knee flexion TTPT and APT may have utility in noncontact knee injury prevention screening with amateur adult agility-sport athletes.

Original languageEnglish
Pages (from-to)105-114
Number of pages10
JournalPhysical Therapy in Sport
Volume53
DOIs
StatePublished - Jan 2022

Bibliographical note

Funding Information:
This research was performed when the authors were with the Neuromuscular Research Laboratory, School of Health and Rehabilitation Sciences, University of Pittsburgh, Pittsburgh, United States.

Publisher Copyright:
© 2021 Elsevier Ltd

Keywords

  • Injury prevention
  • Isokinetic
  • Knee
  • Screening

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

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