Reliability of Isokinetic Strength Assessments of Knee and Hip Using the Biodex System 4 Dynamometer and Associations With Functional Strength in Healthy Children.

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van Tittelboom V., Alemdaroglu-Guerbuez İ., Hanssen B., Heyrman L., Feys H., Desloovere K., ...More

Frontiers in sports and active living, vol.4, pp.817216, 2022 (ESCI) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 4
  • Publication Date: 2022
  • Doi Number: 10.3389/fspor.2022.817216
  • Journal Name: Frontiers in sports and active living
  • Journal Indexes: Emerging Sources Citation Index (ESCI), Scopus, Directory of Open Access Journals
  • Page Numbers: pp.817216
  • Keywords: isokinetic dynamometry, lower limbs, children, reliability, functional strength, TEST-RETEST RELIABILITY, QUADRICEPS STRENGTH, REPRODUCIBILITY, EXERCISE, VALIDITY, SCORES, GAIT
  • Hacettepe University Affiliated: Yes


BackgroundThis study aimed to analyze the reliability of concentric isokinetic strength assessments (knee and hip) using the Biodex System 4 in healthy children and assess the association with functional strength tests (sit-to-stand [STS], lateral-step-up [LSU]). Methods19 children (6-12 years) were included. Knee and hip flexion and extension, and hip abduction and adduction were tested at 60 and 90 degrees/s. ResultsRelative and absolute reliability at 60 degrees/s tended to show better results compared to those at 90 degrees/s. Intra class correlations (ICCs) of knee flexion and extension at 60 degrees/s were good (0.79-0.89). For hip flexion, extension, abduction and adduction at 60 degrees/s ICCs were moderate to good (0.53-0.83). The smallest detectable change (SDC) values (expressed in %) were highly variable. The SDC% for knee flexion and extension and hip abduction at 60 degrees/s were around 50%. Positive associations were found between hip extension and abduction isokinetic strength and the STS test. ConclusionConcentric isokinetic strength assessments in healthy children using the Biodex System 4 were found reliable for knee flexion and extension and hip abduction. Limited associations were found between concentric isokinetic strength tests and functional strength tests.