Validity and reliability of lower limb isokinetic unilateral muscle performance measures

Thomas Jones, Glyn Howatson, Mark Russell, Duncan French

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


BACKGROUND: There are few standardised assessments of unilateral muscular endurance and little data examining the validity and reproducibility of isokinetic unilateral muscular endurance performance measures. OBJECTIVE: To examine the validity and reproducibility of an isokinetic assessment of lower limb unilateral muscular endurance performance. METHODS: Thirty individuals (15 endurance trained and 15 non-endurance trained) repeated a time to exhaustion (TTE) based endurance protocol on separate days. Procedures were conducted on an isokinetic dynamometer and involved leg extension through 135° of the dominant leg. The TTE protocol required participants to perform unilateral isokinetic leg extensions at 60% of individual maximal voluntary contraction (MVC) until the specified intensity and frequency could not be maintained. RESULTS: The endurance trained individuals reached significantly greater TTE than their non-endurance trained counterparts (P< 0.001). Systemic bias was small (< 5%) and measures were similar between trials. Test-retest reproducibility statistics were as follows; CV: 6.9%; LOA −170.1 to 139.5; RLOA: −0.320 ×/÷ 0.257. Relative reproducibility statistics were tight between trials (significant correlation P< 0.001). CONCLUSIONS: Data demonstrate the validity and tight test-retest reproducibility of the aforementioned assessment of unilateral muscular endurance performance.
Original languageEnglish
Pages (from-to)311-316
Number of pages6
JournalIsokinetics and Exercise Science
Issue number4
Publication statusPublished - 12 Sept 2013
Externally publishedYes


  • Force production
  • unilateral
  • MVC
  • time to exhaustion
  • repeatability


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