Validity and reliability of lower limb isokinetic unilateral muscle performance measures

Jones, Thomas, Howatson, Glyn, Russell, Mark and French, Duncan (2013) Validity and reliability of lower limb isokinetic unilateral muscle performance measures. Isokinetics and Exercise Science, 21 (4). pp. 311-316. ISSN 0959-3020

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Abstract

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.

Item Type:	Article
Uncontrolled Keywords:	Force production, unilateral, MVC, time to exhaustion, repeatability
Subjects:	C600 Sports Science
Department:	Faculties > Health and Life Sciences > Sport, Exercise and Rehabilitation
Depositing User:	Glyn Howatson
Date Deposited:	26 Mar 2013 11:34
Last Modified:	12 Oct 2019 16:25
URI:	http://nrl.northumbria.ac.uk/id/eprint/11562

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