Test-Retest Reliability of Isokinetic Knee Strength Measurements in Children Aged 8 to 10 Years.
(2016) In Sports Health- Abstract
- BACKGROUND:
Isokinetic dynamometry is a useful tool to objectively assess muscle strength of children and adults in athletic and rehabilitative settings. This study examined test-retest reliability of isokinetic knee strength measurements in children aged 8 to 10 years and defined limits for the minimum difference (MD) in strength that indicates a clinically important change.
HYPOTHESIS:
Isokinetic knee strength measurements (using the Biodex System 4) in children will provide reliable results.
STUDY DESIGN:
Descriptive laboratory study.
METHODS:
In 22 healthy children, 5 maximal concentric (CON) knee extensor (KE) and knee flexor (KF)... (More) - BACKGROUND:
Isokinetic dynamometry is a useful tool to objectively assess muscle strength of children and adults in athletic and rehabilitative settings. This study examined test-retest reliability of isokinetic knee strength measurements in children aged 8 to 10 years and defined limits for the minimum difference (MD) in strength that indicates a clinically important change.
HYPOTHESIS:
Isokinetic knee strength measurements (using the Biodex System 4) in children will provide reliable results.
STUDY DESIGN:
Descriptive laboratory study.
METHODS:
In 22 healthy children, 5 maximal concentric (CON) knee extensor (KE) and knee flexor (KF) contractions at 2 angular velocities (60 deg/s and 180 deg/s) and 5 maximal eccentric (ECC) KE/KF contractions at 60 deg/s were assessed 7 days apart. The intraclass correlation coefficient (ICC2.1) was used to examine relative reliability, and the MD was calculated on the basis of standard error of measurement.
RESULTS:
ICCs for CON KE/KF peak torque measurements were fair to excellent (range, 0.49-0.81). The MD% values for CON KE and KF ranged from 31% to 37% at 60 deg/s and from 34% to 39% at 180 deg/s. ICCs in the ECC mode were good (range, 0.60-0.70), but associated MD% values were high (>50%). There was no systematic error for CON KE/KF and ECC KE strength measurements at 60 deg/s, but systematic error was found for all other measurements.
CONCLUSION:
The dynamometer provides a reliable analysis of isokinetic CON knee strength measurements at 60 deg/s in children aged 8 to 10 years. Measurements at 180 deg/s and in the ECC mode were not reliable, indicating a need for more familiarization prior to testing.
CLINICAL RELEVANCE:
The MD values may help clinicians to determine whether a change in knee strength is due to error or intervention. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/8825002
- author
- Fagher, Kristina LU ; Fritzson, Annelie and Drake, Anna Maria LU
- organization
- publishing date
- 2016-02-19
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Sports Health
- publisher
- SAGE Publications
- external identifiers
-
- pmid:26895853
- scopus:84964850038
- pmid:26895853
- wos:000391283300008
- ISSN
- 1941-0921
- DOI
- 10.1177/1941738116632506
- language
- English
- LU publication?
- yes
- id
- 351f02a1-cea3-46f1-b1b4-7176fee7b961 (old id 8825002)
- alternative location
- http://www.ncbi.nlm.nih.gov/pubmed/26895853?dopt=Abstract
- date added to LUP
- 2016-04-01 13:02:28
- date last changed
- 2025-04-04 13:59:55
@article{351f02a1-cea3-46f1-b1b4-7176fee7b961,
abstract = {{BACKGROUND:<br/><br>
<br/><br>
Isokinetic dynamometry is a useful tool to objectively assess muscle strength of children and adults in athletic and rehabilitative settings. This study examined test-retest reliability of isokinetic knee strength measurements in children aged 8 to 10 years and defined limits for the minimum difference (MD) in strength that indicates a clinically important change.<br/><br>
HYPOTHESIS:<br/><br>
<br/><br>
Isokinetic knee strength measurements (using the Biodex System 4) in children will provide reliable results.<br/><br>
STUDY DESIGN:<br/><br>
<br/><br>
Descriptive laboratory study.<br/><br>
METHODS:<br/><br>
<br/><br>
In 22 healthy children, 5 maximal concentric (CON) knee extensor (KE) and knee flexor (KF) contractions at 2 angular velocities (60 deg/s and 180 deg/s) and 5 maximal eccentric (ECC) KE/KF contractions at 60 deg/s were assessed 7 days apart. The intraclass correlation coefficient (ICC2.1) was used to examine relative reliability, and the MD was calculated on the basis of standard error of measurement.<br/><br>
RESULTS:<br/><br>
<br/><br>
ICCs for CON KE/KF peak torque measurements were fair to excellent (range, 0.49-0.81). The MD% values for CON KE and KF ranged from 31% to 37% at 60 deg/s and from 34% to 39% at 180 deg/s. ICCs in the ECC mode were good (range, 0.60-0.70), but associated MD% values were high (>50%). There was no systematic error for CON KE/KF and ECC KE strength measurements at 60 deg/s, but systematic error was found for all other measurements.<br/><br>
CONCLUSION:<br/><br>
<br/><br>
The dynamometer provides a reliable analysis of isokinetic CON knee strength measurements at 60 deg/s in children aged 8 to 10 years. Measurements at 180 deg/s and in the ECC mode were not reliable, indicating a need for more familiarization prior to testing.<br/><br>
CLINICAL RELEVANCE:<br/><br>
<br/><br>
The MD values may help clinicians to determine whether a change in knee strength is due to error or intervention.}},
author = {{Fagher, Kristina and Fritzson, Annelie and Drake, Anna Maria}},
issn = {{1941-0921}},
language = {{eng}},
month = {{02}},
publisher = {{SAGE Publications}},
series = {{Sports Health}},
title = {{Test-Retest Reliability of Isokinetic Knee Strength Measurements in Children Aged 8 to 10 Years.}},
url = {{http://dx.doi.org/10.1177/1941738116632506}},
doi = {{10.1177/1941738116632506}},
year = {{2016}},
}