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J Rehabil Med. 2016 Nov 11;48(10):893-902. doi: 10.2340/16501977-2164.

Age-related test-retest reliability of isometric trunk torque measurements in patiens with chronic low back pain.

Author information

1
Karl Landsteiner Institute for Outpatient Rehabilitation Research,, Vienna, Austria. kienbacher@rehabzentrum.at.

Abstract

OBJECTIVE:

To investigate the short- and long-term reliability of isometric trunk strength measurements in patients with chronic low back pain in different age groups.

DESIGN:

Test-retest reliability study.

PATIENTS:

A total of 210 patients (age groups 18-39, 40-59 and 60-90 years).

METHODS:

Patients performed testing at baseline, 1-2 days (day 2) and 6 weeks.

RESULTS:

Only the oldest age group showed similar extension strength on all three test days All age groups showed significant changes in rotation and flexion scores from baseline to 6 weeks. Younger age groups (18-39 and 40-59 years) showed significant increases in extension, flexion, and rotation strength at both short-term (baseline to day 2) and long-term (baseline to 6 weeks) retests, but not from day 2 to 6 weeks. In patients over 60 years of age the smallest real differences normalized to baseline (%) were smaller from day 2 to 6 weeks than from baseline to 6 weeks. Long-term intraclass correlation coefficients were lowest between baseline and 6 weeks. No relevant impacts of feelings, motivation, or pain on reliability were detected.

CONCLUSION:

Reliability of isometric trunk strength measurements in patients with chronic low back pain is similar in older and younger patients. Short-term test repetition a few days after baseline is recommended, if clinically feasible, and especially in research evaluating the effects of exercise on strength.

PMID:
27735987
DOI:
10.2340/16501977-2164
[Indexed for MEDLINE]
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