Affiliations: [a] Department of Physical Therapy and Rehabilitation,
Ministry of Health Ankara, Diskapi Yildirim Beyazit Education and Research
Hospital, Ankara, Turkey
Note: [] Address for correspondence: Serdil Yuzer MD, Yeni Ziraat Mah.,
16. Sok. 21/13, Altindag, Ankara, Turkey. Tel.: +90 5053728023; E-mail:
serdilyuzer@gmail.com
Abstract: Objectives: To determine the intra-rater reproducibility of
normalized lifting strength (NLS) measurements. Methods: 30 healthy male
volunteers with a mean age of 28.16 ± 7.59 years participated in this
study. Each subject was tested by the same physician twice in a week, with at
least 48 hours between the test sessions. For the evaluation of intra-rater
reproducibility, intraclass correlation coefficients (ICC), the standard error
of measurement (SEM) and the smallest real difference (SRD) and Bland and
Altman method were used. Results: Intra-rater ICCs of the NLS were 0.77
and 0.67 at 19.4 and 38.9 cm/s, respectively. The SEM% were 13.2% and
20.1% while the SRD% were 36.6% and 55.8% at these velocities,
respectively. Conclusions: The reproducibility of NLS using the Biodex
Lift Simulation Attachment was moderate in terms of the ICC and low in terms of
the SRD. Thus the test, as described and applied is not sufficiently sensitive
to detect clinically relevant changes.
