Abstract
BackgroundRecently, there has been growing interest in using smartphone applications to assess gait speed and quantify isometric core stability exercise intensity. The purpose of this study was to investigate the between-session reliability and minimal detectable change of a smartphone app for two dynamic exercise tests of the lumbopelvic complex.MethodsThirty-three healthy young and active students (age: 22.3 ± 5.9 years, body weight: 66.9 ± 11.3 kg, height: 167.8 ± 10.3 cm) participated in this study. Intraclass correlation coefficient (ICC), coefficient of variation (%CV), and Bland–Altman plots were used to verify the reliability of the test. The standard error of measurement (SEM) and the minimum detectable difference (MDD) were calculated for clinical applicability.ResultsThe ICCs ranged from 0.73 to 0.96, with low variation (0.9% to 4.8%) between days of assessments. The Bland–Altman plots and one-sample t-tests (p > 0.05) indicated that no dynamic exercise tests changed systematically. Our analyses showed that SEM 0.6 to 1.5 mm/s-2) and MDD (2.1 to 3.5 mm/s-2).ConclusionThe OCTOcore app is a reliable tool to assess core stability for two dynamic exercises. A minimal change of 3.5 mm/s-2 is needed to be confident that the change is not a measurement error between two sessions.
Highlights
Core stability has been defined as ‘‘the capacity of the stabilizing system to maintain the intervertebral neutral zones within physiological limitations’’ (Panjabi, 1992)
According to the random order given by the app, ‘‘grey left’’ or ‘‘green right,’’ participants would raise their right or left arms to the side following the direction of the OctoBalance R line while stretching the opposite leg with ankle dorsi-flexion (Fig. 2)
T -tests, ICCs, d, CV%, SEM and minimum detectable difference (MDD) between the first and second assessments are presented on Table 1
Summary
Core stability has been defined as ‘‘the capacity of the stabilizing system to maintain the intervertebral neutral zones within physiological limitations’’ (Panjabi, 1992). Test-retest reliability of a smartphone app for measuring core stability for two dynamic exercises. Typical laboratory testing often uses sophisticated equipment, such as 3D tracking systems, force plates, and timing gates (Manor et al, 2018) These devices are highly valid and reliable, their expense and size make them unaffordable for use outside of a research laboratory. There has been growing interest in using smartphone applications to assess gait speed and quantify isometric core stability exercise intensity (Barbado et al, 2018; Silsupadol, Teja & Lugade, 2017). The literature lacks studies on the reliability of smartphone apps for measuring core stability. The objective of the present study was to investigate the between-session reliability and minimal detectable change of the OCTOcore app for two dynamic exercise tests of the lumbopelvic complex
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