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Accuracy and Reliability of Onset Detection Algorithms in Gait Initiation for Healthy Controls and Participants With Parkinson’s Disease

Aisha Chen, Sandhya Selvaraj, Vennila Krishnan, and Shadnaz Asgari

[.41–1] .89 [.53–1] .90 [.58–1] .54 Abbreviations: AP, anteroposterior; ICC, intraclass correlation coefficient; ML, mediolateral. Table 3 Absolute Reliability (CV) Values as Mean (SD) Using Different Methods Method 1 Method 2 Method 3 Visual P value between the methods Healthy            ML 0.44 (0

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Reliability of Inversion and Eversion Peak- and Average-Torque Measurements from the Biodex System 3 Dynamometer

Thomas W. Kaminski and Geoff C. Dover


To determine the reliability of inversion and eversion concentric isokinetic-strength measurements from the Biodex System 3 isokinetic dynamometer.


University biomechanics research laboratory.


Thirty-five volunteers free from any lower leg and ankle injuries within the preceding year.


Peak (PT) and average (AT) isokinetic torque at 30°/s and 120°/s for subtalar-joint inversion and eversion.


PT intraclass correlation coefficients (ICC2,1) ranged from .54 to .92. AT ICC2,1 ranged from .55 to .91. These ICCs were good to excellent for both PT and AT at each speed and motion tested, except for fair ICCs produced from right-foot-eversion measurements at 30°/s.


Inversion and eversion subtalar-joint strength measurements from the Biodex System 3 isokinetic dynamometer are reliable.

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Reliability of the Active-Knee-Extension and Straight-Leg-Raise Tests in Subjects With Flexibility Deficits

Tiago Neto, Lia Jacobsohn, Ana I. Carita, and Raul Oliveira

Context: The active-knee-extension test (AKE) and the straight-leg-raise test (SLR) are widely used for flexibility assessment. A number of investigations have tested the reliability of these measures, especially the AKE. However, in most studies, the sample involved subjects with normal flexibility. In addition, few studies have determined the standard error of measurement (SEM) and minimal detectable difference (MDD), which can provide complementary and more clinically relevant information than the intraclass correlation coefficient (ICC) alone. Objectives: This study aimed to determine the AKE and LSR intrarater (test-retest) reliability in subjects with flexibility deficits, as well as the correlation between the 2 tests. Design: Reliability study. Setting: Academic laboratory. Subjects: 102 recreationally active participants (48 male, 54 female) with no injury to the lower limbs and with flexibility deficits in the hamstrings muscle group. Main Outcomes: Intrarater reliability was determined using the ICC, complemented by the SEM and MDD. Measures: All participants performed, in each lower limb, 2 trials of the AKE and the SLR. Results: The ICC values found for AKE and SLR tests were, respectively, .87-.94 and .93-.97. The values for SEM were low for both tests (2.6-2.9° for AKE, 2.2-2.6° for SLR), as well as the calculated MDD (7-8° for AKE, 6-7° for SLR). A moderate to strong, and significant, correlation between AKE and SLR was determined for the dominant limb (r = .71) and the nondominant limb (r = .67). Conclusions: These findings suggest that both AKE and SLR have excellent intrarater reliability. The SEMs and MDDs recorded are also very encouraging for the use of these tests in subjects with flexibility deficits.

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Reliability and Validity of the Clinometer Smartphone Application for Measuring Knee Flexion

Emilie N. Miley, Ashley J. Reeves, Russell T. Baker, Jayme Baker, and Samantha Hanna

clinometric measures on each knee, providing a total sample of 120 measurements for analysis. Statistical Analysis All data were analyzed using the Statistical Package for Social Sciences (SPSS, version 24, IBM Corp). To assess intrarater and interrater reliability, an intraclass correlation coefficient (ICC

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Test–Retest Reliability of Soccer Dribbling Tests in Children

Michael J. Duncan, Darren Richardson, Rhys Morris, Emma Eyre, and Neil D. Clarke

subsequent analysis. Statistical Analysis Intraclass correlation coefficients (two-way mixed model; Koo & Li, 2016 ) for each dribbling test were used to determine 2-week test–retest reliability, and the coefficient of variability was calculated to reflect the extent of variability in the data. A threshold

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Reliability of Knee Flexion–Extension Lyapunov Exponent in People With and Without Anterior Cruciate Ligament Deficiency

Salman Nazary-Moghadam, Mahyar Salavati, Ali Esteki, Behnam Akhbari, Sohrab Keyhani, and Afsaneh Zeinalzadeh

using the means of the 3 trials. The significance level was set at .05 for all statistical tests. In addition, relative reliability was assessed using the intraclass correlation coefficient (ICC) in 2-way random models. ICC 1 , 2 and ICC 2 , 3 were used to analyze intrasession and intersession

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How Many Valid Days Are Necessary to Assess Physical Activity Data From Accelerometry During Pregnancy?

Danilo Fernandes da Silva, Shuhiba Mohammad, Taniya Singh Nagpal, Sara Carolina Scremin Souza, Rachel C. Colley, and Kristi Bree Adamo

reported that wearing an accelerometer for at least 4 valid days presented high intraclass correlations coefficient (ICC, >.9) compared with 7 complete days in pregnant women during the second trimester. One issue with the 4-day guideline is that it can lead to smaller sample sizes and reduced power. To

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Psychometric Properties of the Turkish Adaptation of the Yale Physical Activity Survey

Erhan Seçer, İlknur Naz, Hilal Uzunlar, Gülşah Çallioğlu, Yusuf Emük, Melda Başer Seçer, and Hasan Öztin

indices are derived, 16–160 participants would be enough for our study in line with this recommendation. On the other hand, the original version included 75 participants ( Dipietro et al., 1993 ). It was stated that 21 participants were required with an intraclass correlation coefficient (ICC) estimated

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Test–Retest Reliability of Single-Leg Time to Stabilization Following a Drop-Landing Task in Healthy Individuals

Aaron Byrne, Clare Lodge, and Jennifer Wallace

. Statistical Analyses All data were tabulated and analyzed using IBM Statistical Package for the Social Sciences (SPSS, version 23, Armonk, NY) and Microsoft Excel 2013 (Redmond, WA). Means, SDs, coefficients of variance in percentage, and intraclass correlation coefficients (ICCs), along with the respective

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Reliability and Validity of the Sit-to-Stand as a Muscular Power Measure in Older Adults

Jennifer J. Sherwood, Cathy Inouye, Shannon L. Webb, and Jenny O

, with a 1-min rest between each trial. The highest value of the three trials from the right and left side were recorded and summed to yield maximal HGS. Data Analysis Intraclass correlation coefficient (ICC) is a measure of reliability that assesses both the degree of correlation (i.e., consistency) and