کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6206418 | 1265646 | 2014 | 6 صفحه PDF | دانلود رایگان |
- Young adults responded to three progressive series of treadmill accelerations.
- Subjects were instructed to either try “not to step” or “to take only one step”.
- Anteroposterior single-stepping and multiple-stepping thresholds were identified.
- Lateral single-stepping thresholds were identified.
- Thresholds demonstrated excellent intrarater reliability (ICC (2,1)Â =Â 0.87-0.97).
The purpose of this study was to evaluate the test-retest, intra-rater reliability and agreement of compensatory stepping thresholds. A protocol was developed to establish anteroposterior single-stepping thresholds, anteroposterior multiple-stepping thresholds, and lateral single-stepping thresholds. Healthy, young subjects stood on a microprocessor-controlled treadmill, and responded to three series of progressively challenging surface translations. Subjects were instructed to “try not to step” when establishing single-stepping thresholds or “try to take only one step” when establishing multiple-stepping thresholds. Stepping thresholds were defined as the minimum disturbance magnitude that consistently elicited a single or second compensatory step. Thresholds were expressed as the ankle torque necessary to maintain upright posture. Thresholds studied included anterior single-stepping thresholds (Ï = 273.0 ± 82.3 N m), posterior single-stepping, thresholds (Ï = 235.5 ± 98.0 N m), anterior multiple-stepping thresholds (Ï = 977.0 ± 416.3 N m), posterior multiple-stepping thresholds (Ï = 701.9 ± 237.5 N m), stability-side lateral single-stepping thresholds (Ï = 225.7 ± 77.7 N m), and mobility-side lateral single-stepping thresholds (Ï = 236.8 ± 85.4 N m). Based on intraclass correlation coefficients (ICC) and Bland-Altman plots, all thresholds demonstrated excellent reliability (ICC(2,1) = 0.87-0.97) and agreement. These results suggest that compensatory stepping thresholds have sufficient repeatability to be used in clinical and research-related assessments of fall-risk. Additional study is needed to determine the intra- and inter-rater reliabilities and validity of thresholds specific to the patient populations of interest.
Journal: Gait & Posture - Volume 39, Issue 2, February 2014, Pages 810-815