TY - JOUR
T1 - Walking speed and spatiotemporal step mean measures are reliable during feedback-controlled treadmill walking; however, spatiotemporal step variability is not reliable
AU - Wiens, Casey
AU - Denton, William
AU - Schieber, Molly N.
AU - Hartley, Ryan
AU - Marmelat, Vivien
AU - Myers, Sara A.
AU - Yentes, Jennifer M.
N1 - Funding Information:
Funding was provided by University of Nebraska at Omaha Graduate Research and Creative Activity award , University of Nebraska at Omaha Fund for Undergraduate Scholarly Experiences, and NASA Nebraska Space Grant . Additional funding provided by the National Institutes of Health ( P20 GM109090 , R01AG034995 and R01HD090333 ).
Publisher Copyright:
© 2018 Elsevier Ltd
PY - 2019/1/23
Y1 - 2019/1/23
N2 - The purpose of the study was to compare the effects of a feedback-controlled treadmill (FeedbackTM) to a traditional fixed-speed treadmill (FixedTM) on spatiotemporal gait means, variability, and dynamics. The study also examined inter-session reliability when using the FeedbackTM. Ten young adults walked on the FeedbackTM for a 5-minute familiarization followed by a 16-minute experimental trial. They returned within one week and completed a 5-minute familiarization followed by a 16-minute experimental trial each for FeedbackTM and FixedTM conditions. Mean walking speed and step time, length, width, and speed means and coefficient of variation were calculated from all experimental conditions. Step time, length, width, and speed gait dynamics were analyzed using detrended fluctuation analysis. Mean differences between experimental trials were determined using ANOVAs and reliability between FeedbackTM sessions was determined by intraclass correlation coefficient. No difference was found in mean walking speed nor spatiotemporal variables, with the exception of step width, between the experimental trials. All mean spatiotemporal variables demonstrated good to excellent reliability between sessions, while coefficient of variation was not reliable. Gait dynamics of step time, length, width, and speed were significantly more persistent during the FeedbackTM condition compared to FixedTM, especially step speed. However, gait dynamics demonstrated fair to poor reliability between FeedbackTM sessions. When walking on the FeedbackTM, users maintain a consistent set point, yet the gait dynamics around the mean are different when compared to walking on a FixedTM. In addition, spatiotemporal gait dynamics and variability may not be consistent across separate days when using the FeedbackTM.
AB - The purpose of the study was to compare the effects of a feedback-controlled treadmill (FeedbackTM) to a traditional fixed-speed treadmill (FixedTM) on spatiotemporal gait means, variability, and dynamics. The study also examined inter-session reliability when using the FeedbackTM. Ten young adults walked on the FeedbackTM for a 5-minute familiarization followed by a 16-minute experimental trial. They returned within one week and completed a 5-minute familiarization followed by a 16-minute experimental trial each for FeedbackTM and FixedTM conditions. Mean walking speed and step time, length, width, and speed means and coefficient of variation were calculated from all experimental conditions. Step time, length, width, and speed gait dynamics were analyzed using detrended fluctuation analysis. Mean differences between experimental trials were determined using ANOVAs and reliability between FeedbackTM sessions was determined by intraclass correlation coefficient. No difference was found in mean walking speed nor spatiotemporal variables, with the exception of step width, between the experimental trials. All mean spatiotemporal variables demonstrated good to excellent reliability between sessions, while coefficient of variation was not reliable. Gait dynamics of step time, length, width, and speed were significantly more persistent during the FeedbackTM condition compared to FixedTM, especially step speed. However, gait dynamics demonstrated fair to poor reliability between FeedbackTM sessions. When walking on the FeedbackTM, users maintain a consistent set point, yet the gait dynamics around the mean are different when compared to walking on a FixedTM. In addition, spatiotemporal gait dynamics and variability may not be consistent across separate days when using the FeedbackTM.
KW - Detrended fluctuation analysis
KW - Feedback-controlled treadmill
KW - Gait dynamics
KW - Reliability
KW - Self-paced treadmill
UR - http://www.scopus.com/inward/record.url?scp=85058013654&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85058013654&partnerID=8YFLogxK
U2 - 10.1016/j.jbiomech.2018.11.051
DO - 10.1016/j.jbiomech.2018.11.051
M3 - Article
C2 - 30551920
AN - SCOPUS:85058013654
VL - 83
SP - 221
EP - 226
JO - Journal of Biomechanics
JF - Journal of Biomechanics
SN - 0021-9290
ER -