Within- and between-day stability in locomotor energy use was quantified in 13 children with hemiplegic CP. During testing, subjects were familiarized with the laboratory environment (Session 1), performed three 5-min level treadmill walks (Trials 1, 2, and 3) at 0.67 m x s-1 (Session 2), and completed a single 5-min walk (Trial 4) at 0.67 m x s-1 (Session 3). In Sessions 2 and 3, HR was assessed and expired air was collected and analyzed to determine VO2. Data analyses revealed no significant difference (P > 0.05) in either net VO2 (ml x kg-1 x min-1) or EEIHR (b x m-1) across the three trials performed in Session 2 and between average measures of net VO2 and EEIHR quantified in Session 2 and those obtained in Session 3. Mean within-day coefficient of variation (CV) values for net VO2 and EEIHR were 8.6\% +/- 8.5\% and 13.9\% +/- 7.8\%, respectively. Analysis of between-day variability and energy expenditure revealed a between-day CV value of 13.1\% for net VO2 and 24.0\% for EEIHR. In addition, significant inverse relationships between GMFM scores and within-day (r = -0.61) and between-day (r = -0.58) CV values for net VO2 were detected. Viewed in concert, these data suggest that fairly stable within- and between-day measures of locomotor energy expenditure during level treadmill walking can be achieved in subjects with hemiplegic CP if testing is preceded by a short period of treadmill accommodation. However, children with greater motor dysfunction may require an extended period of treadmill accommodation to reduce trial-to-trial variability in walking energy use.
%0 Journal Article
%1 Keefer2005
%A Keefer, Daniel J
%A Wayland, Tseh
%A Caputo, Jennifer L
%A Apperson, Kathy
%A McGreal, Sheri
%A Morgan, Don W
%D 2005
%J Gait Posture
%K Adolescent; Cerebral Palsy; Child; Energy Metabolism; Female; Heart Rate; Hemiplegia; Humans; Male; Oxygen Consumption; Walking
%N 3
%P 177--181
%T Within- and between-day stability of treadmill walking VO2 in children with hemiplegic cerebral palsy. Stability of walking VO2 in children with CP.
%V 22
%X Within- and between-day stability in locomotor energy use was quantified in 13 children with hemiplegic CP. During testing, subjects were familiarized with the laboratory environment (Session 1), performed three 5-min level treadmill walks (Trials 1, 2, and 3) at 0.67 m x s-1 (Session 2), and completed a single 5-min walk (Trial 4) at 0.67 m x s-1 (Session 3). In Sessions 2 and 3, HR was assessed and expired air was collected and analyzed to determine VO2. Data analyses revealed no significant difference (P > 0.05) in either net VO2 (ml x kg-1 x min-1) or EEIHR (b x m-1) across the three trials performed in Session 2 and between average measures of net VO2 and EEIHR quantified in Session 2 and those obtained in Session 3. Mean within-day coefficient of variation (CV) values for net VO2 and EEIHR were 8.6\% +/- 8.5\% and 13.9\% +/- 7.8\%, respectively. Analysis of between-day variability and energy expenditure revealed a between-day CV value of 13.1\% for net VO2 and 24.0\% for EEIHR. In addition, significant inverse relationships between GMFM scores and within-day (r = -0.61) and between-day (r = -0.58) CV values for net VO2 were detected. Viewed in concert, these data suggest that fairly stable within- and between-day measures of locomotor energy expenditure during level treadmill walking can be achieved in subjects with hemiplegic CP if testing is preceded by a short period of treadmill accommodation. However, children with greater motor dysfunction may require an extended period of treadmill accommodation to reduce trial-to-trial variability in walking energy use.
@article{Keefer2005,
abstract = {Within- and between-day stability in locomotor energy use was quantified in 13 children with hemiplegic CP. During testing, subjects were familiarized with the laboratory environment (Session 1), performed three 5-min level treadmill walks (Trials 1, 2, and 3) at 0.67 m x s-1 (Session 2), and completed a single 5-min walk (Trial 4) at 0.67 m x s-1 (Session 3). In Sessions 2 and 3, HR was assessed and expired air was collected and analyzed to determine VO2. Data analyses revealed no significant difference (P > 0.05) in either net VO2 (ml x kg-1 x min-1) or EEIHR (b x m-1) across the three trials performed in Session 2 and between average measures of net VO2 and EEIHR quantified in Session 2 and those obtained in Session 3. Mean within-day coefficient of variation (CV) values for net VO2 and EEIHR were 8.6\% +/- 8.5\% and 13.9\% +/- 7.8\%, respectively. Analysis of between-day variability and energy expenditure revealed a between-day CV value of 13.1\% for net VO2 and 24.0\% for EEIHR. In addition, significant inverse relationships between GMFM scores and within-day (r = -0.61) and between-day (r = -0.58) CV values for net VO2 were detected. Viewed in concert, these data suggest that fairly stable within- and between-day measures of locomotor energy expenditure during level treadmill walking can be achieved in subjects with hemiplegic CP if testing is preceded by a short period of treadmill accommodation. However, children with greater motor dysfunction may require an extended period of treadmill accommodation to reduce trial-to-trial variability in walking energy use.},
added-at = {2014-07-19T20:35:43.000+0200},
author = {Keefer, Daniel J and Wayland, Tseh and Caputo, Jennifer L and Apperson, Kathy and McGreal, Sheri and Morgan, Don W},
biburl = {https://www.bibsonomy.org/bibtex/26d790331b98e0d429df054ade1c9353d/ar0berts},
groups = {public},
interhash = {5941e77e70f1dd105aa28dfd83255121},
intrahash = {6d790331b98e0d429df054ade1c9353d},
journal = {Gait Posture},
keywords = {Adolescent; Cerebral Palsy; Child; Energy Metabolism; Female; Heart Rate; Hemiplegia; Humans; Male; Oxygen Consumption; Walking},
month = Nov,
number = 3,
pages = {177--181},
pmid = {16278965},
timestamp = {2014-07-19T20:35:43.000+0200},
title = {Within- and between-day stability of treadmill walking VO2 in children with hemiplegic cerebral palsy. Stability of walking VO2 in children with CP.},
username = {ar0berts},
volume = 22,
year = 2005
}