Within- and between-day repeatability and variability in children's physiological responses during submaximal treadmill exercise.
The purpose of this study was to verify within- and between-day repeatability and variability in children's oxygen uptake (VO2), gross economy (GE; VO2 divided by speed) and heart rate (HR) during treadmill walking based on self-selected speed (SS). Fourteen children (10.1 +/- 1.4 years) undertook three testing sessions over 2 days in which four walking speeds, including SS were tested. Within- and between-day repeatability were assessed using the Bland and Altman method, and coefficients of variability (CV) were determined for each child across exercise bouts and averaged to obtain a mean group CV value for VO2, GE, and HR per speed. Repeated measures analysis of variance showed no statistically significant differences in within- or between-day CV for VO2, GE, or HR at any speed. Repeatability within- and between-day for VO2, GE, and HR for all speeds was verified. These results suggest that submaximal VO2 during treadmill walking is stable and reproducible at a range of speeds based on children's SS.
Amorim
Paulo R S
PR
Physical Education Department, Viçosa Federal University, Brazil. pramorim@ufv.br
Byrne
Nuala Mary
NM
Hills
Andrew P
AP
D000222:Adaptation, Physiological / Q000502:physiology*; D000367:Age Factors; D000704:Analysis of Variance; D002648:Child; D016001:Confidence Intervals; D005080:Exercise Test; D005260:Female; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D008297:Male; D010101:Oxygen Consumption / Q000502:physiology*; D015203:Reproducibility of Results; D013997:Time Factors; D016138:Walking / Q000502:physiology*