Within- and Between-Day Repeatability and Variability in Children�s Physiological Responses During Submaximal Treadmill Exercise

• Autores: Paulo Roberto dos Santos Amorim, Nuala M. Byrne, Andrew P. Hills
• Localización: Research quarterly for exercise and sport, ISSN 0270-1367, Vol. 80, Nº. 3, 2009, págs. 575-582
• Idioma: inglés
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• Resumen

  • 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.