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Oxygen uptake kinetics in overweight and non-overweight children during moderate intensity non-weight bearing exercise

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Zakrzewski, Julia K (2008) Oxygen uptake kinetics in overweight and non-overweight children during moderate intensity non-weight bearing exercise. Masters thesis, University of Gloucestershire.

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Official URL: https://eprints.glos.ac.uk/id/eprint/10602

Abstract

The increasing levels of paediatric overweight and obesity in England and throughout the world has created a need for research that may be implemented within weight management regimes in this population. Studying the oxygen uptake ( V02 ) kinetic response during exercise reflects the combined control of the cardiovascular, pulmonary and metabolic systems and provides information during a metabolic state that mimics habitual activity more closely than traditional steady-state exercise. The aim of the present study was to determine the V02 kinetic response to moderate intensity non-weight bearing exercise in overweight (OW) and non-overweight (NO) children, by assessing the V02 time constant (1:V02 ) and V02 mean response time (V02 MRT). The study sample consisted of 10 OW children (age 11.9 ± 0.3 y, BMI 25.2 ± 3.5 kg·m-2) and 12 NO children (age 11.9 ± 0.4 y, BMI 18.3 ± 1.8 kg·m-2). Each subject completed a peak V02 test followed by 6 exercise transitions, from unloaded pedaling to a constant work rate corresponding to 90% of the individually determined ventilatory threshold. The breath-by-breath responses for each subject were interpolated to 1 s intervals, time aligned and averaged. A single exponential model that included a time delay was fit to the averaged response following phase 1 to quantify the ,: V02 A single exponential model with no delay term was fit to the averaged response from exercise onset to calculate the V02 MRT. There was a trend for a slower V02 kinetic response in the OW compared to NO children, as reflected by the ,: V02 (OW 30.1 ± 10.1 s, NO 22.8 ± 7.1 s) and V02 MRT (OW 43.4 ± 11.2 s, NO 36.3 ± 5.3 s). However, this trend failed to reach statistical significance (P<0.05) for ,:V02 (P=0.060) and V02 MRT (P=0.067). Post-hoe analysis suggested that 1) the non-significant findings were due to the high inter-individual variability of the sample and 2) it is possible for individual OW children to exhibit remarkably fast V02 kinetic responses. Consequently, there is a need for research including larger sample sizes to increase the statistical power and potentially demonstrate a significant difference in the V02 kinetic response between OW and NO children.

Item Type:

Thesis (Masters)

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