The oxygen uptake kinetic response to moderate intensity exercise in overweight and non-overweight children

Potter, Christopher R and Zakrzewski, J K and Draper, Stephen B and Unnithan, V B (2013) The oxygen uptake kinetic response to moderate intensity exercise in overweight and non-overweight children. International Journal of Obesity, 37 (1). pp. 101-106. ISSN 0307-0565

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Abstract

OBJECTIVE: To compare the phase II oxygen uptake time constant (tau V'O-2) and V'O-2 mean response time (V'O2MRT) in overweight (OW) and non-OW (NO) children during moderate intensity exercise. DESIGN: Between subjects where participants completed a maximal ramp exercise test on an electromagnetically braked cycle ergometer to determine peak V'O-2 (V'O-2peak) and gas exchange threshold (GET). Gas exchange was measured breath-by-breath using a mass spectrometer. On subsequent visits, 6 square-wave transitions (<= 2 per day) from 0W to 90% GET were completed. Individual phase II tau V'O-2 and V'O2MRTs were estimated from time aligned average V'O-2 traces. SUBJECTS: Eleven OW (11.8 +/- 0.4 years) and 12 NO (11.9 +/- 0.4 years) children were recruited to the study. The OW group was significantly heavier (62.9 +/- 9.7 vs 39.4 +/- 5.8 kg, P<0.001), taller (1.58 +/- 0.05 vs 1.47 +/- 0.07 m, P<0.001) and had a higher body mass index (25.8 +/- 3.4 vs 18.3 +/- 1.8 kg m(-2), P<0.001). RESULTS: Both tau V'O-2 (30.2 +/- 9.6 vs 22.8 +/- 7.1 s, P<0.05) and V'O2MRT (43.5 +/- 10.7 vs 36.3 +/- 5.3 s, P<0.05) were significantly slower in OW compared with NO children; absolute V'O-2peak was higher in the OW compared with NO group (2.23 +/- 0.04 vs 1.74 +/- 0.04 l min(-1), P<0.05); mass relative V'O-2peak was lower in OW compared with NO children (35.9 +/- 8.3 vs 43.8 +/- 6.2 ml kg(-1) min(-1), P<0.05); allometrically scaled V'O(2)peak was similar between OW and NO groups whether relative to body mass(0.67) (139.8 +/- 29.1 vs 147.2 +/- 23.9 ml kg(-67) min(-1)) or stature(3) (576.0 +/- 87.2 vs 544.9 +/- 84.9 ml m(-3) min(-1)) (P>0.05); absolute V'O-2 at GET was similar between OW and NO groups (0.94 +/- 0.24 vs 0.78 +/- 0.27 l min(-1), P>0.05); GET expressed as percentage of V'O-2peak was similar between the groups (42.0 +/- 0.1 vs 44.8 +/- 0.1%, P>0.05). CONCLUSION: These findings demonstrate impairment in the factors determining V'O-2 kinetics in OW children at a relatively young age. Furthermore, assessment of cardiorespiratory fitness using peak exercise values is likely to be misleading and not useful when designing exercise programmes for OW children.

Item Type: Article
Article Type: Article
Uncontrolled Keywords: Children; Overweight; Oxygen uptake kinetics; Peak oxygen uptake
Subjects: R Medicine > RJ Pediatrics > RJ370 Diseases of children and adolescents > RJ399.C6 Obesity in children
Divisions: Schools and Research Institutes > School of Sport & Exercise > Sport and Exercise
Research Priority Areas: Sport, Exercise, Health & Wellbeing
Depositing User: Susan Turner
Date Deposited: 07 Jun 2016 15:24
Last Modified: 07 Jun 2016 15:24
URI: http://eprints.glos.ac.uk/id/eprint/3592

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