The efficacy of a discontinuous graded exercise test in measuring peak oxygen uptake in children aged 8 to 10 years

D Lambrick; J Jakeman; R Grigg; S Kaufmann; J Faulkner

doi:10.5114/biolsport.2017.63734

eISSN: 2083-1862
ISSN: 0860-021X

Biology of Sport

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abstract:

Original paper

The efficacy of a discontinuous graded exercise test in measuring peak oxygen uptake in children aged 8 to 10 years

D Lambrick

¹

,

J Jakeman

²

,

R Grigg

³

,

S Kaufmann

⁴

,

J Faulkner

⁵

Faculty of Health Sciences, University of Southampton, UK
Department of Sport and Health Sciences, Oxford Brookes University, UK
School of Sport and Exercise, Massey University, NZ
Faculty of Philosophy II, Julius Maximilians University, Würzburg, 97074, Germany
Department of Sport and Exercise, University of Winchester, UK

Biol. Sport 2017;34:57-61

DOI: https://doi.org/10.5114/biolsport.2017.63734

Online publish date: 2016/12/09

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As children’s natural activity patterns are highly intermittent in nature, and characterised by rapid changes from rest to vigorous physical activity, discontinuous exercise tests may be considered ecologically valid for this population group. This study compared the peak physiological responses from a discontinuous and continuous graded exercise test (GXT_D, GXT_C, respectively) during treadmill exercise in children. Twenty-one healthy children (9.6 ± 0.6 y) completed GXT_D and GXT_C in a randomised order, separated by 72-hours. Following each GXT, and after a 15-minute recovery, participants completed a verification test at 105% of the velocity attained at peak oxygen consumption (VO₂peak). There were no differences in VO₂peak (55.3 ± 8.2 cf. 54.4 ± 7.6 mL•kg-1•min-1) or maximal heart rate (202 ± 10 cf. 204 ± 8 b•min-1) between GXT_C and GXT_D, respectively (P>.05). Peak running speed (10.7 ± 0.9 cf. 12.1 ± 1.3 km•h-1) and respiratory exchange ratio (1.04 ± 0.05 cf. 0.92 ± 0.05) were however different between tests (P<.001). Although similar peak physiological values were revealed between GXT_C and the corresponding verification test (P>.05), VO₂peak (53.3 ± 7.3 mL•kg-1•min-1) and heart rate (197 ± 13 b•min-1) were significantly lower in the GXT_D verification test (P<.05). In conclusion, a discontinuous GXT is an accurate measure of VO₂peak in children aged 8 to 10 years and may be a valid alternative to a continuous GXT, despite its longer duration.

keywords:

The efficacy of a discontinuous graded exercise test in measuring peak oxygen uptake in children aged 8 to 10 years

D Lambrick 1 , J Jakeman 2 , R Grigg 3 , S Kaufmann 4 , J Faulkner 5

VO2peak, Paediatric exercise, Discontinuous exercise, Continuous exercise

D Lambrick

¹

,

J Jakeman

²

,

R Grigg

³

,

S Kaufmann

⁴

,

J Faulkner

⁵

VO₂peak, Paediatric exercise, Discontinuous exercise, Continuous exercise