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

The efficacy of a discontinuous graded exercise test in measuring peak oxygen uptake in children aged 8 to 10 years
The efficacy of a discontinuous graded exercise test in measuring peak oxygen uptake in children aged 8 to 10 years
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. Twentyone 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.
0860-021X
57-61
Lambrick, D.
1deafa4b-acf3-4eff-83c9-f8274e47e993
Jakeman, J.
964f236b-525a-44c9-98eb-d0b303e908bf
Grigg, R.
b83d3315-5ad7-4f4d-8481-a1837103af01
Kaufmann, S.
624137bc-2860-4bc1-b070-436814fb8181
Faulkner, J.
5fc84805-3f93-4444-ade8-0f18dfab6390
Lambrick, D.
1deafa4b-acf3-4eff-83c9-f8274e47e993
Jakeman, J.
964f236b-525a-44c9-98eb-d0b303e908bf
Grigg, R.
b83d3315-5ad7-4f4d-8481-a1837103af01
Kaufmann, S.
624137bc-2860-4bc1-b070-436814fb8181
Faulkner, J.
5fc84805-3f93-4444-ade8-0f18dfab6390

Lambrick, D., Jakeman, J., Grigg, R., Kaufmann, S. and Faulkner, J. (2017) The efficacy of a discontinuous graded exercise test in measuring peak oxygen uptake in children aged 8 to 10 years. Biology of Sport, 34, 57-61. (doi:10.5114/biolsport.2017.63734).

Record type: Article

Abstract

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. Twentyone 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.

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Accepted/In Press date: 9 October 2016
e-pub ahead of print date: 1 December 2016
Published date: January 2017
Organisations: Physical & Rehabilitation Health

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Local EPrints ID: 407015
URI: http://eprints.soton.ac.uk/id/eprint/407015
ISSN: 0860-021X
PURE UUID: 2bd8d46a-93dc-40e1-b23f-4580382b7e12
ORCID for D. Lambrick: ORCID iD orcid.org/0000-0002-0325-6015

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Date deposited: 29 Mar 2017 01:10
Last modified: 16 Mar 2024 04:21

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Contributors

Author: D. Lambrick ORCID iD
Author: J. Jakeman
Author: R. Grigg
Author: S. Kaufmann
Author: J. Faulkner

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