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.
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
January 2017
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, .
(doi:10.5114/biolsport.2017.63734).
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.
Text
The efficacy of a discontinuous graded exercise test in measuring peak oxygen uptake in children aged 8 to 10 years
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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
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Date deposited: 29 Mar 2017 01:10
Last modified: 16 Mar 2024 04:21
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Author:
J. Jakeman
Author:
R. Grigg
Author:
S. Kaufmann
Author:
J. Faulkner
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