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

C. R. Potter, J. K. Zakrzewski, S. B. Draper, V. B. Unnithan

Research output: Contribution to journalJournal Article

6 Citations (Scopus)

Abstract

OBJECTIVE To compare the phase II oxygen uptake time constant (τV'O(2)) and V'O(2) mean response time (V'O(2)MRT) 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 0 W to 90% GET were completed. Individual phase II τV'O(2) and V'O(2)MRTs 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, P0.05); 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.
Original languageEnglish
Pages (from-to)101-106
Number of pages6
JournalInternational Journal of Obesity
DOIs
Publication statusPublished - Jan 2013
Externally publishedYes

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Exercise
Oxygen
Gases
Architectural Accessibility
Exercise Test
Reaction Time

Keywords

  • children
  • overweight
  • oxygen uptake kinetics
  • peak oxygen uptake

Cite this

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title = "The oxygen uptake kinetic response to moderate intensity exercise in overweight and non-overweight children",
abstract = "OBJECTIVE To compare the phase II oxygen uptake time constant (τV'O(2)) and V'O(2) mean response time (V'O(2)MRT) 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 0 W to 90{\%} GET were completed. Individual phase II τV'O(2) and V'O(2)MRTs 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, P0.05); 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.",
keywords = "children, overweight, oxygen uptake kinetics, peak oxygen uptake",
author = "Potter, {C. R.} and Zakrzewski, {J. K.} and Draper, {S. B.} and Unnithan, {V. B.}",
year = "2013",
month = "1",
doi = "10.1038/ijo.2012.130",
language = "English",
pages = "101--106",
journal = "International Journal of Obesity",
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The oxygen uptake kinetic response to moderate intensity exercise in overweight and non-overweight children. / Potter, C. R.; Zakrzewski, J. K.; Draper, S. B.; Unnithan, V. B.

In: International Journal of Obesity, 01.2013, p. 101-106.

Research output: Contribution to journalJournal Article

TY - JOUR

T1 - The oxygen uptake kinetic response to moderate intensity exercise in overweight and non-overweight children

AU - Potter, C. R.

AU - Zakrzewski, J. K.

AU - Draper, S. B.

AU - Unnithan, V. B.

PY - 2013/1

Y1 - 2013/1

N2 - OBJECTIVE To compare the phase II oxygen uptake time constant (τV'O(2)) and V'O(2) mean response time (V'O(2)MRT) 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 0 W to 90% GET were completed. Individual phase II τV'O(2) and V'O(2)MRTs 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, P0.05); 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.

AB - OBJECTIVE To compare the phase II oxygen uptake time constant (τV'O(2)) and V'O(2) mean response time (V'O(2)MRT) 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 0 W to 90% GET were completed. Individual phase II τV'O(2) and V'O(2)MRTs 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, P0.05); 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.

KW - children

KW - overweight

KW - oxygen uptake kinetics

KW - peak oxygen uptake

U2 - 10.1038/ijo.2012.130

DO - 10.1038/ijo.2012.130

M3 - Journal Article

C2 - 22907694

SP - 101

EP - 106

JO - International Journal of Obesity

JF - International Journal of Obesity

SN - 0307-0565

ER -