Oxygen uptake kinetics in trained female adolescents

Viswanath B. Unnithan, Denise M. Roche, Max Garrard, Kat Holloway, Simon Marwood

Research output: Contribution to journalMeeting Abstract

Abstract

Little evidence exists with regard to the effect that exercise training has upon oxygen uptake kinetics in female adolescents.
PURPOSE: The aim of the study was to compare VO2 and muscle deoxygenation kinetics in a group of trained (Tr) and untrained (Utr) female adolescents.
METHODS: Twelve trained (6.4 ± 0.9 years training, 10.3 ± 1.4 months per year training, 5.2 ± 2.0 hours per week) adolescent female soccer players (Age: 14.6 ± 0.7 years) were compared to a group (n=8) of recreationally active adolescent girls (Age: 15.1 ± 0.6 years) of similar maturity status. Subjects underwent two, 6-min exercise transitions at a workload equivalent to 80% of lactate threshold from a 3-min baseline of 10W. All subjects had a passive rest period of 45-min between each square-wave transition. Breath-by-breath oxygen uptake and muscle deoxygenation (deoxyhaemoglobin signal from near infrared spectroscopy) were measured throughout the square wave transitions and were modeled via a monoexponential decay with a delay relative to the start of exercise.
RESULTS: Peak VO2 was significantly (p<0.05) greater in the Tr compared to the Utr (Tr: 43.2 ± 3.2 mL·kg-1min-1 vs. Utr: 34.6 ± 4.0 mL·kg-1min-1). The time constant of the VO2 on-kinetics was significantly (p<0.05) faster in the Tr compared to the Utr (Tr: 26.3 ± 6.9 s vs. Utr: 35.1 ± 11.5 s). There was no inter-group difference in the time constant for muscle deoxygenation kinetics (Tr: 8.54 ± 3.0 s vs. Utr: 12.4 ± 8.3 s).
CONCLUSION: The evidence from the present study suggests that exercise training and/or genetic self-selection results in faster on-kinetics in trained adolescent females. The lack of difference in muscle deoxygenation kinetics suggests that cardiovascular and peripheral adaptations were similarly responsible for the faster on-kinetics noted in the trained adolescent females.
Original languageEnglish
Pages (from-to)545-545
Number of pages1
JournalMedicine & Science in Sports & Exercise
Volume42
Issue number5
DOIs
Publication statusPublished - May 2010
Externally publishedYes

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Oxygen
Exercise
Muscles
Soccer
Near-Infrared Spectroscopy
Workload
Lactic Acid

Cite this

Unnithan, Viswanath B. ; Roche, Denise M. ; Garrard, Max ; Holloway, Kat ; Marwood, Simon. / Oxygen uptake kinetics in trained female adolescents. In: Medicine & Science in Sports & Exercise. 2010 ; Vol. 42, No. 5. pp. 545-545.
@article{787a467ec3604cd59012cfe0ff6852e8,
title = "Oxygen uptake kinetics in trained female adolescents",
abstract = "Little evidence exists with regard to the effect that exercise training has upon oxygen uptake kinetics in female adolescents.PURPOSE: The aim of the study was to compare VO2 and muscle deoxygenation kinetics in a group of trained (Tr) and untrained (Utr) female adolescents.METHODS: Twelve trained (6.4 ± 0.9 years training, 10.3 ± 1.4 months per year training, 5.2 ± 2.0 hours per week) adolescent female soccer players (Age: 14.6 ± 0.7 years) were compared to a group (n=8) of recreationally active adolescent girls (Age: 15.1 ± 0.6 years) of similar maturity status. Subjects underwent two, 6-min exercise transitions at a workload equivalent to 80{\%} of lactate threshold from a 3-min baseline of 10W. All subjects had a passive rest period of 45-min between each square-wave transition. Breath-by-breath oxygen uptake and muscle deoxygenation (deoxyhaemoglobin signal from near infrared spectroscopy) were measured throughout the square wave transitions and were modeled via a monoexponential decay with a delay relative to the start of exercise.RESULTS: Peak VO2 was significantly (p<0.05) greater in the Tr compared to the Utr (Tr: 43.2 ± 3.2 mL·kg-1min-1 vs. Utr: 34.6 ± 4.0 mL·kg-1min-1). The time constant of the VO2 on-kinetics was significantly (p<0.05) faster in the Tr compared to the Utr (Tr: 26.3 ± 6.9 s vs. Utr: 35.1 ± 11.5 s). There was no inter-group difference in the time constant for muscle deoxygenation kinetics (Tr: 8.54 ± 3.0 s vs. Utr: 12.4 ± 8.3 s).CONCLUSION: The evidence from the present study suggests that exercise training and/or genetic self-selection results in faster on-kinetics in trained adolescent females. The lack of difference in muscle deoxygenation kinetics suggests that cardiovascular and peripheral adaptations were similarly responsible for the faster on-kinetics noted in the trained adolescent females.",
author = "Unnithan, {Viswanath B.} and Roche, {Denise M.} and Max Garrard and Kat Holloway and Simon Marwood",
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Oxygen uptake kinetics in trained female adolescents. / Unnithan, Viswanath B.; Roche, Denise M.; Garrard, Max; Holloway, Kat; Marwood, Simon.

In: Medicine & Science in Sports & Exercise, Vol. 42, No. 5, 05.2010, p. 545-545.

Research output: Contribution to journalMeeting Abstract

TY - JOUR

T1 - Oxygen uptake kinetics in trained female adolescents

AU - Unnithan, Viswanath B.

AU - Roche, Denise M.

AU - Garrard, Max

AU - Holloway, Kat

AU - Marwood, Simon

PY - 2010/5

Y1 - 2010/5

N2 - Little evidence exists with regard to the effect that exercise training has upon oxygen uptake kinetics in female adolescents.PURPOSE: The aim of the study was to compare VO2 and muscle deoxygenation kinetics in a group of trained (Tr) and untrained (Utr) female adolescents.METHODS: Twelve trained (6.4 ± 0.9 years training, 10.3 ± 1.4 months per year training, 5.2 ± 2.0 hours per week) adolescent female soccer players (Age: 14.6 ± 0.7 years) were compared to a group (n=8) of recreationally active adolescent girls (Age: 15.1 ± 0.6 years) of similar maturity status. Subjects underwent two, 6-min exercise transitions at a workload equivalent to 80% of lactate threshold from a 3-min baseline of 10W. All subjects had a passive rest period of 45-min between each square-wave transition. Breath-by-breath oxygen uptake and muscle deoxygenation (deoxyhaemoglobin signal from near infrared spectroscopy) were measured throughout the square wave transitions and were modeled via a monoexponential decay with a delay relative to the start of exercise.RESULTS: Peak VO2 was significantly (p<0.05) greater in the Tr compared to the Utr (Tr: 43.2 ± 3.2 mL·kg-1min-1 vs. Utr: 34.6 ± 4.0 mL·kg-1min-1). The time constant of the VO2 on-kinetics was significantly (p<0.05) faster in the Tr compared to the Utr (Tr: 26.3 ± 6.9 s vs. Utr: 35.1 ± 11.5 s). There was no inter-group difference in the time constant for muscle deoxygenation kinetics (Tr: 8.54 ± 3.0 s vs. Utr: 12.4 ± 8.3 s).CONCLUSION: The evidence from the present study suggests that exercise training and/or genetic self-selection results in faster on-kinetics in trained adolescent females. The lack of difference in muscle deoxygenation kinetics suggests that cardiovascular and peripheral adaptations were similarly responsible for the faster on-kinetics noted in the trained adolescent females.

AB - Little evidence exists with regard to the effect that exercise training has upon oxygen uptake kinetics in female adolescents.PURPOSE: The aim of the study was to compare VO2 and muscle deoxygenation kinetics in a group of trained (Tr) and untrained (Utr) female adolescents.METHODS: Twelve trained (6.4 ± 0.9 years training, 10.3 ± 1.4 months per year training, 5.2 ± 2.0 hours per week) adolescent female soccer players (Age: 14.6 ± 0.7 years) were compared to a group (n=8) of recreationally active adolescent girls (Age: 15.1 ± 0.6 years) of similar maturity status. Subjects underwent two, 6-min exercise transitions at a workload equivalent to 80% of lactate threshold from a 3-min baseline of 10W. All subjects had a passive rest period of 45-min between each square-wave transition. Breath-by-breath oxygen uptake and muscle deoxygenation (deoxyhaemoglobin signal from near infrared spectroscopy) were measured throughout the square wave transitions and were modeled via a monoexponential decay with a delay relative to the start of exercise.RESULTS: Peak VO2 was significantly (p<0.05) greater in the Tr compared to the Utr (Tr: 43.2 ± 3.2 mL·kg-1min-1 vs. Utr: 34.6 ± 4.0 mL·kg-1min-1). The time constant of the VO2 on-kinetics was significantly (p<0.05) faster in the Tr compared to the Utr (Tr: 26.3 ± 6.9 s vs. Utr: 35.1 ± 11.5 s). There was no inter-group difference in the time constant for muscle deoxygenation kinetics (Tr: 8.54 ± 3.0 s vs. Utr: 12.4 ± 8.3 s).CONCLUSION: The evidence from the present study suggests that exercise training and/or genetic self-selection results in faster on-kinetics in trained adolescent females. The lack of difference in muscle deoxygenation kinetics suggests that cardiovascular and peripheral adaptations were similarly responsible for the faster on-kinetics noted in the trained adolescent females.

U2 - 10.1249/01.MSS.0000385342.00280.af

DO - 10.1249/01.MSS.0000385342.00280.af

M3 - Meeting Abstract

VL - 42

SP - 545

EP - 545

JO - Medicine & Science in Sports & Exercise

JF - Medicine & Science in Sports & Exercise

SN - 0195-9131

IS - 5

ER -