Pulmonary oxygen uptake kinetics in trained and untrained male adolescents

Simon Marwood, Denise Roche, Thomas Rowland, Max Garrard, Viswanath Unnithan

Research output: Contribution to journalMeeting Abstract

Abstract

Exercise training results in a speeding of pulmonary oxygen uptake (VO2) kinetics at the onset of exercise in adults, however only limited research has been conducted with physiologically immature subjects.

PURPOSE: The aim of the present study was to examine VO2 and muscle deoxygenation kinetics in trained and untrained male adolescents. METHOD: 16 trained (14.5 ± 0.2 yrs, VO2peak: 54.7 ± 1.6 ml.kg-1.min-1, Self-assessed Tanner stage range 2 - 4) and 9 untrained (15.4 ± 0.2 yrs, VO2peak: 43.1 ± 1.7 ml.kg-1.min-1, Tanner stage range 2 - 4) male adolescents performed two 6-min exercise transitions from a 3-min baseline of 10W to a workload equivalent to 80% lactate threshold separated by a minimum of 1 hour passive rest. Oxygen uptake (breath-by-breath) and muscle deoxygenation (deoxyhaemoglobin signal from near infrared spectroscopy) were measured continuously throughout baseline and exercise transition.

RESULTS: The time constant of the fundamental phase of VO2 kinetics was significantly faster in trained versus untrained subjects (Trained: 22.3 ± 1.8 s vs Untrained: 29.8 ± 2.8 s, p=0.03). In contrast, neither the time constant (Trained: 9.7 ± 0.7 s vs Untrained: 10.1± 1.1 s, p=0.78) or mean response time (Trained: 17.4 ± 0.6 s vs Untrained: 18.3 ± 0.8 s, p=0.39) of muscle deoxygenation kinetics was altered according to training status.

CONCLUSION: The present data suggest that exercise training results in faster VO2 kinetics in male adolescents, though inherent capabilities cannot be ruled out. Since muscle deoxygenation kinetics were unchanged, it is likely that faster VO2 kinetics were due to adaptations to both the cardiovascular system and the peripheral musculature.
Original languageEnglish
Pages (from-to)118-118
Number of pages1
JournalMedicine & Science in Sports & Exercise
Volume41
Issue number5
DOIs
Publication statusPublished - May 2009

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Oxygen
Lung
Exercise
Muscles
Near-Infrared Spectroscopy
Cardiovascular System
Workload
Reaction Time
Lactic Acid
Research

Cite this

Marwood, Simon ; Roche, Denise ; Rowland, Thomas ; Garrard, Max ; Unnithan, Viswanath. / Pulmonary oxygen uptake kinetics in trained and untrained male adolescents. In: Medicine & Science in Sports & Exercise. 2009 ; Vol. 41, No. 5. pp. 118-118.
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title = "Pulmonary oxygen uptake kinetics in trained and untrained male adolescents",
abstract = "Exercise training results in a speeding of pulmonary oxygen uptake (VO2) kinetics at the onset of exercise in adults, however only limited research has been conducted with physiologically immature subjects.PURPOSE: The aim of the present study was to examine VO2 and muscle deoxygenation kinetics in trained and untrained male adolescents. METHOD: 16 trained (14.5 ± 0.2 yrs, VO2peak: 54.7 ± 1.6 ml.kg-1.min-1, Self-assessed Tanner stage range 2 - 4) and 9 untrained (15.4 ± 0.2 yrs, VO2peak: 43.1 ± 1.7 ml.kg-1.min-1, Tanner stage range 2 - 4) male adolescents performed two 6-min exercise transitions from a 3-min baseline of 10W to a workload equivalent to 80{\%} lactate threshold separated by a minimum of 1 hour passive rest. Oxygen uptake (breath-by-breath) and muscle deoxygenation (deoxyhaemoglobin signal from near infrared spectroscopy) were measured continuously throughout baseline and exercise transition.RESULTS: The time constant of the fundamental phase of VO2 kinetics was significantly faster in trained versus untrained subjects (Trained: 22.3 ± 1.8 s vs Untrained: 29.8 ± 2.8 s, p=0.03). In contrast, neither the time constant (Trained: 9.7 ± 0.7 s vs Untrained: 10.1± 1.1 s, p=0.78) or mean response time (Trained: 17.4 ± 0.6 s vs Untrained: 18.3 ± 0.8 s, p=0.39) of muscle deoxygenation kinetics was altered according to training status.CONCLUSION: The present data suggest that exercise training results in faster VO2 kinetics in male adolescents, though inherent capabilities cannot be ruled out. Since muscle deoxygenation kinetics were unchanged, it is likely that faster VO2 kinetics were due to adaptations to both the cardiovascular system and the peripheral musculature.",
author = "Simon Marwood and Denise Roche and Thomas Rowland and Max Garrard and Viswanath Unnithan",
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Pulmonary oxygen uptake kinetics in trained and untrained male adolescents. / Marwood, Simon; Roche, Denise; Rowland, Thomas; Garrard, Max; Unnithan, Viswanath.

In: Medicine & Science in Sports & Exercise, Vol. 41, No. 5, 05.2009, p. 118-118.

Research output: Contribution to journalMeeting Abstract

TY - JOUR

T1 - Pulmonary oxygen uptake kinetics in trained and untrained male adolescents

AU - Marwood, Simon

AU - Roche, Denise

AU - Rowland, Thomas

AU - Garrard, Max

AU - Unnithan, Viswanath

PY - 2009/5

Y1 - 2009/5

N2 - Exercise training results in a speeding of pulmonary oxygen uptake (VO2) kinetics at the onset of exercise in adults, however only limited research has been conducted with physiologically immature subjects.PURPOSE: The aim of the present study was to examine VO2 and muscle deoxygenation kinetics in trained and untrained male adolescents. METHOD: 16 trained (14.5 ± 0.2 yrs, VO2peak: 54.7 ± 1.6 ml.kg-1.min-1, Self-assessed Tanner stage range 2 - 4) and 9 untrained (15.4 ± 0.2 yrs, VO2peak: 43.1 ± 1.7 ml.kg-1.min-1, Tanner stage range 2 - 4) male adolescents performed two 6-min exercise transitions from a 3-min baseline of 10W to a workload equivalent to 80% lactate threshold separated by a minimum of 1 hour passive rest. Oxygen uptake (breath-by-breath) and muscle deoxygenation (deoxyhaemoglobin signal from near infrared spectroscopy) were measured continuously throughout baseline and exercise transition.RESULTS: The time constant of the fundamental phase of VO2 kinetics was significantly faster in trained versus untrained subjects (Trained: 22.3 ± 1.8 s vs Untrained: 29.8 ± 2.8 s, p=0.03). In contrast, neither the time constant (Trained: 9.7 ± 0.7 s vs Untrained: 10.1± 1.1 s, p=0.78) or mean response time (Trained: 17.4 ± 0.6 s vs Untrained: 18.3 ± 0.8 s, p=0.39) of muscle deoxygenation kinetics was altered according to training status.CONCLUSION: The present data suggest that exercise training results in faster VO2 kinetics in male adolescents, though inherent capabilities cannot be ruled out. Since muscle deoxygenation kinetics were unchanged, it is likely that faster VO2 kinetics were due to adaptations to both the cardiovascular system and the peripheral musculature.

AB - Exercise training results in a speeding of pulmonary oxygen uptake (VO2) kinetics at the onset of exercise in adults, however only limited research has been conducted with physiologically immature subjects.PURPOSE: The aim of the present study was to examine VO2 and muscle deoxygenation kinetics in trained and untrained male adolescents. METHOD: 16 trained (14.5 ± 0.2 yrs, VO2peak: 54.7 ± 1.6 ml.kg-1.min-1, Self-assessed Tanner stage range 2 - 4) and 9 untrained (15.4 ± 0.2 yrs, VO2peak: 43.1 ± 1.7 ml.kg-1.min-1, Tanner stage range 2 - 4) male adolescents performed two 6-min exercise transitions from a 3-min baseline of 10W to a workload equivalent to 80% lactate threshold separated by a minimum of 1 hour passive rest. Oxygen uptake (breath-by-breath) and muscle deoxygenation (deoxyhaemoglobin signal from near infrared spectroscopy) were measured continuously throughout baseline and exercise transition.RESULTS: The time constant of the fundamental phase of VO2 kinetics was significantly faster in trained versus untrained subjects (Trained: 22.3 ± 1.8 s vs Untrained: 29.8 ± 2.8 s, p=0.03). In contrast, neither the time constant (Trained: 9.7 ± 0.7 s vs Untrained: 10.1± 1.1 s, p=0.78) or mean response time (Trained: 17.4 ± 0.6 s vs Untrained: 18.3 ± 0.8 s, p=0.39) of muscle deoxygenation kinetics was altered according to training status.CONCLUSION: The present data suggest that exercise training results in faster VO2 kinetics in male adolescents, though inherent capabilities cannot be ruled out. Since muscle deoxygenation kinetics were unchanged, it is likely that faster VO2 kinetics were due to adaptations to both the cardiovascular system and the peripheral musculature.

U2 - 10.1249/01.MSS.0000354917.69665.b1

DO - 10.1249/01.MSS.0000354917.69665.b1

M3 - Meeting Abstract

VL - 41

SP - 118

EP - 118

JO - Medicine & Science in Sports & Exercise

JF - Medicine & Science in Sports & Exercise

SN - 0195-9131

IS - 5

ER -