Phase I and Phase II Oxygen Uptake Kinetics During Atrioventricular Dyssynchrony in Chronotropically Competent Pacemaker Patients

CHEST Journal ◽  
2005 ◽  
Vol 128 (3) ◽  
pp. 1782-1789 ◽  
Author(s):  
Corey R. Tomczak ◽  
Wladyslaw Wojcik ◽  
Edward F.G. Busse ◽  
Robert G. Haennel
Keyword(s):  
Oxygen Uptake ◽  
Phase I ◽  
Phase Ii ◽  
Oxygen Uptake Kinetics ◽  
Uptake Kinetics

scholarly journals Relationship between (non)linear phase II pulmonary oxygen uptake kinetics with skeletal muscle oxygenation and age in 11–15 year olds

2019 ◽  
Vol 104 (12) ◽  
pp. 1929-1941 ◽  
Author(s):  
Brynmor C. Breese ◽  
Zoe L. Saynor ◽  
Alan R. Barker ◽  
Neil Armstrong ◽  
Craig A. Williams
Keyword(s):  
Skeletal Muscle ◽  
Oxygen Uptake ◽  
Phase Ii ◽  
Oxygen Uptake Kinetics ◽  
Uptake Kinetics ◽  
Muscle Oxygenation ◽  
Linear Phase ◽  
Pulmonary Oxygen Uptake ◽  
Non Linear ◽  
Skeletal Muscle Oxygenation

scholarly journals The effect of priming exercise on O2 uptake kinetics, muscle O2 delivery and utilization, muscle activity, and exercise tolerance in boys

2014 ◽  
Vol 39 (3) ◽  
pp. 308-317 ◽  
Author(s):  
Alan R. Barker ◽  
Emily Trebilcock ◽  
Brynmor Breese ◽  
Andrew M. Jones ◽  
Neil Armstrong
Keyword(s):  
Oxygen Uptake ◽  
Phase Ii ◽  
Muscle Activity ◽  
Oxygen Delivery ◽  
Exercise Tolerance ◽  
Slow Component ◽  
Oxygen Uptake Kinetics ◽  
Uptake Kinetics ◽  
Muscle Oxygen ◽  
Priming Exercise

This study used priming exercise in young boys to investigate (i) how muscle oxygen delivery and oxygen utilization, and muscle activity modulate oxygen uptake kinetics during exercise; and (ii) whether the accelerated oxygen uptake kinetics following priming exercise can improve exercise tolerance. Seven boys that were aged 11.3 ± 1.6 years completed either a single bout (bout 1) or repeated bouts with 6 min of recovery (bout 2) of very heavy-intensity cycling exercise. During the tests oxygen uptake, muscle oxygenation, muscle electrical activity and exercise tolerance were measured. Priming exercise most likely shortened the oxygen uptake mean response time (change, ±90% confidence limits; –8.0 s, ±3.0), possibly increased the phase II oxygen uptake amplitude (0.11 L·min−1, ±0.09) and very likely reduced the oxygen uptake slow component amplitude (–0.08 L·min−1, ±0.07). Priming resulted in a likely reduction in integrated electromyography (–24% baseline, ±21% and –25% baseline, ±19) and a very likely reduction in Δ deoxyhaemoglobin/Δoxygen uptake (–0.16, ±0.11 and –0.09, ±0.05) over the phase II and slow component portions of the oxygen uptake response, respectively. A correlation was present between the change in tissue oxygenation index during bout 2 and the change in the phase II (r = –0.72, likely negative) and slow component (r = 0.72, likely positive) oxygen uptake amplitudes following priming exercise, but not for muscle activity. Exercise tolerance was likely reduced (change –177 s, ±180) following priming exercise. The altered phase II and slow component oxygen uptake amplitudes in boys following priming exercise are linked to an improved localised matching of muscle oxygen delivery to oxygen uptake and not muscle electrical activity. Despite more rapid oxygen uptake kinetics following priming exercise, exercise tolerance was not enhanced.

scholarly journals Pulmonary O2 uptake on-kinetics in sprint- and endurance-trained athletes

2007 ◽  
Vol 32 (3) ◽  
pp. 383-393 ◽  
Author(s):  
Nicolas J.A. Berger ◽  
Andrew M. Jones
Keyword(s):  
Oxygen Uptake ◽  
Phase Ii ◽  
Exercise Performance ◽  
Slow Component ◽  
Oxygen Uptake Kinetics ◽  
Uptake Kinetics ◽  
Anaerobic Exercise ◽  
Moderate Intensity ◽  
Peak Power Output ◽  
Severe Intensity

Pulmonary O2 uptake kinetics during “step” exercise have not been characterized in young, sprint-trained (SPT), athletes. Therefore, the objective of this study was to test the hypotheses that SPT athletes would have (i) slower phase II kinetics and (ii) a greater oxygen uptake “slow component” when compared with endurance-trained (ENT) athletes. Eight sub-elite SPT athletes (mean ( ± SD) age = 25 (±7) y; mass = 80.3 (±7.3) kg) and 8 sub-elite ENT athletes (age= 28 (±4) y; mass = 73.2 (±5.1) kg) completed a ramp incremental cycle ergometer test, a Wingate 30 s anaerobic sprint test, and repeat “step” transitions in work rate from 20 W to moderate- and severe-intensity cycle exercise, during which pulmonary oxygen uptake was measured breath by breath. The phase II oxygen uptake kinetics were significantly slower in the SPT athletes both for moderate (time constant, τ; SPT 32 (±4) s vs. ENT 17 (±3) s; p < 0.01) and severe (SPT 32 (±12) s vs. ENT 20 (±6) s; p < 0.05) exercise. The amplitude of the slow component (derived by exponential modelling) was not significantly different between the groups (SPT 0.55 (±0.12) L·min–1 vs. ENT 0.50 (±0.22) L·min–1), but the increase in oxygen uptake between 3 and 6 min of severe exercise was greater in the SPT athletes (SPT 0.37 (±0.08) L·min–1 vs. ENT 0.20 (±0.09) L·min–1; p < 0.01). The phase II τ was significantly correlated with indices of aerobic exercise performance (e.g., peak oxygen uptake (moderate-intensity r = –0.88, p < 0.01; severe intensity r = –0.62; p < 0.05), whereas the relative amplitude of the oxygen uptake slow component was significantly correlated with indices of anaerobic exercise performance (e.g., Wingate peak power output; r = 0.77; p < 0.01). Thus, it could be concluded that sub-elite SPT athletes have slower phase II oxygen uptake kinetics and a larger oxygen uptake slow component compared with sub-elite ENT athletes. It appears that indices of aerobic and anaerobic exercise performance differentially influence the fundamental and slow components of the oxygen uptake kinetics.

Sodium bicarbonate ingestion does not alter the slow component of oxygen uptake kinetics in professional cyclists

2003 ◽  
Vol 21 (1) ◽  
pp. 39-47 ◽  
Author(s):  
ALFREDO SANTALLA ◽  
MARGARITA PÉREZ ◽  
MANUEL MONTILLA ◽  
LÁZARO VICENTE ◽  
RICHARD DAVISON ◽  
...  
Keyword(s):  
Oxygen Uptake ◽  
Sodium Bicarbonate ◽  
Slow Component ◽  
Oxygen Uptake Kinetics ◽  
Uptake Kinetics

Energy expenditure and oxygen uptake kinetics in critically ill elderly patients

2021 ◽  
Author(s):  
Takeshi Ebihara ◽  
Kentaro Shimizu ◽  
Masahiro Ojima ◽  
Yohei Nakamura ◽  
Yumi Mitsuyama ◽  
...  
Keyword(s):  
Energy Expenditure ◽  
Oxygen Uptake ◽  
Elderly Patients ◽  
Critically Ill ◽  
Oxygen Uptake Kinetics ◽  
Uptake Kinetics

Oxygen uptake kinetics during treadmill walking in adolescents with clinically stable cystic fibrosis

2021 ◽  
pp. 1-9
Author(s):  
Yann Combret ◽  
Clément Medrinal ◽  
Guillaume Prieur ◽  
Aurora Robledo Quesada ◽  
Timothée Gillot ◽  
...  
Keyword(s):  
Cystic Fibrosis ◽  
Oxygen Uptake ◽  
Oxygen Uptake Kinetics ◽  
Treadmill Walking ◽  
Uptake Kinetics
Sign in / Sign up

Export Citation Format

Share Document