The Slow Component of O2 Uptake Kinetics During High-Intensity Exercise in Trained and Untrained Prepubertal Children

2000 ◽  
Vol 21 (1) ◽  
pp. 31-36 ◽  
Author(s):  
Obert ◽  
Cleuziou ◽  
Candau ◽  
Courtex ◽  
Leco ◽  
...  
Keyword(s):  
High Intensity ◽  
Slow Component ◽  
Uptake Kinetics ◽  
High Intensity Exercise ◽  
O2 Uptake ◽  
Prepubertal Children ◽  
O2 Uptake Kinetics

Influence of extreme pedal rates on pulmonary O2 uptake kinetics during transitions to high-intensity exercise from an elevated baseline

2009 ◽  
Vol 169 (1) ◽  
pp. 16-23 ◽  
Author(s):  
Fred J. DiMenna ◽  
Daryl P. Wilkerson ◽  
Mark Burnley ◽  
Stephen J. Bailey ◽  
Andrew M. Jones
Keyword(s):  
High Intensity ◽  
Uptake Kinetics ◽  
High Intensity Exercise ◽  
O2 Uptake ◽  
O2 Uptake Kinetics

Pulmonary O2 uptake kinetics as a determinant of high-intensity exercise tolerance in humans

2011 ◽  
Vol 110 (6) ◽  
pp. 1598-1606 ◽  
Author(s):  
Scott R. Murgatroyd ◽  
Carrie Ferguson ◽  
Susan A. Ward ◽  
Brian J. Whipp ◽  
Harry B. Rossiter
Keyword(s):  
Steady State ◽  
High Intensity ◽  
Exercise Tolerance ◽  
Slow Component ◽  
Progressive Increase ◽  
High Intensity Exercise ◽  
Exercise Intolerance ◽  
Exercise Onset ◽  
O2 Uptake Kinetics ◽  
Two Parameters

Tolerance to high-intensity constant-power (P) exercise is well described by a hyperbola with two parameters: a curvature constant (W′) and power asymptote termed “critical power” (CP). Since the ability to sustain exercise is closely related to the ability to meet the ATP demand in a steady state, we reasoned that pulmonary O2 uptake (V̇o2) kinetics would relate to the P-tolerable duration (tlim) parameters. We hypothesized that 1) the fundamental time constant (τV̇o2) would relate inversely to CP; and 2) the slow-component magnitude (ΔV̇o2sc) would relate directly to W′. Fourteen healthy men performed cycle ergometry protocols to the limit of tolerance: 1) an incremental ramp test; 2) a series of constant-P tests to determine V̇o2max, CP, and W′; and 3) repeated constant-P tests (WR6) normalized to a 6 min tlim for τV̇o2 and ΔV̇o2sc estimation. The WR6 tlim averaged 365 ± 16 s, and V̇o2max (4.18 ± 0.49 l/min) was achieved in every case. CP (range: 171–294 W) was inversely correlated with τV̇o2 (18–38 s; R2 = 0.90), and W′ (12.8–29.9 kJ) was directly correlated with ΔV̇o2sc (0.42–0.96 l/min; R2 = 0.76). These findings support the notions that 1) rapid V̇o2 adaptation at exercise onset allows a steady state to be achieved at higher work rates compared with when V̇o2 kinetics are slower; and 2) exercise exceeding this limit initiates a “fatigue cascade” linking W′ to a progressive increase in the O2 cost of power production (V̇o2sc), which, if continued, results in attainment of V̇o2max and exercise intolerance. Collectively, these data implicate V̇o2 kinetics as a key determinant of high-intensity exercise tolerance in humans.

scholarly journals ‘Priming’ exercise and O2 uptake kinetics during treadmill running

2008 ◽  
Vol 161 (2) ◽  
pp. 182-188 ◽  
Author(s):  
Andrew M. Jones ◽  
Fred DiMenna ◽  
Fiona Lothian ◽  
Esme Taylor ◽  
Stephen W. Garland ◽  
...  
Keyword(s):  
Uptake Kinetics ◽  
Treadmill Running ◽  
O2 Uptake ◽  
O2 Uptake Kinetics ◽  
Priming Exercise

Influence of endurance training on muscle [PCr] kinetics during high-intensity exercise

2007 ◽  
Vol 293 (1) ◽  
pp. R392-R401 ◽  
Author(s):  
Andrew M. Jones ◽  
Daryl P. Wilkerson ◽  
Nicolas J. Berger ◽  
Jonathan Fulford
Keyword(s):  
Endurance Training ◽  
High Intensity ◽  
Slow Component ◽  
Knee Extension ◽  
High Intensity Exercise ◽  
Whole Body ◽  
Time To Exhaustion ◽  
Exercise Tests ◽  
Before And After ◽  
Knee Extension Exercise

We hypothesized that a period of endurance training would result in a speeding of muscle phosphocreatine concentration ([PCr]) kinetics over the fundamental phase of the response and a reduction in the amplitude of the [PCr] slow component during high-intensity exercise. Six male subjects (age 26 ± 5 yr) completed 5 wk of single-legged knee-extension exercise training with the alternate leg serving as a control. Before and after the intervention period, the subjects completed incremental and high-intensity step exercise tests of 6-min duration with both legs separately inside the bore of a whole-body magnetic resonance spectrometer. The time-to-exhaustion during incremental exercise was not changed in the control leg [preintervention group (PRE): 19.4 ± 2.3 min vs. postintervention group (POST): 19.4 ± 1.9 min] but was significantly increased in the trained leg (PRE: 19.6 ± 1.6 min vs. POST: 22.0 ± 2.2 min; P < 0.05). During step exercise, there were no significant changes in the control leg, but end-exercise pH and [PCr] were higher after vs. before training. The time constant for the [PCr] kinetics over the fundamental exponential region of the response was not significantly altered in either the control leg (PRE: 40 ± 13 s vs. POST: 43 ± 10 s) or the trained leg (PRE: 38 ± 8 s vs. POST: 40 ± 12 s). However, the amplitude of the [PCr] slow component was significantly reduced in the trained leg (PRE: 15 ± 7 vs. POST: 7 ± 7% change in [PCr]; P < 0.05) with there being no change in the control leg (PRE: 13 ± 8 vs. POST: 12 ± 10% change in [PCr]). The attenuation of the [PCr] slow component might be mechanistically linked with enhanced exercise tolerance following endurance training.

scholarly journals Locomotor Muscle Fatigue Does Not Alter Oxygen Uptake Kinetics during High-Intensity Exercise

2016 ◽  
Vol 7 ◽  
Author(s):  
James G. Hopker ◽  
Giuseppe Caporaso ◽  
Andrea Azzalin ◽  
Roger Carpenter ◽  
Samuele M. Marcora
Keyword(s):  
Oxygen Uptake ◽  
Muscle Fatigue ◽  
High Intensity ◽  
Oxygen Uptake Kinetics ◽  
Uptake Kinetics ◽  
High Intensity Exercise

Effects of Acute Creatine Kinase Inhibition on Skeletal Muscle O2 Uptake Kinetics

2006 ◽  
Vol 38 (Supplement) ◽  
pp. S519-S520 ◽  
Author(s):  
Bruno Grassi ◽  
Michael C. Hogan ◽  
Harry B. Rossiter ◽  
Richard A. Howlett ◽  
James E. Harris ◽  
...  
Keyword(s):  
Skeletal Muscle ◽  
Creatine Kinase ◽  
Uptake Kinetics ◽  
O2 Uptake ◽  
Kinase Inhibition ◽  
O2 Uptake Kinetics
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