scholarly journals Prolonged constant load cycling exercise is associated with reduced gross efficiency and increased muscle oxygen uptake

2016 ◽  
Vol 27 (4) ◽  
pp. 408-417 ◽  
Author(s):  
J. G. Hopker ◽  
C. O'Grady ◽  
B. Pageaux
Keyword(s):  
Oxygen Uptake ◽  
Constant Load ◽  
Cycling Exercise ◽  
Muscle Oxygen ◽  
Gross Efficiency ◽  
Load Cycling ◽  
Muscle Oxygen Uptake

A model for studying the distortion of muscle oxygen uptake patterns by circulation parameters

1991 ◽  
Vol 62 (2) ◽  
pp. 83-90 ◽  
Author(s):  
D. Eβfeld ◽  
U. Hoffmann ◽  
J. Stegemann
Keyword(s):  
Oxygen Uptake ◽  
Muscle Oxygen ◽  
Circulation Parameters ◽  
Muscle Oxygen Uptake

Model of oxygen transport and metabolism predicts effect of hyperoxia on canine muscle oxygen uptake dynamics

2007 ◽  
Vol 103 (4) ◽  
pp. 1366-1378 ◽  
Author(s):  
Nicola Lai ◽  
Gerald M. Saidel ◽  
Bruno Grassi ◽  
L. Bruce Gladden ◽  
Marco E. Cabrera
Keyword(s):  
Experimental Data ◽  
Oxygen Uptake ◽  
Oxygen Content ◽  
Oxygen Transport ◽  
Mechanistic Model ◽  
Arterial Oxygen ◽  
Cellular Respiration ◽  
Arterial Oxygen Content ◽  
Muscle Oxygen ◽  
Muscle Oxygen Uptake

Previous studies have shown that increased oxygen delivery, via increased convection or arterial oxygen content, does not speed the dynamics of oxygen uptake, V̇o2m, in dog muscle electrically stimulated at a submaximal metabolic rate. However, the dynamics of transport and metabolic processes that occur within working muscle in situ is typically unavailable in this experimental setting. To investigate factors affecting V̇o2m dynamics at contraction onset, we combined dynamic experimental data across working muscle with a mechanistic model of oxygen transport and metabolism in muscle. The model is based on dynamic mass balances for O2, ATP, and PCr. Model equations account for changes in cellular ATPase, oxidative phosphorylation, and creatine kinase fluxes in skeletal muscle during exercise, and cellular respiration depends on [ADP] and [O2]. Model simulations were conducted at different levels of arterial oxygen content and blood flow to quantify the effects of convection and diffusion of oxygen on the regulation of cellular respiration during step transitions from rest to isometric contraction in dog gastrocnemius muscle. Simulations of arteriovenous O2 differences and V̇o2m dynamics were successfully compared with experimental data (Grassi B, Gladden LB, Samaja M, Stary CM, Hogan MC. J Appl Physiol 85: 1394–1403, 1998; and Grassi B, Gladden LB, Stary CM, Wagner PD, Hogan MC. J Appl Physiol 85: 1404–1412, 1998), thus demonstrating the validity of the model, as well as its predictive capability. The main findings of this study are: 1) the estimated dynamic response of oxygen utilization at contraction onset in muscle is faster than that of oxygen uptake; and 2) hyperoxia does not accelerate the dynamics of diffusion and consequently muscle oxygen uptake at contraction onset due to the hyperoxia-induced increase in oxygen stores. These in silico derived results cannot be obtained from experimental observations alone.

Non-invasive estimation of muscle oxygen uptake kinetics with pseudorandom binary sequence and step exercise responses

2017 ◽  
Vol 118 (2) ◽  
pp. 429-438 ◽  
Author(s):  
Uwe Drescher ◽  
R. Schmale ◽  
J. Koschate ◽  
L. Thieschäfer ◽  
T. Schiffer ◽  
...  
Keyword(s):  
Oxygen Uptake ◽  
Binary Sequence ◽  
Oxygen Uptake Kinetics ◽  
Uptake Kinetics ◽  
Pseudorandom Binary Sequence ◽  
Muscle Oxygen ◽  
Non Invasive ◽  
Muscle Oxygen Uptake

scholarly journals Muscle oxygen uptake and energy turnover during dynamic exercise at different contraction frequencies in humans

2001 ◽  
Vol 536 (1) ◽  
pp. 261-271 ◽  
Author(s):  
Richard A. Ferguson ◽  
Derek Ball ◽  
Peter Krustrup ◽  
Per Aagaard ◽  
Michael Kjær ◽  
...  
Keyword(s):  
Oxygen Uptake ◽  
Dynamic Exercise ◽  
Energy Turnover ◽  
Muscle Oxygen ◽  
Muscle Oxygen Uptake

scholarly journals Skeletal Muscle Oxygen Uptake Dynamics during the Exercise Off‐Transient

2009 ◽  
Vol 23 (S1) ◽  
Author(s):  
Brad J Behnke ◽  
Leonardo F Ferreira ◽  
Timothy I Musch ◽  
David C Poole
Keyword(s):  
Skeletal Muscle ◽  
Oxygen Uptake ◽  
Muscle Oxygen ◽  
Muscle Oxygen Uptake

MUSCLE OXYGEN UPTAKE IN CHRONIC HEART FAILURE 1006

1997 ◽  
Vol 29 (Supplement) ◽  
pp. 176
Author(s):  
Akiko Hanada ◽  
Kouichi Okita ◽  
Kazuya Yonezawa ◽  
Mitsunori Ohtsubo ◽  
Akira Kitabatake ◽  
...  
Keyword(s):  
Heart Failure ◽  
Chronic Heart Failure ◽  
Oxygen Uptake ◽  
Muscle Oxygen ◽  
Muscle Oxygen Uptake

Muscle oxygen uptake in humans at onset of and during intense exercise

2000 ◽  
Vol 168 (4) ◽  
pp. 457-464 ◽  
Author(s):  
J. Bangsbo
Keyword(s):  
Oxygen Uptake ◽  
Intense Exercise ◽  
Muscle Oxygen ◽  
Muscle Oxygen Uptake

Skeletal muscle oxygen uptake in obese patients: functional evaluation by knee-extension exercise

2013 ◽  
Vol 113 (8) ◽  
pp. 2125-2132 ◽  
Author(s):  
Stefano Lazzer ◽  
Desy Salvadego ◽  
Simone Porcelli ◽  
Enrico Rejc ◽  
Fiorenza Agosti ◽  
...  
Keyword(s):  
Skeletal Muscle ◽  
Oxygen Uptake ◽  
Knee Extension ◽  
Functional Evaluation ◽  
Obese Patients ◽  
Muscle Oxygen ◽  
Knee Extension Exercise ◽  
Muscle Oxygen Uptake
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