Hypoxémie et Temps Limite à la Vitesse Aérobie Maximale Chez des Coureurs de Fond

1995 ◽  
Vol 20 (1) ◽  
pp. 102-111 ◽  
Author(s):  
Veronique Billat ◽  
Jean-Cyril Renoux ◽  
Jacques Pinoteau ◽  
Bernard Petit ◽  
Jean-Pierre Koralsztein
Keyword(s):  
Partial Pressure ◽  
Great Variability ◽  
Time To Exhaustion ◽  
Partial Pressure Of Oxygen ◽  
Distance Runners ◽  
Long Distance ◽  
Oxyhemoglobin Saturation ◽  
Arterial Partial Pressure ◽  
Maximal Aerobic Speed ◽  
Exercise Induced

A recent paper (Billat et al., 1994a) has shown the reproducibility but also the great variability between subelite long-distance runners in their time to exhaustion at the velocity which elicits [Formula: see text], called the maximal aerobic speed (MAS). The present study delved further into the reasons for this large difference between runners having the same [Formula: see text]. The question addressed was whether the exercise-induced hypoxemia (EIH) was more important for athletes having the longest time to exhaustion at 90 (Tlim 90), 100 (Tlim 100), or 105% (Tlim 105) of MAS. The study was conducted on 16 elite male runners. EIH was observed, that is, arteriel oxyhemoglobin saturation and arterial partial pressure of oxygen dropped significantly after all the Tlim tests. However, EIH was only correlated with Tlim 90 (r = −0.757; −0.531, respectively). Key words: exercise, running

Training Profile Counts for Time-to-Exhaustion Performance

2003 ◽  
Vol 28 (4) ◽  
pp. 654-666 ◽  
Author(s):  
Fabien A. Basset ◽  
Richard Chouinard ◽  
Marcel R. Boulay
Keyword(s):  
Heart Rate ◽  
Time To Exhaustion ◽  
Maximal Velocity ◽  
Maximal Heart Rate ◽  
Treadmill Test ◽  
Distance Runners ◽  
Long Distance ◽  
Significant Difference ◽  
Maximal Aerobic Speed ◽  
Track Test

The objective of this study was to compare the time to exhaustion (Tlim) at maximal aerobic speed ([Formula: see text]) in middle- and long-distance runners. Five middle-distance (MDR) and 5 long-distance (LDR) male runners, ages 28 ± 7 years, were tested running on a treadmill, with the Université de Montréal Track Test (UMTT), on maximal velocity and on time-to-exhaustion track tests. During the laboratory test, cardiorespiratory variables (e.g., HR, [Formula: see text]) were assessed. Second, running velocity at [Formula: see text] ([Formula: see text]) during the UMTT was determined and HR values were recorded; also, maximal velocity on a 30-m sprint (V30) and maximal heart rate (HR max) and time to exhaustion were determined on the track. No significant difference was observed between groups during the multistage treadmill test. Significant differences were found between groups for V30 and Tlim, with MDR showing a 23% longer running time than LDR. The results of the present study demonstrated that the training profile of middle-distance and long-distance runners plays a significant role in Tlim performance when [Formula: see text] is obtained during a test with short-duration stages. Key words: maximal oxygen uptake, runners, time limit (Tlim)

Exercise-Induced Urinary Abnormalities in Long-Distance Runners

1984 ◽  
Vol 05 (05) ◽  
pp. 237-240 ◽  
Author(s):  
P. Gilli ◽  
E. De Paoli Vitali ◽  
G. Tataranni ◽  
A. Farinelli
Keyword(s):  
Distance Runners ◽  
Long Distance ◽  
Exercise Induced ◽  
Urinary Abnormalities

scholarly journals Right-to-left shunt determination in dog lungs under inhalation anesthesia with rebreathing and non-rebreathing system

2006 ◽  
Vol 21 (6) ◽  
pp. 374-379 ◽  
Author(s):  
André Leguthe Rosa ◽  
Patrícia Cristina Azevedo Mota ◽  
Yara Marcondes Machado Castiglia
Keyword(s):  
Partial Pressure ◽  
Carbon Dioxide Partial Pressure ◽  
Partial Pressure Of Oxygen ◽  
Intrapulmonary Shunt ◽  
Inhalation Anesthesia ◽  
Arterial Partial Pressure ◽  
Venous Oxygen Saturation ◽  
Fraction Of Inspired Oxygen ◽  
Inspired Oxygen ◽  
Mixed Venous

PURPOSE: To investigatge right-to-left shunt determination in dog lungs under inhalantion anesthesia with non-rebreathing and rebreathing systems and fraction of inspired oxygen (F I O2) of 0.9 and 0.4, respectively. METHODS: Two groups of 10 dogs each under inhalation anesthesia with sevoflurane: GI in which it was utilized non-rebreathing semiclosed system and F I O2 = 0.9, and GII in which it was utilized rebreathing semiclosed system and F I O2 = 0.4. The study parameters were: heart rate, medium arterial pressure, right-to-left intrapulmonary shunt, hematocrit, hemoglobin, arterial partial pressure of oxygen, mixed venous partial pressure of oxygen, mixed venous oxygen saturation, arterial partial pressure of carbon dioxide, partial pressure of water in the alveoli. RESULTS: Shunt results were significantly different between the two groups - GI data were higher than GII in all the evaluated moments. Hence, the group with nonrebreathing (GI) developed a superior grade of intrapulmonary shunt when compared with the rebreathing group (GII). The partial pressure of water in the alveoli was significantly higher in GII. CONCLUSION: The inhalation anesthesia with non-rebreathing system and F I O2 = 0.9 developed a higher grade of intrapulmonary right-to-left shunt when compared with the rebreathing system and F I O2 = 0.4. The higher humidity in GII contributed to the result.

Variability of magnitude of the Bohr effect in human fetal blood

1963 ◽  
Vol 18 (4) ◽  
pp. 729-733 ◽  
Author(s):  
Thomas H. Kirschbaum
Keyword(s):  
Partial Pressure ◽  
Bohr Effect ◽  
Fetal Blood ◽  
Partial Pressure Of Oxygen ◽  
Oxyhemoglobin Saturation ◽  
Molecular Alterations ◽  
Acid Radical ◽  
Variable Function

A series of in vitro determinations, conducted on human fetal blood obtained at the time of delivery, of percentage oxyhemoglobin saturation, partial pressure of oxygen, and pH have made possible the evaluation of the magnitude of the Bohr effect in that substance. Analysis shows that the Bohr effect, defined as Δ log pO2/ΔpH, is a variable function of percentage oxyhemoglobin saturation over the statistically significant range in this study, from 10 to 87% saturation. The implications of this variability in terms of the molecular alterations of hemoglobin in the course of progressive oxygenation and in particular regard to the manifest heterogenicity of heme with respect to oxygen-acid radical interactions are discussed. Submitted on August 13, 1962

Changes inα-tocopherol and retinol levels during cardiopulmonary bypass correlate with maximal arterial partial pressure of oxygen

2007 ◽  
Vol 41 (9) ◽  
pp. 1061-1067 ◽  
Author(s):  
Irene Valle-Giner ◽  
Ezequiel Martí-Bonmatí ◽  
Amparo Alegría-Torán ◽  
Anastasio Montero ◽  
Esteban J. Morcillo
Keyword(s):  
Cardiopulmonary Bypass ◽  
Partial Pressure ◽  
Partial Pressure Of Oxygen ◽  
Arterial Partial Pressure
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