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Félix-Faure Jim Gaillard Jérémie Descloux Stéphane Chanudet Vincent Poirel Alain Baudoin Jean-Marc Avrillier Jean-Noël Millery Annie Dambrine Etienne 《Ecosystems》2019,22(2):312-330
Ecosystems - When a water reservoir is created, the pre-existing soils and vegetation are flooded. Here, we took advantage of the complete emptying of the Sarrans Reservoir, which was flooded... 相似文献
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J. F. Kahn J. C. Jouanin J. L. Bussière E. Tinet S. Avrillier J. P. Ollivier H. Monod 《European journal of applied physiology and occupational physiology》1998,78(2):183-187
To determine the external force that induces maximal deoxygenation of brachioradialis muscle 32 trained male subjects maintained
isometric contractions using the elbow flexor muscles up to the limit time (isotonic part of the isometric contraction, IIC)
and beyond that time for 120 s (anisotonic part of the isometric contraction). During IIC each subject maintained relative
forces of either 25% and 70% maximal voluntary contraction (MVC), 50% and 100% MVC, or 40% and 60% MVC. Muscle oxygenation
was assessed using a near infrared spectroscope, and expressed as a percentage of the reference value (ΔO2rest) which was the difference between the minimal oxygenation obtained after 6 min of ischaemia at rest and the maximal reoxygenation
following the release of the tourniquet. During IIC at 25% MVC, muscle oxygenation decreased to 17 (SEM 3)% ΔO2rest, then it levelled off [25 (SEM 1)% ΔO2rest]. After the point at which target force could not be maintained, reoxygenation was very weak. During IIC at 40%, 50%, 60%,
and 70% MVC, the lowest muscle oxygenation values were obtained after 15–20 s of contraction and corresponded to −18 (SEM
6), −59 (SEM 12) −31 (SEM 6), and −29 (SEM 6)% ΔO2rest, respectively. For the contraction at 100% MVC, the lowest oxygenation [−19 (SEM 9)% ΔO2rest] was obtained while force was decreasing (69% MVC). During the anisotonic part of the isometric contractions, the greatest
reoxygenation rate was obtained after 50% MVC IIC (P < 0.001). Our results showed that during isometric elbow flexions between 25% and 100% MVC, there was no linear relationship
between external force and muscle oxygenation, and that the maximal deoxygenation of the brachioradialis muscle was obtained
at 50% MVC.
Accepted: 16 February 1998 相似文献
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Ibanez Sébastien Brun Charles Millery Annie Piton Gabin Bernard Lionel Avrillier Jean-Noël Gallet Christiane Foulquier Arnaud Clément Jean-Christophe 《Plant and Soil》2021,460(1-2):511-525
Plant and Soil - In cold biomes, snow cover mitigates the harsh winter soil conditions, thereby enhancing overwinter decomposition of organic matter which controls the availability of nutrients for... 相似文献
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A new agitation system, called Turboxal, used for the oxygenation and the mixing of wastewater biological treatment tanks has been studied. The interactions between the shell and the three impellers which compose the Turboxal have been analyzed by single‐phase flow patterns. The pumping capacity and the power consumption have also been measured. In addition, the gas dispersion regimes have been analyzed in the tank and in the shell. Finally, the effect of the interaction and the effect of the position of the different agitators on the limit of the flooding regime have been determined. 相似文献
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