Search results for "depletion."

showing 3 items of 113 documents

Mental fatigue induced by prolonged self-regulation does not exacerbate central fatigue during subsequent whole-body endurance exercise

2015

International audience; It has been shown that the mental fatigue induced by prolonged self-regulation increases perception of effort and reduces performance during subsequent endurance exercise. However, the physiological mechanisms underlying these negative effects of mental fatigue are unclear. The primary aim of this study was to test the hypothesis that mental fatigue exacerbates central fatigue induced by whole-body endurance exercise. Twelve subjects performed 30 min of either an incongruent Stroop task to induce a condition of mental fatigue or a congruent Stroop task (control condition) in a random and counterbalanced order. Both cognitive tasks (CTs) were followed by a whole-body …

neuromuscular fatigueafferent feedbackresponse-inhibitionBehavioral Neuroscienceresponse inhibitionOriginal Research Articleneuromuscular functionstroop taskknee extensorsBiological Psychiatryperceived exertionphysical performancedecision-makingsense of effortmuscle fatigue mental exertion neuromuscular fatigue perceived exertion perception of effort sense of effort Stroop task response inhibitionmental exertionPsychiatry and Mental healthlocomotor muscle fatigueNeuropsychology and Physiological PsychologyNeurology[ SDV.NEU ] Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC]brain activationmuscle fatigueperception of effortego depletionNeuroscience
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Ozone depletion in tropospheric volcanic plumes

2010

We measured ozone (O3) concentrations in the atmospheric plumes of the volcanoes St. Augustine (1976), Mt. Etna (2004, 2009) and Eyjafjallajökull (2010) and found O3 to be strongly depleted compared to the background at each volcano. At Mt. Etna O3 was depleted within tens of seconds from the crater, the age of the St. Augustine plumes was on the order of hours, whereas the O3 destruction in the plume of Eyjafjallajökull was maintained in 1–9 day old plumes. The most likely cause for this O3 destruction are catalytic bromine reactions as suggested by a model that manages to reproduce the very early destruction of O3 but also shows that O3 destruction is ongoing for several days. Given the o…

ozone depletion volcanic plumes
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Natural Halogen Emissions to the Atmosphere: Sources, Flux, and Environmental Impact

2022

Understanding the atmospheric geochemical cycle of both natural and anthropogenic halogens is important because of the detrimental effect halogens have on the environment, notably on tropospheric and stratospheric ozone. Oceans are the primary natural source for atmospheric Cl, F, Br, and I, but anthropogenic emissions are still important, especially for Cl. While emissions of human-made halocarbons (e.g., chlorofluorocarbons or CFCs) are expected to continue to decrease allowing progressive stratospheric ozone recovery, volcanic activity (e.g., clusters of mid-scale explosive eruptions or large-scale explosive eruptions) might disturb this recovery over the next decades. This review provid…

ozone depletionmethyl halidesvolcanic gasesGeochemistry and Petrologybrominevery-short lived substancesEarth and Planetary Sciences (miscellaneous)oceansElements
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