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http://dx.doi.org/10.1016/j.mjafi.2020.09.008 | DOI Listing |
Physiol Rep
September 2025
Military Nutrition Division, U.S. Army Research Institute of Environmental Medicine, Natick, Massachusetts, USA.
This study investigated the effects of fermentable fiber and polyphenol supplementation on mood and cognition following rapid ascent to simulated 4300 m. Healthy adults (n = 13, 21 ± 3 years) participated in a randomized, placebo-controlled crossover study consisting of three, 2-week phases separated by ≥1 week. Food products containing the fiber and polyphenol supplement or placebo were consumed during each phase.
View Article and Find Full Text PDFAm J Physiol Regul Integr Comp Physiol
September 2025
United States Army Research Institute of Environmental Medicine, Natick, MA, US.
Unlabelled: Insulin resistance has been associated with acute mountain sickness (AMS) risk, but the influence of active ascent is unclear.
Methods: Thirty-two unacclimatized Soldiers (23±4yr; 80±14 kg) were tested at baseline residence (BLR), hiked ~5 km (n=16) or were driven (n=16) to 4,300 m, and stayed for 4 days (~66 h). Venous blood was taken each morning at BLR and during high altitude (HA) exposure days 2-4 (HA2-4) and the evening on day 1 at HA (HA1).
PLoS One
September 2025
Misión Biológica de Galicia (MBG-CSIC), Pontevedra, Galicia, Spain.
Specialized plant metabolism, particularly phenolic compound production, contributes significantly to the functioning and resilience of mountain ecosystems. Livestock grazing can influence phenolic production, with its effects varying depending on microclimatic factors and soil conditions. Despite the ecological significance of this process, the impact of livestock grazing on phenolic production in alpine plants remains insufficiently explored.
View Article and Find Full Text PDFExp Physiol
September 2025
Department of Sports Science and Clinical Biomechanics, Faculty of Health Sciences, University of Southern Denmark, Odense, Denmark.
High-altitude training is widely adopted by endurance athletes with the aim of increasing total haemoglobin mass (tHb) and thereby endurance exercise performance. However, divergent effects on tHb and exercise performance have been reported in athletes commencing altitude camps with initial high baseline levels for tHb, questioning the efficacy of in-season interventions in elite athletes. Therefore, haematological adaptations and exercise performance were evaluated in 12 elite cyclists completing an in-season 'Live High-Train High' (LHTH) altitude camp (21 days at 3000 m) immediately after participating in the national championships.
View Article and Find Full Text PDFPLoS One
September 2025
Comet Research Group, Prescott, Arizona, United States of America.
Shocked quartz grains are an accepted indicator of crater-forming cosmic impact events, which also typically produce amorphous silica along the fractures. Furthermore, previous research has shown that shocked quartz can form when nuclear detonations, asteroids, and comets produce near-surface or "touch-down" airbursts. When cosmic airbursts detonate with enough energy and at sufficiently low altitude, the resultant relatively small, high-velocity fragments may strike Earth's surface with high enough pressures to generate thermal and mechanical shock that can fracture quartz grains and introduce molten silica into the fractures.
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