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• Single arm interventional heat acclimation study Date verified

  Relationships between plasma volume, fluid regulatory hormones, and maximal oxygen uptake following fixed-workload heat acclimation in men and women

  Twenty six men and women did ten days of fixed workload exercise in a hot chamber. They adapted in all the usual ways, running cooler with lower heart rates and more sweat. But blood plasma volume held steady and maximal oxygen uptake did not move, which are the two changes heat training is often expected to deliver.

  American Journal of Physiology, · Greenfield et al. · US Army Research Institute of Environmental Medicine · 7 August 2026 · PMID 42566767

  heathydrationendurance-fuelingrecovery
• Randomised double blind counterbalanced crossover trial Date verified

  Ketone monoester ingestion and cognitive and physical performance during exercise-heat stress

  Endurance trained men who took a ketone monoester alongside caffeine before 90 minutes of loaded walking in the heat lasted 8.9 minutes in a following run to exhaustion, against 7.0 minutes on an energy matched carbohydrate drink, and held their accuracy on the easier of two working memory tasks. Core temperature and heart rate were the same either way.

  Journal of the International · Lints et al. · University of South Carolina · 16 July 2026 · PMID 42460838

  ketonesheatcaffeineendurance-fueling