Home/Topics/hydration

• 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
• Randomized crossover trial Date verified

  Getting behind on fluid quietly cuts how much of your fuel you actually burn

  Trained cyclists who finished a 160 minute ride 2.8% of body mass down oxidized about 16% less of the glucose they drank than when fully hydrated, with no change in gut comfort or gut barrier stress markers.

  Journal of Applied Physiology · Macrae et al. · 1 August 2026 · PMID 42420769

  hydrationcarbohydrateendurance-fuelingGI-distress
• Randomized double blind crossover Published 16 Jun 2026, not 1 Aug 2026. The August date is the print issue date. Cite the June date.

  A higher fructose drink did not worsen kidney injury markers under heat and work stress

  In a double blind crossover of 12 healthy adults doing four hours of simulated occupational heat stress, a 55% fructose sports drink and a matched sucrose drink produced the same rise in a kidney stress marker. A useful null on the fructose side of multi carbohydrate fueling, from a June paper.

  American Journal of Physiology · Tourula et al. · 16 June 2026 · PMID 42302737

  carbohydratehydrationendurance-fueling