Effect of Fluid Intake on Acute Changes in Plasma Volume: A Randomized Controlled Crossover Pilot Trial.

Plasma volume (PV) undergoes constant and dynamic changes, leading to a large intra-day variability in healthy individuals. Hydration is known to induce PV changes; however, the response to the intake of osmotically different fluids is still not fully understood. In a randomized controlled crossover trial, 18 healthy individuals (10 females) orally received an individual amount of an isotonic sodium-chloride (ISO), Ringer (RIN), or glucose (GLU) solution.

[Changes in Children's Physical Fitness during Corona-Related Restrictions in Spring/Summer 2020].

Aim Of The Study: Due to the increasing spread of the coronavirus (SARS-CoV-2) and the accompanying containment measures, physical activity opportunities for children in the context of school and sport clubs were severely restricted in the spring/summer of 2020. The present study focuses on changes in children's physical fitness during this period.

Methods: We conducted an almost full census of 131 primary school children in the 2nd grade in Bad Dürkheim, assessing their physical fitness immediately before the school closures on 16 March 2020 and after the end of the summer holidays (end of August) in Rhine-land-Palatinate, Germany.