Performance Benefits of Rehydration with Intravenous Fluid and Oral Glycerol

Abstract

Combining IV fluid with oral glycerol resulted in the greatest fluid retention; however, it did not improve exercise performance compared with either modality alone.

Hydration and endocrine responses to intravenous fluid and oral glycerol

“…There were no between‐trial differences in pretrial nutritional dietary intakes (van Rosendal et al., ).…”

“…The performance aspects of the study have been presented in another manuscript (van Rosendal et al., ) and are therefore not described in detail here. The performance test itself was conducted as described in the familiarization trial.…”

“…It was hypothesized that: (a) combining IV rehydration with oral glycerol would result in the greatest fluid retention of the four protocols; (b) glycerol would reduce urine output relative to the same trial without glycerol; and (c) the enhanced hydration in IV trials would be associated with lower aldosterone, antidiuretic hormone (ADH), and cortisol concentrations. The effects of these rehydration regimes on subsequent exercise performance have been reported elsewhere (van Rosendal et al., ). Performance was significantly ( P < 0.05) improved when rehydrating with oral glycerol (improved time to complete 40 km time trial by 3.7%), IV (3.5%), and IV with oral glycerol (4.1%), compared with the oral rehydration trial (van Rosendal et al., ).…”

“…The effects of these rehydration regimes on subsequent exercise performance have been reported elsewhere (van Rosendal et al., ). Performance was significantly ( P < 0.05) improved when rehydrating with oral glycerol (improved time to complete 40 km time trial by 3.7%), IV (3.5%), and IV with oral glycerol (4.1%), compared with the oral rehydration trial (van Rosendal et al., ).…”

Annual banned‐substance review: analytical approaches in human sports drug testing

“…[125] The analysis of the extract is subsequently conducted on a C-18 column (1 x 50 mm, particle size 3.5 μm) interfaced via ESI to a QqQ analyzer, allowing for detection limits for desmopressin of 25 pg/mL. [126,127] Stimulants Within the class of stimulating agents, particularly methylhexaneamine (1,3-dimethylamylamine, DMAA) has been subject of much discussion and research recently, mostly concerning the question as to its natural or non-natural origin and the more than 300 AAFs as recorded in 2012. Further, glycerol is listed among the masking agents as a compound potentially affecting the plasma volume.…”