Preprint Brief Report Version 1 Preserved in Portico This version is not peer-reviewed

Proteinuria and significant dehydration in a short-steep triathlon: Preliminary report

Version 1 : Received: 20 September 2023 / Approved: 20 September 2023 / Online: 21 September 2023 (08:49:56 CEST)

How to cite: Rojas-Valverde, D.; Castro, C.; Bonilla, D. A.; Cardozo, L. A.; D. Gómez-Carmona, C. Proteinuria and significant dehydration in a short-steep triathlon: Preliminary report. Preprints 2023, 2023091421. https://doi.org/10.20944/preprints202309.1421.v1 Rojas-Valverde, D.; Castro, C.; Bonilla, D. A.; Cardozo, L. A.; D. Gómez-Carmona, C. Proteinuria and significant dehydration in a short-steep triathlon: Preliminary report. Preprints 2023, 2023091421. https://doi.org/10.20944/preprints202309.1421.v1

Abstract

Endurance triathlons impose substantial physiological stress, yet effects of short-course formats remain relatively unexplored. In this preliminary study, we assessed proteinuria and hydration levels in 27 well-trained triathletes (41.9 [7.4] years) who completed a sprint triathlon consisting of a 1500-m swim, 26-km cycle, and 8-km run. Urine samples were collected before and after the race. The results showed an increase in cases of post-race proteinuria from four to nine (p=0.03). Also, one case of urobilinuria and ketoacidosis was observed after the race. Pre-race glucosuria, which was present in nine cases, decreased to three cases post-race. Although hematuria cases decreased from six to two (p=0.13), pre-race leukocyturia (found in two cases) resolved post-race. There was a significant increase in urine specific gravity (from 1.018 to 1.023, p=0.03), indicating dehydration. In conclusion, short-course triathlons were found to induce post-race proteinuria, urobilinuria, and dehydration without exacerbating pre-race glucosuria, hematuria, or leukocyturia. These preliminary findings contribute to our understanding of medical guidelines for sprint triathlons, an area of endurance sports that has received limited research attention. Further investigation, both mechanistic and longitudinal, is warranted in this regard.

Keywords

Physical endurance; renal function; exercise-induce dehydration, athlete health, urinary biomarkers, physiological stress.

Subject

Medicine and Pharmacology, Anatomy and Physiology

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