Haemoconcentration, not decreased blood temperature, increases blood viscosity during cold water immersion
Rostomily KA, Jones DM, Pautz CM, Ito DW, Buono MJ
Diving and hyperbaric medicine · 7 citas
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- Diseño
- Ensayo clínico controlado (clasificado por nuestro filtro de IA)
- Estudiado en
- Personas
- Resultado principal
- Marcadores de salud y funcionamiento
Quién lo pagó
- Financiación
- Financiación no declarada
Publicación
- Publicado
- 2020-03-17 · Diving Hyperb Med · vol. 50 · número 1 · págs. 24–27
- Citado
- 19 citas · más que el 86% de estudios similares · 1.7× el promedio de su campo
- Referencias
- 16 trabajos
- Acceso
- Acceso abierto (copia en repositorio)
- Áreas de investigación
- Thermal Regulation in Medicine · Thermoregulation and physiological responses · Exercise and Physiological Responses
- Palabras clave
- Blood viscosity, Medicine, Hypothermia, Internal medicine, Animal science, Chemistry, Biology
- MeSH
- humans, hypothermia, water, body temperature, exercise, immersion, temperature, blood viscosity, female, male
5 autores
- Kaitlyn A. Rostomily🇺🇸San Diego State University
- Douglas M. Jones🇺🇸San Diego State University
- Carina M. Pautz🇺🇸San Diego State University
- Danica W. Ito🇺🇸San Diego State University
- Michael J. Buono🇺🇸San Diego State University
Resumen
El texto original del estudio, en el idioma en que se publicó.
Introduction
Prolonged cold-water immersion (CWI) has the potential to cause significant hypothermia and haemoconcentration; both of which have previously been shown to independently increase blood viscosity in vitro. The purpose of this study was to determine the effect of CWI on blood viscosity and examine the relative contribution of decreased blood temperature and haemoconcentration.
Methods
Ten healthy volunteers were immersed to mid-sternum in 10°C water for 90 minutes. Gastrointestinal (GI) temperature, haematocrit (Hct), and blood viscosity were measured pre- and post-CWI.
Results
CWI caused mean (SD) GI temperature to decrease from 37.5 (0.3)°C to 36.2 (0.7)°C (P < 0.05). CWI also caused mean Hct to increase from 40.0 (3.5)% to 45.0 (2.9)% (P < 0.05). As a result of the haemoconcentration and decreased GI temperature during CWI the mean blood viscosity increased by 19% from 2.80 (0.28) mPa·s⁻¹ to 3.33 (0.42) mPa·s⁻¹ (P < 0.05). However, when the pre-CWI blood sample was measured at the post-CWI GI temperature (36.2°C) there was no significant difference in the blood viscosity when compared to the pre-CWI (37.5°C) blood sample (2.82 (0.20) mPa·s-1 and 2.80 (0.28) mPa·s-1 respectively). Furthermore, the changes in Hct and blood viscosity during CWI were significantly correlated with an r = 0.84.
Conclusion
The results of the current study show that prolonged, severe CWI causes a significant 19% increase in blood viscosity. In addition, the results strongly suggest that almost all of the increased blood viscosity seen following CWI is the result of haemoconcentration, not decreased blood temperature.
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