Airflow dynamics and exhaled-breath temperature following cold-water ingestion

Tiller, Nicholas B., Turner, Louise A ORCID: 0000-0002-0153-7075, Hart, John and Casaburi, Richard (2021) Airflow dynamics and exhaled-breath temperature following cold-water ingestion. Respiratory Physiology and Neurobiology, 284. Art 103564. doi:10.1016/j.resp.2020.103564

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Abstract

Drinking cold water evokes decreases in spirometric indices of lung function. We studied whether this could be explained by changes in exhaled-breath temperature (EBT), airflow dynamics, and spirometer measurement sensitivity. Methods In a randomized/crossover design, 10 healthy adults consumed 1000 mL refrigerated water (2.1 ± 0.64 °C) or water at room temperature (19.4 ± 0.5 °C), with EBT assessed at baseline and at 5, 10, 15 and 30-min post-ingestion. The influence of EBT on pneumotachograph measurement characteristics was modelled using computational fluid dynamics (CFD). Results At 5-min post-ingestion, EBT was lower (p < 0.001) following the ingestion of cold water versus water at room-temperature (31.7 ± 1.1 vs. 33.0 ± 0.9 °C), and remained lower until 30-min post-ingestion. At a flow of 8 L s―1, a decrease in EBT of 2.1 °C (as observed following cold-water ingestion) was modelled to underpredict lung volume by 0.7%. Conclusions Cold water reduces EBT below baseline but effects pneumotachograph measurements only negligibly. Therefore, decreased lung function following cold-water ingestion likely has a physiological explanation which warrants further study.

Item Type:	Article
Article Type:	Article
Uncontrolled Keywords:	Airflow; Lung function; Spirometry
Subjects:	Q Science > QP Physiology
Divisions:	Schools and Research Institutes > School of Education and Science
Research Priority Areas:	Health, Life Sciences, Sport and Wellbeing
Depositing User:	Rhiannon Goodland
Date Deposited:	04 Nov 2020 15:05
Last Modified:	31 Aug 2023 09:07
URI:	https://eprints.glos.ac.uk/id/eprint/8952

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