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Lung function responses to cold water ingestion: A randomised controlled crossover trial.

Louise A Turner¹, Nicholas B Tiller²

¹School of Sport and Exercise, University of Gloucestershire, Gloucester, UK.

Respiratory Physiology & Neurobiology

|September 13, 2023

Summary

Drinking cold water, especially large volumes, can temporarily reduce lung function measurements like forced vital capacity (FVC) and forced expiratory volume in 1 second (FEV1). Avoid cold beverages before spirometry tests for accurate results.

Keywords:

Beverage Cold drink Lung function Pulmonary function

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Area of Science:

Physiology
Respiratory Medicine
Sports Science

Background:

Accurate lung function testing is crucial for diagnosing and monitoring respiratory conditions.
Factors influencing spirometry measurements require careful consideration to avoid confounding results.
The impact of ingested fluid temperature and volume on pulmonary function has not been extensively studied.

Purpose of the Study:

To investigate the hypothesis that cold water ingestion affects lung function measurements.
To determine if temperature and volume of ingested water mediate changes in spirometry.
To provide recommendations for pre-test hydration protocols.

Main Methods:

A randomized crossover trial involving 10 healthy adults.
Spirometry was performed before and at multiple time points after consuming 500 mL or 1000 mL of cold (2°C) or room-temperature (18°C) water.
Comparison of forced vital capacity (FVC) and forced expiratory volume in 1 second (FEV1) values.

Main Results:

Ingesting 1000 mL of cold water significantly reduced FVC for at least 10 minutes and FEV1 for at least 15 minutes.
Ingesting 500 mL of cold water reduced FEV1 for 5 minutes.
Water at room temperature did not influence lung function parameters.

Conclusions:

Cold water ingestion, particularly in larger volumes, can temporarily impair lung function.
To ensure accurate spirometry, avoid consuming cold beverages immediately before testing.
Hydration guidelines for pulmonary function tests should consider fluid temperature and volume.