Changes in lung function during exercise are independently mediated by increases in deep body temperature

Research output: Contribution to journalArticle

Original languageEnglish
Article numbere000210
JournalBMJ Open Sport & Exercise Medicine
Issue number1
Early online date2 Jun 2017
Publication statusE-pub ahead of print - 2 Jun 2017
Background: Exercise can induce a bronchodilatation. This study examined whether an increase in deep body temperature contributes to increases in ventilatory flow indicative of bronchodilatation.Method: The study employed a within-participant repeated measures design. Nine participants (mean [SD]: age 22 [3] years; height 177.7 [8.3] cm; mass 80.2 [19.1] kg) completed three test conditions: Exercise (EXERC; 30 minutes); 40 °C water immersion (IMM40; 30 minutes) to passively raise rectal temperature (Trec); and 35 °C immersion (IMM35; 30 minutes) a thermoneutral control for IMM40. All tests were followed by 10 minutes of seated rest in air. A forced vital capacity (FVC) manoeuvre was performed at the start of the test and every 10 minutes thereafter. Forced expiratory volume over 1 second [FEV1] FEV1/FVC, 25, 50 and 75 % maximal expiratory flow during FVC (FEF75, FEF50, FEF25) were also measured. Data were compared using ANOVA, 0.05 alpha level.Results: Rectal temperature (Trec) peaked after 30 minutes in the EXERC (mean [SD] 38.0 [0.3] °C) and IMM40 (38.2 [0.2] °C) conditions and were higher (P<0.05) than that those at the corresponding time in the thermoneutral condition (37.2 [0.2] °C). At this time FEV1 was 4.5 (0.6), 4.6 (0.3), and 4.4 (0.6) L respectively. Trec, FEV1, and FEV1/FVC were greater in the IMM40 and EXERC conditions compared to the IMM35 condition. Interaction effects were evident for FEF50 and FEF75 (P<0.05), being higher in IMM40 and EXERC conditions.Conclusion: Increasing deep body temperature, independently, contributes to the increased airflow ascribed to bronchodilatation when exercising.

    Research areas

  • Ventilation, bronchodilatation, exercise, body temperature, heat


  • e000210.full

    Rights statement: © Article author(s) (or their employer(s) unless otherwise stated in the text of the article) 2017. All rights reserved. No commercial use is permitted unless otherwise expressly granted. This is an Open Access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license.

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External organisations

  • HMS Nelson
  • Institute of Naval Medicine
  • University of Portsmouth

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