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European Journal of Applied Physiology

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01-02-2019 | Original Article

Pulmonary and respiratory muscle function in response to 10 marathons in 10 days

Authors: Nicholas B. Tiller, Louise A. Turner, Bryan J. Taylor

Published in: European Journal of Applied Physiology | Issue 2/2019

Abstract

Purpose

Marathon and ultramarathon provoke respiratory muscle fatigue and pulmonary dysfunction; nevertheless, it is unknown how the respiratory system responds to multiple, consecutive days of endurance exercise.

Methods

Nine trained individuals (six male) contested 10 marathons in 10 consecutive days. Respiratory muscle strength (maximum static inspiratory and expiratory mouth-pressures), pulmonary function (spirometry), perceptual ratings of respiratory muscle soreness (Visual Analogue Scale), breathlessness (dyspnea, modified Borg CR10 scale), and symptoms of Upper Respiratory Tract Infection (URTI), were assessed before and after marathons on days 1, 4, 7, and 10.

Results

Group mean time for 10 marathons was 276 ± 35 min. Relative to pre-challenge baseline (159 ± 32 cmH₂O), MEP was reduced after day 1 (136 ± 31 cmH₂O, p = 0.017), day 7 (138 ± 42 cmH₂O, p = 0.035), and day 10 (130 ± 41 cmH₂O, p = 0.008). There was no change in pre-marathon MEP across days 1, 4, 7, or 10 (p > 0.05). Pre-marathon forced vital capacity was significantly diminished at day 4 (4.74 ± 1.09 versus 4.56 ± 1.09 L, p = 0.035), remaining below baseline at day 7 (p = 0.045) and day 10 (p = 0.015). There were no changes in FEV₁, FEV₁/FVC, PEF, MIP, or respiratory perceptions during the course of the challenge (p > 0.05). In the 15-day post-challenge period, 5/9 (56%) runners reported symptoms of URTI, relative to 1/9 (11%) pre-challenge.

Conclusions

Single-stage marathon provokes acute expiratory muscle fatigue which may have implications for health and/or performance, but 10 consecutive days of marathon running does not elicit cumulative (chronic) changes in respiratory function or perceptions of dyspnea. These data allude to the robustness of the healthy respiratory system.

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Title: Pulmonary and respiratory muscle function in response to 10 marathons in 10 days
Authors: Nicholas B. Tiller
Louise A. Turner
Bryan J. Taylor
Publication date: 01-02-2019
Publisher: Springer Berlin Heidelberg
Published in: European Journal of Applied Physiology / Issue 2/2019
Print ISSN: 1439-6319
Electronic ISSN: 1439-6327
DOI: https://doi.org/10.1007/s00421-018-4037-2

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Pulmonary and respiratory muscle function in response to 10 marathons in 10 days

Abstract

Purpose

Methods

Results

Conclusions

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Purpose

Methods

Results

Conclusions

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