The effect of inspiratory muscle fatigue on acid-base status and performance 3 during race-paced middle-distance swimming

Mitch Lomax, Nejc Kapus, Samuel Webb, Anton Ušaj

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Abstract

The aim of this study was to investigate the effect of pre-induced inspiratory muscle fatigue (IMF) on race-paced swimming and acid-base status. Twenty-one collegiate swimmers performed two discontinuous 400-m race-paced swims on separate days, with (IMF trial) and without (control trial) pre-induced IMF. Swimming characteristics, inspiratory and expiratory mouth pressures, and blood parameters were recorded. IMF and expiratory muscle fatigue (P < 0.05) were evident after both trials and swimming time was slower (P < 0.05) from 150-m following IMF inducement. Pre-induced IMF increased pH before the swim (P < 0.01) and reduced bicarbonate (P < 0.05) and the pressure of carbon dioxide (PCO2) (P < 0.05). pH (P < 0.05), bicarbonate (P < 0.01) and PCO2 (P < 0.05) were lower during swimming in the IMF trial. Blood lactate was similar before both trials (P > 0.05) but was higher (P < 0.01) in the IMF trial after swimming. Pre-induced IMF induced respiratory alkalosis, reduced bicarbonate buffering capacity and slowed swimming speed. Pre-induced and propulsion-induced IMF reflected metabolic acidosis arising from dual role breathing and propulsion muscle fatigue.
Original languageEnglish
Pages (from-to)1499-1505
Number of pages7
JournalJournal of Sports Sciences
Volume37
Issue number13
Early online date6 Feb 2019
DOIs
Publication statusPublished - 1 Jul 2019

Keywords

  • Inspiratory muscle fatigue,
  • swimming
  • acid-base status

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