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Interaction Between Ambient Temperature, Hypoxia, and Load Carriage on Respiratory Muscle Fatigue

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)952-960
Number of pages9
JournalAerospace Medicine and Human Performance
Volume89
Issue number11
DOIs
StatePublished - 1 Nov 2018
BACKGROUND: While respiratory muscle fatigue is present following load carriage activity at sea level, the effect of environmental conditions on respiratory strength while undertaking load carriage is unknown.METHODS: The effect of thoracic load carriage during walks (5.5 km) in four environments [(thermo-neutral sea level (SL), -10°C (C), 4300 m (H) and 4300 m at -10°C (HC)] was evaluated on respiratory muscle fatigue. Ten subjects completed eight self-paced randomized treadmill walks comprising a variety of gradients, unloaded and loaded (18.2 kg), across the four environments. Respiratory muscle strength was measured via maximal inspiratory pressure (PImax) and expiratory pressure (PEmax) assessments.RESULTS: Submaximal walking in HC elicited respiratory muscle fatigue when compared to SL. Inspiratory muscle fatigue was independent of load. The relative change in PImax from baseline was significantly greater in HC compared to SL (9.6% vs. 1.3%). PEmax showed a significant reduction during HC (-22.3 cmH₂O, -14.4%) when compared to the other three environments.CONCLUSION: These results highlight the need to focus on respiratory muscle strength in preparation for exercise in cold hypoxic conditions.Hinde K, Low C, Lloyd R, Cooke C. Interaction between ambient temperature, hypoxia, and load carriage on respiratory muscle fatigue. Aerosp Med Hum Perform. 2018; 89(11):952-960.

    Research areas

  • cold, hypoxia, load carriage

Related faculties, schools or groups

External organisations

  • Leeds Beckett University

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