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Muscle oxygenation, EMG, and cardiovascular responses for cabin attendants vs. controls
Institute of Nutrition, Exercise and Sports, Faculty of Science, University of Copenhagen.
Institute of Nutrition, Exercise and Sports, Faculty of Science, University of Copenhagen.
University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences. University of Gävle, Centre for Musculoskeletal Research.
Institute of Nutrition, Exercise and Sports, Faculty of Science, University of Copenhagen.
2013 (English)In: Aviation, Space and Environmental Medicine, ISSN 0095-6562, E-ISSN 1943-4448, Vol. 84, no 5, 478-485 p.Article in journal (Refereed) Published
Abstract [en]

INTRODUCTION: The goal was to investigate the effect of acute moderate hypobaric exposure on the physiological responses to sustained contractions (local) and light to moderate dynamic exercise (systemic) for cabin attendants (CAB) and a matched control group (CON).

METHOD: There were 14 CAB and 13 CON who participated. The experimental protocol was designed as a 2 x 2 randomized crossover study for which subjects performed a forearm isometric test and a cycling test in normobaric (NORM) and hypobaric [HYPO; 574 mmHg approximately 8000 ft (2440 m) above sea level (ASL)] conditions. Oxygen saturation (StO2%) was measured in the extensor carpi radialis muscle at rest and during an isometric wrist extension (20% MVC). Heart rate (HR), ventilation (V(E)), and oxygen uptake (VO2) were measured at rest, during cycling exercise at intensities of 50 W and 100 W, and during recovery. Blood samples were collected and analyzed for hemoglobin concentrations.

RESULTS: Local response: There was a significant effect of HYPO for both CAB and CON with a decrease in StO2% of 6.5% both at rest and during contraction. Systemic response: there was no general effect of HYPO on HR, VE, or VO2. No differences were found between groups in either the local or systemic response or in the blood parameters.

CONCLUSION: This study shows an effect of moderate hypobaric exposure on local muscle oxygenation during rest and sustained contraction. Whether this has an impact on fatigue development during work among cabin attendants is discussed.

Place, publisher, year, edition, pages
2013. Vol. 84, no 5, 478-485 p.
Keyword [en]
hypoxia, hypobaric, NIRS, EMG, attendants
National Category
Environmental Health and Occupational Health
Identifiers
URN: urn:nbn:se:hig:diva-17327DOI: 10.3357/ASEM.3443.2013ISI: 000332996000004Scopus ID: 2-s2.0-84878557893OAI: oai:DiVA.org:hig-17327DiVA: diva2:736748
Available from: 2014-08-08 Created: 2014-08-08 Last updated: 2017-12-05Bibliographically approved

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