Effect of heavy load carriage on respiratory mechanics and breathing pattern during graded exercise

  • Author / Creator
    Lesser, Iris Aline
  • The effect of heavy load carriage on pulmonary function at rest and on breathing pattern and lung volumes during graded exercise was studied. Fifteen males completed treadmill tests to measure VO2peak with and without a 25-kg pack. Subsequently, each subject completed short periods of treadmill walking in loaded and unloaded conditions at intensities equivalent to 55, 65, 75 and 85% of VO2peak. At rest, in the loaded condition, forced vital capacity (FVC) and forced expiratory volume in one second (FEV1) both were reduced by 3% with no change in FEV1/FVC. During exercise with the pack, tidal volume (VT) and end-inspiratory lung volume (EILV) were reduced by 14 and 5%, respectively, while ventilation (VE) was maintained by a 9% increase in breathing frequency (Bf). Rating of perceived exertion (RPE) was always higher during the loaded trial, despite identical oxygen consumption (VO2) and heart rate (HR) responses. During graded exercise under heavy load up to 85% of VO2peak, breathing pattern is altered to maintain VE while respiratory mechanics were not altered.

  • Subjects / Keywords
  • Graduation date
  • Type of Item
  • Degree
    Master of Science
  • DOI
  • License
    This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.
  • Language
  • Institution
    University of Alberta
  • Degree level
  • Department
    • Physical Education and Recreation
  • Supervisor / co-supervisor and their department(s)
    • Petersen, Stewart (Physical Education and Recreation)
  • Examining committee members and their departments
    • Hodges, Alastair (Physical Education and Recreation)
    • Stickland, Michael (Faculty of Medicine and Dentistry)