Physiological and perceptual responses to load-carrying in female subjects using internal and external frame backpacks

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Bibliographic Details
Title translated into German:Physiologische Reaktionen und Belastungswahrnehmung von Frauen beim Tragen von Lasten in Rucksaecken mit aeusserem oder integriertem Gestell
Author:Kirk, John; Schneider, Donald A.
Published in:Ergonomics
Published:35 (1992), 4 , S. 445-455, Lit.
Format: Publications (Database SPOLIT)
Publication Type: Journal article
Media type: Print resource
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Identification number:PU199207056503


11 females (18-33 yr) walked on a motor-driven treadmill at 86 m/min for 1 h carrying 33 of their BW in a backpack. Treadmill grade alternated every 15 min between 0 and 3. Each subject carried an internal frame backpack for one trial and an external frame backpack for another trial on a separate day. The variables measured during the two load-carrying experiments included oxygen consumption (VO2), heart rate (HR), respiratory exchange ratio (R), minute ventilation VE, and ratings of perceived exertion for chest (RPE-chest), shoulders (RPE-shoulders), and legs (RPE-legs). When VO2 measured during load-carrying was expressed as VO2max, the average values were 40,1 (63,5 HRmax) at 0 grade and 49,0 (69,6 HRmax) at 3 grade for both backpacks. No significant differences were found between the two packs for any of the metabolic, cardiorespiratory, or perceptual variables measured. Changes in treadmill grade had a significant effect on VO2, HR, and VE, regardless of the type of pack carried. VE was the only physiological response to load-carrying that increased significantly as exercise duration increased. The values for RPE-chest, RPE-shoulders, and RPE-legs were significantly increased by both exercise time and treadmill slope, regardless of backpack type. Thus despite relatively constant metabolic responses over time, increased RPE could compromise completion of the load-carrying task. It was concluded that differences in backpack frame design per se did not influence the physiological or perceptual reactions. Verf.-Referat