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BioMed Research International
Volume 2015, Article ID 618291, 4 pages
Research Article

Alterations in the Rate of Limb Movement Using a Lower Body Positive Pressure Treadmill Do Not Influence Respiratory Rate or Phase III Ventilation

Department of Biology, School of Exercise and Nutritional Sciences, San Diego State University, San Diego, CA 92182-7251, USA

Received 7 November 2014; Revised 16 December 2014; Accepted 22 December 2014

Academic Editor: Leonardo F. Ferreira

Copyright © 2015 Michael J. Buono et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The purpose of this study was to determine the effect of alterations in rate of limb movement on Phase III ventilation during exercise, independent of metabolic rate, gait style, and treadmill incline. Subjects completed five submaximal exercise bouts on a lower body positive pressure treadmill (AlterG P 200). The percent body weight for the five exercise bouts was 100, 87, 75, 63, and 50% and each was matched for carbon dioxide production (). Naturally, to match the while reducing the body weight up to 50% of normal required a significant increase in the treadmill speed from to mph, which resulted in a significant increase in the mean step frequency (steps per minute) from at 3 mph (i.e., 100% of body weight) to at 4.1 mph (i.e., 50% of body weight). The most important finding was that significant increases in step frequency did not significantly alter minute ventilation or respiratory rate. Such results do not support an important role for the rate of limb movement in Phase III ventilation during submaximal exercise, when metabolic rate, gait style, and treadmill incline are controlled.