title: Alterations in the rate of limb movement using a lower body positive pressure treadmill do not influence respiratory rate or phase III ventilation.
abstract: 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 (V CO2 ). Naturally, to match the V CO2 while reducing the body weight up to 50% of normal required a significant increase in the treadmill speed from 3.0 ± 0.1 to 4.1 ± 0.2 mph, which resulted in a significant (P < 0.05) increase in the mean step frequency (steps per minute) from 118 ± 10 at 3 mph (i.e., 100% of body weight) to 133 ± 6 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.
authors: Department of Biology, School of Exercise and Nutritional Sciences, San Diego State University, San Diego, CA 92182-7251, USA.
authors: Michael J
authors: MJ
authors: Buono
authors: Department of Biology, School of Exercise and Nutritional Sciences, San Diego State University, San Diego, CA 92182-7251, USA.
authors: Marissa
authors: M
authors: Burnsed-Torres
authors: Department of Biology, School of Exercise and Nutritional Sciences, San Diego State University, San Diego, CA 92182-7251, USA.
authors: Bethany
authors: B
authors: Hess
authors: Department of Biology, School of Exercise and Nutritional Sciences, San Diego State University, San Diego, CA 92182-7251, USA.
authors: Kristine
authors: K
authors: Lopez
authors: Department of Biology, School of Exercise and Nutritional Sciences, San Diego State University, San Diego, CA 92182-7251, USA.
authors: Catherine
authors: C
authors: Ortiz
authors: Department of Biology, School of Exercise and Nutritional Sciences, San Diego State University, San Diego, CA 92182-7251, USA.
authors: Ariel
authors: A
authors: Girodo
authors: Department of Biology, School of Exercise and Nutritional Sciences, San Diego State University, San Diego, CA 92182-7251, USA.
authors: Karen
authors: K
authors: Lolli
authors: Department of Biology, School of Exercise and Nutritional Sciences, San Diego State University, San Diego, CA 92182-7251, USA.
authors: Brett
authors: B
authors: Bloom
authors: Department of Biology, School of Exercise and Nutritional Sciences, San Diego State University, San Diego, CA 92182-7251, USA.
authors: David
authors: D
authors: Bailey
authors: Department of Biology, School of Exercise and Nutritional Sciences, San Diego State University, San Diego, CA 92182-7251, USA.
authors: Fred W
authors: FW
authors: Kolkhorst
mesh_terms: D000328:Adult; D001835:Body Weight; D015444:Exercise / Q000502:physiology; D005080:Exercise Test / Q000379:methods*; D005260:Female; D006801:Humans; D007866:Leg / Q000502:physiology*; D008297:Male; D009068:Movement / Q000502:physiology*; D012119:Respiration; D056152:Respiratory Rate / Q000502:physiology*
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