title: Effect of induced alkalosis on perception of exertion during intermittent exercise.
abstract: The purpose of this study was to evaluate the effects of metabolic alkalosis on differentiated ratings of perceived exertion during intermittent high-intensity exercise. Six endurance-trained females participated as subjects in this investigation. Each subject underwent three separate experimental trials in which NaHCO3 was ingested in either a single (0.3 g NaHCO3/kg body wt) or periodic schedule (0.12 g NaHCO3/kg body wt initially, with 0.18 g/kg body wt distributed in equal doses before each 5-min exercise bout). Calcium carbonate served as a placebo control. An intermittent exercise protocol was used in which each subject rode a cycle ergometer at 90% maximum O2 consumption for 5 min. Within each acid-base condition, the exercise protocol was repeated three times with 10-min rest periods interspersed. Differentiated ratings of perceived exertion for the legs (RPE-L), chest (RPE-C), and overall body (RPE-O) were attenuated under alkalotic treatment relative to placebo control regardless of pattern of NaHCO3 administration. RPE-L, RPE-C, and RPE-O were negatively correlated to the bicarbonate concentration of venous blood. This investigation suggests that perception of effort during high-intensity intermittent exercise can be related to buffering capacity of the blood.
authors.affiliation: Exercise Physiology Laboratory, University of Louisville, Kentucky 40292.
authors.forename: A
authors.initials: A
authors.lastname: Swank
authors.forename: R J
authors.initials: RJ
authors.lastname: Robertson
mesh_terms: D000136:Acid-Base Equilibrium / Q000502:physiology*; D000704:Analysis of Variance; D001639:Bicarbonates; D004311:Double-Blind Method; D005080:Exercise Test; D005260:Female; D006439:Hemodynamics; D006801:Humans; D010101:Oxygen Consumption; D010465:Perception / Q000502:physiology*; D005082:Physical Exertion / Q000502:physiology*; D012129:Respiratory Function Tests; D012964:Sodium; D017693:Sodium Bicarbonate
chemical_list: D001639:Bicarbonates; D017693:Sodium Bicarbonate; D012964:Sodium