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Effect of voluntary hyperventilation on venous blood lactate during recovery from submaximal exercise

University of British Columbia

The purpose of this study was to determine whether a specified hypocapnia (27 mm Hg — end tidal PCO₂) induced by voluntary overbreathing would affect venous blood lactate decay, during recovery from submaximal exercise in humans. Eight students (male and female) volunteered for the 10-day study. Four students underwent experimental condition (A₁) first and four underwent experimental condition (A₂) first. The experimental condition (A₂) involved a four minute period of underbreathing after a four minute period of submaximal exercise on a bicycle ergometer. Experimental condition (A₁) involved a four minute period of overbreathing, immediately following a four minute period of submaximal exercise (70-80% of maximum). Three venous blood samples, for lactate analysis were drawn from the antecubital vein, one just prior to exercise and two at the 2nd and 4th minute, post exercise. Simultaneous micro-samples were obtained for pH determinations. Heart rate and respiratory values (infra red analyzer) were continuously monitored. Significantly lower recovery lactate values at two and four minutes were observed during overbreathing and while pH and heart rate were higher during overbreathing, they were not significantly changed by these treatment conditions at the .05 level.

Text

2010-02-18

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http://hdl.handle.net/2429/20399

Physical Education

University of British Columbia

Graduate