Lactate responses during multiple bouts of exercise with active and passive recovery

Cardiovascular and metabolic responses were measured during multiple bouts of exercise with active and passive recovery modes. Five-well trained cyclists and 2 well trained biathletes performed a maximal oxygen uptake test and two interval tests on a cycle ergometer; each test was separated by at least 72 hours. The intervals consisted of 12 one-minute exercise bouts separated by a one-minute recovery period. One interval test required passive recovery (no pedaling), while active recovery at 40% VO_2max was used during the other interval session. The work bouts during the interval sessions required 80 pedal revolutions per minute at a work rate equal to 100% of each subjects' VO_2max. Blood samples for lactate analysis were obtained at rest and after the 3rd, 6th, 9th, and 12th intervals. Ratings of perceived exertion (RPE) were taken during the 3rd, 6th, 9th, and 12th intervals. Heart rate (HR) and oxygen uptake (VO₂) were recorded every minute throughout the interval tests. A repeated measures ANOVA was used to analyze the data. Lactate concentrations, RPE, body weight, and CHO intake were not significantly different between treatments. However, VO₂ and HR values were significantly higher (p<.05) during the active recovery test. These data suggest that lactate values and RPE are not iv affected by the mode of recovery, while active recovery will result in an increased VO₂ and HR.