Blood lactate during submaximal exercises |
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Authors: | M Rieu J Miladi A Ferry A Duvallet |
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Institution: | (1) Laboratoire de Physiologie des Adaptations, Université Paris V, 24 rue du Faubourg Saint Jacques, F-75014 Paris, France |
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Abstract: | Summary Values of oxygen consumption, carbon dioxide production, ventilation and blood lactate concentration were determined in eight
active male subjects during the minute following submaximal square-wave exercise on a treadmill under two sets of conditions.
Square-wave exercise was (1) integrated in a series of intermittent incremental exercises of 4-min duration separated by 1-min
rest periods; (2) isolated, of 4- and 12-min duration, and of intensity corresponding to each of the intermittent incremental
periods of exercise. For square-wave exercise of the same duration (4 min) and intensity, no significant differences in the
above-mentioned parameters were noted between intermittent incremental exercise and isolated exercise. Only at high work rate
(>92% maximal oxygen uptake), were blood lactate levels in three subjects slightly higher after 12-min of isolated exercise
than after the 4-min periods of isolated exercise. Examination of these results suggests that (1) 80–90% of the blood lactate
concentration observed under our experimental conditions results from the accumulation of lactate in the blood during the
period of oxygen deficit; (2) therefore the blood lactate concentration/exercise intensity relationship, for the most part,
appears to represent the lactate accumulated early in the periods of intermittent incremental exercise. |
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Keywords: | Blood lactate Intermittent incremental exercise Isolated exercise Early lactate |
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