title: Blood lactate during submaximal exercises. Comparison between intermittent incremental exercises and isolated exercises.
abstract: 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 (greater than 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.
authors.affiliation: Laboratoire de Physiologie des Adaptations, Université Paris V, France.
authors.forename: M
authors.initials: M
authors.lastname: Rieu
authors.forename: J
authors.initials: J
authors.lastname: Miladi
authors.forename: A
authors.initials: A
authors.lastname: Ferry
authors.forename: A
authors.initials: A
authors.lastname: Duvallet
mesh_terms: D000328:Adult; D015444:Exercise / Q000502:physiology*; D006801:Humans; D007773:Lactates / Q000097:blood*; D008297:Male; D010101:Oxygen Consumption; D012420:Running; D013223:Statistics as Topic; D013997:Time Factors
chemical_list: D007773:Lactates