title: Physiological responses at the lactate-minimum-intensity with and without prior high-intensity exercise.
abstract: This study examined the physiological responses during exercise-to-exhaustion at the lactate-minimum-intensity with and without prior high-intensity exercise. Eleven recreationally trained males performed a graded exercise test, a lactate minimum test and two constant-load tests at lactate-minimum-intensity until exhaustion, which were applied with or without prior hyperlactatemia induction (i.e., 30-s Wingate test). The physiological responses were significantly different (P < 0.05) between constant-load tests for pulmonary ventilation ([Formula: see text]), blood-lactate-concentration ([La(-)]), pH, bicarbonate concentration ([HCO3]) and partial pressure of carbon dioxide during the initial minutes. The comparisons within constant-load tests showed steady state behaviour for oxygen uptake and the respiratory exchange ratio, but heart rate and rating of perceived exertion increased significantly during both exercise conditions, while the [Formula: see text] increased only during constant-load effort. During effort performed after high-intensity exercise: [Formula: see text], [La(-)], pH and [HCO3] differed at the start of exercise compared to another condition but were similar at the end (P > 0.05). In conclusion, the constant-load exercises performed at lactate-minimum-intensity with or without prior high-intensity exercise did not lead to the steady state of all analysed parameters; however, variables such as [La(-)], pH and [HCO3] - altered at the beginning of effort performed after high-intensity exercise - were reestablished after approximately 30 min of exercise.
authors.affiliation: a Department of Physical Education , UNESP - Univ Estadual Paulista , Bauru , SP , Brazil.
authors.forename: Alessandro Moura
authors.initials: AM
authors.lastname: Zagatto
authors.affiliation: b University e-Campus , Novedrate , Italy.
authors.forename: Johnny
authors.initials: J
authors.lastname: Padulo
authors.affiliation: c School of Physical Education and Sports of Ribeirão Preto , University of São Paulo (USP) , Ribeirão Preto , SP , Brazil.
authors.forename: Adelino Ramos Sanchez da
authors.initials: AR
authors.lastname: Silva
authors.affiliation: d Laboratory of Respiratory Pathophysiology (LAFIR), Federal University of Mato Grosso do Sul (UFMS) , Campo Grande , MS , Brazil.
authors.forename: Paulo de Tarso Guerrero
authors.initials: Pde T
authors.lastname: Müller
authors.affiliation: e UNESP - Univ Estadual Paulista , Bauru , SP , Brazil, USA.
authors.forename: Willian Eiji
authors.initials: WE
authors.lastname: Miyagi
authors.affiliation: f School of Applied Sciences , Campinas State University (UNICAMP) , Limeira , SP , Brazil.
authors.forename: Claudio Alexandre
authors.initials: CA
authors.lastname: Gobatto
mesh_terms: D000328:Adult; D015308:Anaerobic Threshold / Q000502:physiology*; D002245:Carbon Dioxide / Q000097:blood; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test; D005221:Fatigue / Q000503:physiopathology*; D006339:Heart Rate; D006801:Humans; D065906:Hyperlactatemia / Q000209:etiology; D019344:Lactic Acid / Q000097:blood*; D008297:Male; D010101:Oxygen Consumption; D010313:Partial Pressure; D005082:Physical Exertion / Q000502:physiology*; D012123:Pulmonary Ventilation; D012146:Rest / Q000502:physiology*; D055815:Young Adult
chemical_list: D002245:Carbon Dioxide; D019344:Lactic Acid
keywords: Exercise physiology; kinetic of lactate; metabolic demand; oxygen uptake; workload