Is lactate production related to muscular fatigue? A pedagogical proposition using empirical facts

dc.creatorMacedo, DV
dc.creatorLazarim, FL
dc.creatorda Silva, FOC
dc.creatorTessuti, LS
dc.creatorHohl, R
dc.date2009
dc.dateDEC
dc.date2014-11-19T22:46:38Z
dc.date2015-11-26T17:09:00Z
dc.date2014-11-19T22:46:38Z
dc.date2015-11-26T17:09:00Z
dc.date.accessioned2018-03-28T23:57:40Z
dc.date.available2018-03-28T23:57:40Z
dc.identifierAdvances In Physiology Education. Amer Physiological Soc, v. 33, n. 4, n. 302, n. 307, 2009.
dc.identifier1043-4046
dc.identifierWOS:000272152500014
dc.identifier10.1152/advan.00039.2009
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/60748
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/60748
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/60748
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1280517
dc.descriptionMacedo DV, Lazarim FL, Silva FOC, Tessuti LS, Hohl R. Is lactate production related to muscular fatigue? A pedagogical proposition using empirical facts. Adv Physiol Educ 33: 302-307, 2009; doi: 10.1152/advan.00039.2009.-The cause-effect relationship between lactic acid, acidosis, and muscle fatigue has been established in the literature. However, current experiments contradict this premise. Here, we describe an experiment developed by first-year university students planned to answer the following questions: 1) Which metabolic pathways of energy metabolism are responsible for meeting the high ATP demand during high-intensity intermittent exercise? 2) Which metabolic pathways are active during the pause, and how do they influence phosphocreatine synthesis? and 3) Is lactate production related to muscular fatigue? Along with these questions, students received a list of materials available for the experiment. In the classroom, they proposed two protocols of eight 30-m sprints at maximum speed, one protocol with pauses of 120 s and the other protocol with pauses of 20 s between sprints. Their performances were analyzed through the velocity registered by photocells. Blood lactate was analyzed before the first sprint and after the eighth sprint. Blood uric acid was analyzed before exercise and 15 and 60 min after exercises. When discussing the data, students concluded that phosphocreatine restoration is time dependent, and this fact influenced the steady level of performance in the protocol with pauses of 120 s compared with the performance decrease noted in the protocol with pauses of 20 s. As the blood lactate levels showed similar absolute increases after both exercises, the students concluded that lactate production is not related to the performance decrement. This activity allows students to integrate the understanding of muscular energy pathways and to reconsider a controversial concept with facts that challenge the universality of the hypothesis relating lactate production to muscular fatigue.
dc.description33
dc.description4
dc.description302
dc.description307
dc.languageen
dc.publisherAmer Physiological Soc
dc.publisherBethesda
dc.publisherEUA
dc.relationAdvances In Physiology Education
dc.relationAdv. Physiol. Educ.
dc.rightsfechado
dc.sourceWeb of Science
dc.subjectlactate
dc.subjectfatigue
dc.subjectacidosis
dc.subjectphysical exercise
dc.subjectteaching
dc.subjectIntensity Intermittent Exercise
dc.subjectInduced Metabolic-acidosis
dc.subjectExhaustive Exercise
dc.subjectLactic-acid
dc.subjectMuscle
dc.subjectRecovery
dc.subjectHumans
dc.titleIs lactate production related to muscular fatigue? A pedagogical proposition using empirical facts
dc.typeArtículos de revistas


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