Dynamic Changes of Performance Fatigability and Muscular O-2 Saturation in a 4-km Cycling Time Trial

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MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniv Calgary-
Autor(es): dc.contributorUniversidade de São Paulo (USP)-
Autor(es): dc.contributorUniversidade Estadual Paulista (Unesp)-
Autor(es): dc.contributorUniv Lyon-
Autor(es): dc.contributorInst Univ France IUF-
Autor(es): dc.creatorAzevedo, Rafael A.-
Autor(es): dc.creatorMilioni, Fabio [UNESP]-
Autor(es): dc.creatorMurias, Juan M.-
Autor(es): dc.creatorBertuzzi, Romulo-
Autor(es): dc.creatorMillet, Guillaume Y.-
Data de aceite: dc.date.accessioned2022-02-22T00:58:19Z-
Data de disponibilização: dc.date.available2022-02-22T00:58:19Z-
Data de envio: dc.date.issued2021-06-25-
Data de envio: dc.date.issued2021-06-25-
Data de envio: dc.date.issued2021-03-01-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1249/MSS.0000000000002499-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/210030-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/210030-
Descrição: dc.descriptionExercise intensity variations throughout a cycling time trial (TT) might be influenced by subject's functional state. Purpose The current study characterized the performance fatigability etiology, immediately after exercise cessation, and its relation to the dynamic changes in muscle O-2 saturation (SmO2) at different TT phases. Methods Twelve males performed three separated TT of different distances, in a crossover counterbalanced design, until the end of the fast-start (FS, 827 +/- 135 m), even-pace (EP, 3590 +/- 66 m), or end-spurt (ES, 4000 m) TT phases. Performance fatigability was characterized by using isometric maximal voluntary contractions (IMVC), whereas the maximal voluntary activation (VA) and contractile function of knee extensors (e.g., peak torque of potentiated twitches [TwPt]) were evaluated using electrically evoked contractions performed before and immediately after each exercise bouts. SmO2, power output (PO), and EMG were also recorded. Results Immediately after the FS phase, there were lower values for IMVC (-23%), VA (-8%), and TwPt (-43%) (all P < 0.001), but no further changes were measured after EP (IMVC, -28%; VA, -8%; TwPt, -38%). After the ES phase, IMVC (-34%) and TwPt (-59%) further decreased compared with the previous phases (P < 0.05). There were lower SmO2 and higher EMG/PO values during FS and ES compared with EP phase. Conclusion FS and EP phases had similar performance fatigability etiology, but ES showed further impairments in contractile function. This later finding might be due to the abrupt changes in SmO2 and EMG/PO because of the high exercise intensity during the ES, which elicited maximal decline in contractile function at the finish line.-
Descrição: dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)-
Descrição: dc.descriptionEyes High Doctoral Recruitment Scholarship-
Descrição: dc.descriptionUniv Calgary, Fac Kinesiol, KNB 434,2500 Univ Dr NW, Calgary, AB T2N 1N4, Canada-
Descrição: dc.descriptionUniv Sao Paulo, Sch Phys Educ & Sport GEDAE USP, Endurance Performance Res Grp GEDAE USP, Sao Paulo, Brazil-
Descrição: dc.descriptionUNESP Univ Estadual Paulista, Fac Sci, Dept Phys Educ, Bauru, SP, Brazil-
Descrição: dc.descriptionUniv Lyon, Lab Interuniv Biol Motricite, UJM St Etienne, St Etienne, France-
Descrição: dc.descriptionInst Univ France IUF, Paris, France-
Descrição: dc.descriptionUNESP Univ Estadual Paulista, Fac Sci, Dept Phys Educ, Bauru, SP, Brazil-
Descrição: dc.descriptionFAPESP: 2017/22053-0-
Descrição: dc.descriptionFAPESP: 2016/26281-4-
Descrição: dc.descriptionFAPESP: 2016/02683-6-
Formato: dc.format613-623-
Idioma: dc.languageen-
Publicador: dc.publisherLippincott Williams & Wilkins-
Relação: dc.relationMedicine And Science In Sports And Exercise-
???dc.source???: dc.sourceWeb of Science-
Palavras-chave: dc.subjectCENTRAL FATIGUE-
Palavras-chave: dc.subjectEXERCISE PERFORMANCE-
Palavras-chave: dc.subjectNIRS-
Palavras-chave: dc.subjectOXYGEN AVAILABILITY-
Palavras-chave: dc.subjectPERIPHERAL FATIGUE-
Título: dc.titleDynamic Changes of Performance Fatigability and Muscular O-2 Saturation in a 4-km Cycling Time Trial-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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