Dynamic Changes of Performance Fatigability and Muscular O-2 Saturation in a 4-km Cycling Time Trial
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1249/MSS.0000000000002499 http://hdl.handle.net/11449/210030 |
Resumo: | Exercise 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. |
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Dynamic Changes of Performance Fatigability and Muscular O-2 Saturation in a 4-km Cycling Time TrialCENTRAL FATIGUEEXERCISE PERFORMANCENIRSOXYGEN AVAILABILITYPERIPHERAL FATIGUEExercise 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.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Eyes High Doctoral Recruitment ScholarshipUniv Calgary, Fac Kinesiol, KNB 434,2500 Univ Dr NW, Calgary, AB T2N 1N4, CanadaUniv Sao Paulo, Sch Phys Educ & Sport GEDAE USP, Endurance Performance Res Grp GEDAE USP, Sao Paulo, BrazilUNESP Univ Estadual Paulista, Fac Sci, Dept Phys Educ, Bauru, SP, BrazilUniv Lyon, Lab Interuniv Biol Motricite, UJM St Etienne, St Etienne, FranceInst Univ France IUF, Paris, FranceUNESP Univ Estadual Paulista, Fac Sci, Dept Phys Educ, Bauru, SP, BrazilFAPESP: 2017/22053-0FAPESP: 2016/26281-4FAPESP: 2016/02683-6Lippincott Williams & WilkinsUniv CalgaryUniversidade de São Paulo (USP)Universidade Estadual Paulista (Unesp)Univ LyonInst Univ France IUFAzevedo, Rafael A.Milioni, Fabio [UNESP]Murias, Juan M.Bertuzzi, RomuloMillet, Guillaume Y.2021-06-25T12:37:24Z2021-06-25T12:37:24Z2021-03-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article613-623http://dx.doi.org/10.1249/MSS.0000000000002499Medicine And Science In Sports And Exercise. Philadelphia: Lippincott Williams & Wilkins, v. 53, n. 3, p. 613-623, 2021.0195-9131http://hdl.handle.net/11449/21003010.1249/MSS.0000000000002499WOS:000617875800018Web of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengMedicine And Science In Sports And Exerciseinfo:eu-repo/semantics/openAccess2024-04-24T18:52:57Zoai:repositorio.unesp.br:11449/210030Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-04-24T18:52:57Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Dynamic Changes of Performance Fatigability and Muscular O-2 Saturation in a 4-km Cycling Time Trial |
title |
Dynamic Changes of Performance Fatigability and Muscular O-2 Saturation in a 4-km Cycling Time Trial |
spellingShingle |
Dynamic Changes of Performance Fatigability and Muscular O-2 Saturation in a 4-km Cycling Time Trial Azevedo, Rafael A. CENTRAL FATIGUE EXERCISE PERFORMANCE NIRS OXYGEN AVAILABILITY PERIPHERAL FATIGUE |
title_short |
Dynamic Changes of Performance Fatigability and Muscular O-2 Saturation in a 4-km Cycling Time Trial |
title_full |
Dynamic Changes of Performance Fatigability and Muscular O-2 Saturation in a 4-km Cycling Time Trial |
title_fullStr |
Dynamic Changes of Performance Fatigability and Muscular O-2 Saturation in a 4-km Cycling Time Trial |
title_full_unstemmed |
Dynamic Changes of Performance Fatigability and Muscular O-2 Saturation in a 4-km Cycling Time Trial |
title_sort |
Dynamic Changes of Performance Fatigability and Muscular O-2 Saturation in a 4-km Cycling Time Trial |
author |
Azevedo, Rafael A. |
author_facet |
Azevedo, Rafael A. Milioni, Fabio [UNESP] Murias, Juan M. Bertuzzi, Romulo Millet, Guillaume Y. |
author_role |
author |
author2 |
Milioni, Fabio [UNESP] Murias, Juan M. Bertuzzi, Romulo Millet, Guillaume Y. |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
Univ Calgary Universidade de São Paulo (USP) Universidade Estadual Paulista (Unesp) Univ Lyon Inst Univ France IUF |
dc.contributor.author.fl_str_mv |
Azevedo, Rafael A. Milioni, Fabio [UNESP] Murias, Juan M. Bertuzzi, Romulo Millet, Guillaume Y. |
dc.subject.por.fl_str_mv |
CENTRAL FATIGUE EXERCISE PERFORMANCE NIRS OXYGEN AVAILABILITY PERIPHERAL FATIGUE |
topic |
CENTRAL FATIGUE EXERCISE PERFORMANCE NIRS OXYGEN AVAILABILITY PERIPHERAL FATIGUE |
description |
Exercise 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. |
publishDate |
2021 |
dc.date.none.fl_str_mv |
2021-06-25T12:37:24Z 2021-06-25T12:37:24Z 2021-03-01 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1249/MSS.0000000000002499 Medicine And Science In Sports And Exercise. Philadelphia: Lippincott Williams & Wilkins, v. 53, n. 3, p. 613-623, 2021. 0195-9131 http://hdl.handle.net/11449/210030 10.1249/MSS.0000000000002499 WOS:000617875800018 |
url |
http://dx.doi.org/10.1249/MSS.0000000000002499 http://hdl.handle.net/11449/210030 |
identifier_str_mv |
Medicine And Science In Sports And Exercise. Philadelphia: Lippincott Williams & Wilkins, v. 53, n. 3, p. 613-623, 2021. 0195-9131 10.1249/MSS.0000000000002499 WOS:000617875800018 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Medicine And Science In Sports And Exercise |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
613-623 |
dc.publisher.none.fl_str_mv |
Lippincott Williams & Wilkins |
publisher.none.fl_str_mv |
Lippincott Williams & Wilkins |
dc.source.none.fl_str_mv |
Web of Science reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1799964612109533184 |