Prior Low- or High-Intensity Exercise Alters Pacing Strategy, Energy System Contribution and Performance during a 4-km Cycling Time Trial
Autor(a) principal: | |
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Data de Publicação: | 2014 |
Outros Autores: | , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNIFESP |
Texto Completo: | https://repositorio.unifesp.br/handle/11600/38335 https://dx.doi.org/10.1371/journal.pone.0110320 |
Resumo: | We analyzed the influence of prior exercise designed to reduce predominantly muscle glycogen in either type I or II fibers on pacing and performance during a 4-km cycling time trial (TT). After preliminary and familiarization trials, in a randomized, repeated-measures crossover design, ten amateur cyclists performed: 1) an exercise designed to reduce glycogen of type I muscle fibers, followed by a 4-km TT (EX-FIB I); 2) an exercise designed to reduce glycogen of type II muscle fibers, followed by a 4-km TT (EX-FIB II) and; 3) a 4-km TT, without the prior exercise (CONT). the muscle-glycogen-reducing exercise in both EX-FIB I and EX-FIB II was performed in the evening, similar to 12 h before the 4-km TT. Performance time was increased and power output (PO) was reduced in EX-FIB I (432.8 +/- 8.3 s and 204.9 +/- 10.9 W) and EX-FIB II (428.7 +/- 6.7 s and 207.5 +/- 9.1 W) compared to CONT (420.8 +/- 6.4 s and 218.4 +/- 9.3 W; P<0.01), without a difference between EX-FIB I and EX-FIB II (P>0.05). the PO was lower in EX-FIB I than in CONT at the beginning and middle of the trial (P<0.05). the mean aerobic contribution during EX-FIB I was also significantly lower than in CONT (P<0.05), but there was no difference between CONT and EX-FIB II or between EX-FIB I and EX-FIB II (P>0.05). the integrated electromyography was unchanged between conditions (P>0.05). Performance may have been impaired in EX-FIB I due a more conservative pacing at the beginning and middle, which was associated with a reduced aerobic contribution. in turn, the PO profile adopted in EX-FIB II was also reduced throughout the trial, but the impairment in performance may be attributed to a reduced glycolytic contribution (i.e. reduced lactate accumulation). |
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Correia-Oliveira, Carlos RafaellSantos, Ralmony de Alcantara [UNIFESP]Silva-Cavalcante, Marcos DavidBertuzzi, RomuloKiss, Maria Augusta Peduti Dal'MolinBishop, David JohnLima-Silva, Adriano EduardoUniversidade Federal de Pernambuco (UFPE)Universidade de São Paulo (USP)Universidade Federal de São Paulo (UNIFESP)Victoria Univ2016-01-24T14:38:01Z2016-01-24T14:38:01Z2014-10-20Plos One. San Francisco: Public Library Science, v. 9, n. 10, 9 p., 2014.1932-6203https://repositorio.unifesp.br/handle/11600/38335https://dx.doi.org/10.1371/journal.pone.0110320WOS000343942100053.pdf10.1371/journal.pone.0110320WOS:000343942100053We analyzed the influence of prior exercise designed to reduce predominantly muscle glycogen in either type I or II fibers on pacing and performance during a 4-km cycling time trial (TT). After preliminary and familiarization trials, in a randomized, repeated-measures crossover design, ten amateur cyclists performed: 1) an exercise designed to reduce glycogen of type I muscle fibers, followed by a 4-km TT (EX-FIB I); 2) an exercise designed to reduce glycogen of type II muscle fibers, followed by a 4-km TT (EX-FIB II) and; 3) a 4-km TT, without the prior exercise (CONT). the muscle-glycogen-reducing exercise in both EX-FIB I and EX-FIB II was performed in the evening, similar to 12 h before the 4-km TT. Performance time was increased and power output (PO) was reduced in EX-FIB I (432.8 +/- 8.3 s and 204.9 +/- 10.9 W) and EX-FIB II (428.7 +/- 6.7 s and 207.5 +/- 9.1 W) compared to CONT (420.8 +/- 6.4 s and 218.4 +/- 9.3 W; P<0.01), without a difference between EX-FIB I and EX-FIB II (P>0.05). the PO was lower in EX-FIB I than in CONT at the beginning and middle of the trial (P<0.05). the mean aerobic contribution during EX-FIB I was also significantly lower than in CONT (P<0.05), but there was no difference between CONT and EX-FIB II or between EX-FIB I and EX-FIB II (P>0.05). the integrated electromyography was unchanged between conditions (P>0.05). Performance may have been impaired in EX-FIB I due a more conservative pacing at the beginning and middle, which was associated with a reduced aerobic contribution. in turn, the PO profile adopted in EX-FIB II was also reduced throughout the trial, but the impairment in performance may be attributed to a reduced glycolytic contribution (i.e. reduced lactate accumulation).Foundation of Aids to Scientific Research of the State of Alagoas (FAPEAL)Univ Fed Pernambuco, CAV, Dept Phys Educ & Sports Sci, Sports Sci Res Grp, Vitoria de Santo Antao, Pernambuco, BrazilUniv São Paulo, Sch Phys Educ & Sport, Endurance Performance Res Grp, São Paulo, BrazilUniversidade Federal de São Paulo, Dept Med, Div Nephrol, São Paulo, BrazilVictoria Univ, Coll Sport & Exercise Sci, Inst Sport Exercise & Active Living, Melbourne, Vic 8001, AustraliaUniversidade Federal de São Paulo, Dept Med, Div Nephrol, São Paulo, BrazilWeb of Science9engPublic Library SciencePlos OnePrior Low- or High-Intensity Exercise Alters Pacing Strategy, Energy System Contribution and Performance during a 4-km Cycling Time Trialinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UNIFESPinstname:Universidade Federal de São Paulo (UNIFESP)instacron:UNIFESPORIGINALWOS000343942100053.pdfapplication/pdf533688${dspace.ui.url}/bitstream/11600/38335/1/WOS000343942100053.pdf7dde6f4bb4b8a17cc28f3a937e886892MD51open accessTEXTWOS000343942100053.pdf.txtWOS000343942100053.pdf.txtExtracted texttext/plain45782${dspace.ui.url}/bitstream/11600/38335/2/WOS000343942100053.pdf.txt928f1f23133026e5124a6234ed2c03c4MD52open access11600/383352023-08-01 13:58:19.749open accessoai:repositorio.unifesp.br:11600/38335Repositório InstitucionalPUBhttp://www.repositorio.unifesp.br/oai/requestopendoar:34652023-08-01T16:58:19Repositório Institucional da UNIFESP - Universidade Federal de São Paulo (UNIFESP)false |
dc.title.en.fl_str_mv |
Prior Low- or High-Intensity Exercise Alters Pacing Strategy, Energy System Contribution and Performance during a 4-km Cycling Time Trial |
title |
Prior Low- or High-Intensity Exercise Alters Pacing Strategy, Energy System Contribution and Performance during a 4-km Cycling Time Trial |
spellingShingle |
Prior Low- or High-Intensity Exercise Alters Pacing Strategy, Energy System Contribution and Performance during a 4-km Cycling Time Trial Correia-Oliveira, Carlos Rafaell |
title_short |
Prior Low- or High-Intensity Exercise Alters Pacing Strategy, Energy System Contribution and Performance during a 4-km Cycling Time Trial |
title_full |
Prior Low- or High-Intensity Exercise Alters Pacing Strategy, Energy System Contribution and Performance during a 4-km Cycling Time Trial |
title_fullStr |
Prior Low- or High-Intensity Exercise Alters Pacing Strategy, Energy System Contribution and Performance during a 4-km Cycling Time Trial |
title_full_unstemmed |
Prior Low- or High-Intensity Exercise Alters Pacing Strategy, Energy System Contribution and Performance during a 4-km Cycling Time Trial |
title_sort |
Prior Low- or High-Intensity Exercise Alters Pacing Strategy, Energy System Contribution and Performance during a 4-km Cycling Time Trial |
author |
Correia-Oliveira, Carlos Rafaell |
author_facet |
Correia-Oliveira, Carlos Rafaell Santos, Ralmony de Alcantara [UNIFESP] Silva-Cavalcante, Marcos David Bertuzzi, Romulo Kiss, Maria Augusta Peduti Dal'Molin Bishop, David John Lima-Silva, Adriano Eduardo |
author_role |
author |
author2 |
Santos, Ralmony de Alcantara [UNIFESP] Silva-Cavalcante, Marcos David Bertuzzi, Romulo Kiss, Maria Augusta Peduti Dal'Molin Bishop, David John Lima-Silva, Adriano Eduardo |
author2_role |
author author author author author author |
dc.contributor.institution.none.fl_str_mv |
Universidade Federal de Pernambuco (UFPE) Universidade de São Paulo (USP) Universidade Federal de São Paulo (UNIFESP) Victoria Univ |
dc.contributor.author.fl_str_mv |
Correia-Oliveira, Carlos Rafaell Santos, Ralmony de Alcantara [UNIFESP] Silva-Cavalcante, Marcos David Bertuzzi, Romulo Kiss, Maria Augusta Peduti Dal'Molin Bishop, David John Lima-Silva, Adriano Eduardo |
description |
We analyzed the influence of prior exercise designed to reduce predominantly muscle glycogen in either type I or II fibers on pacing and performance during a 4-km cycling time trial (TT). After preliminary and familiarization trials, in a randomized, repeated-measures crossover design, ten amateur cyclists performed: 1) an exercise designed to reduce glycogen of type I muscle fibers, followed by a 4-km TT (EX-FIB I); 2) an exercise designed to reduce glycogen of type II muscle fibers, followed by a 4-km TT (EX-FIB II) and; 3) a 4-km TT, without the prior exercise (CONT). the muscle-glycogen-reducing exercise in both EX-FIB I and EX-FIB II was performed in the evening, similar to 12 h before the 4-km TT. Performance time was increased and power output (PO) was reduced in EX-FIB I (432.8 +/- 8.3 s and 204.9 +/- 10.9 W) and EX-FIB II (428.7 +/- 6.7 s and 207.5 +/- 9.1 W) compared to CONT (420.8 +/- 6.4 s and 218.4 +/- 9.3 W; P<0.01), without a difference between EX-FIB I and EX-FIB II (P>0.05). the PO was lower in EX-FIB I than in CONT at the beginning and middle of the trial (P<0.05). the mean aerobic contribution during EX-FIB I was also significantly lower than in CONT (P<0.05), but there was no difference between CONT and EX-FIB II or between EX-FIB I and EX-FIB II (P>0.05). the integrated electromyography was unchanged between conditions (P>0.05). Performance may have been impaired in EX-FIB I due a more conservative pacing at the beginning and middle, which was associated with a reduced aerobic contribution. in turn, the PO profile adopted in EX-FIB II was also reduced throughout the trial, but the impairment in performance may be attributed to a reduced glycolytic contribution (i.e. reduced lactate accumulation). |
publishDate |
2014 |
dc.date.issued.fl_str_mv |
2014-10-20 |
dc.date.accessioned.fl_str_mv |
2016-01-24T14:38:01Z |
dc.date.available.fl_str_mv |
2016-01-24T14:38:01Z |
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.citation.fl_str_mv |
Plos One. San Francisco: Public Library Science, v. 9, n. 10, 9 p., 2014. |
dc.identifier.uri.fl_str_mv |
https://repositorio.unifesp.br/handle/11600/38335 https://dx.doi.org/10.1371/journal.pone.0110320 |
dc.identifier.issn.none.fl_str_mv |
1932-6203 |
dc.identifier.file.none.fl_str_mv |
WOS000343942100053.pdf |
dc.identifier.doi.none.fl_str_mv |
10.1371/journal.pone.0110320 |
dc.identifier.wos.none.fl_str_mv |
WOS:000343942100053 |
identifier_str_mv |
Plos One. San Francisco: Public Library Science, v. 9, n. 10, 9 p., 2014. 1932-6203 WOS000343942100053.pdf 10.1371/journal.pone.0110320 WOS:000343942100053 |
url |
https://repositorio.unifesp.br/handle/11600/38335 https://dx.doi.org/10.1371/journal.pone.0110320 |
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eng |
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Public Library Science |
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Public Library Science |
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